**POLAR Spacecraft Status As of: Tues, 03 June 03 16:00 EST**

*(changes from last week in bold border)*

+----------+--------+--------+--------+--------+---------+---------+
| **Subs   | ##     | **NOAA | **NOAA | **NOAA | **NOA   | ##### N |
| ystem/** | ### NO | -12D** | -14J** | -15K** | A-16L** | OAA-17M |
|          | AA-11H |        |        |        |         |         |
| **Com    |        | S      | S      | BACKUP | PRIMARY | PRIMARY |
| ponent** | S      | tandby | tandby | AM     | PM      | AM      |
|          | tandby | AM     | AM     |        |         |         |
|          | PM     |        |        | GAC    | GAC&LAC | GAC&LAC |
|          |        | STIP   | STIP   | data   | data    | data    |
|          | STIP   | data   | data   | only   |         |         |
|          | data   | only   | only   |        |         |         |
|          | only   |        |        |        |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| **LA     | 09     | 05     | 12     | 05     | 0       | 6/24/02 |
| UNCHED** | /23/88 | /14/91 | /30/94 | /13/98 | 9/21/00 |         |
+----------+--------+--------+--------+--------+---------+---------+
| **CNTL   | OBP2   | OBP2   | OBP2   | OBP2   | OBP2    | OBP2    |
| OBP**    |        |        |        |        |         |         |
|          |        |        | OBP1   | since  | Analog  |         |
|          |        |        | inope  | 4      | telem   |         |
|          |        |        | rative | /24/03 | d       |         |
|          |        |        |        |        | rifting |         |
+----------+--------+--------+--------+--------+---------+---------+
| **BUS**  | A-BUS  | B-BUS  | B-BUS  | B-BUS  | B-BUS   | B-BUS   |
|          |        |        |        |        |         |         |
|          | XSU-1  | XSU-1  | XSU-2  | XSU-1  | XSU-1   | XSU-1   |
|          |        |        |        |        |         |         |
|          |        |        | XSU-1  |        |         |         |
|          |        |        | inope  |        |         |         |
|          |        |        | rative |        |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| **BUS    | NO     | NO     | NO     | NO     | NO      | NO      |
| VETO**   |        |        |        |        |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| *        | DE     | N      | N      | OK     | NOMINAL | NOMINAL |
| *ADACS** | GRADED | OMINAL | OMINAL |        |         |         |
|          |        |        |        | Rg     | R       | R       |
|          | (Y, Z- | RG     | Rgm    | mode=M | gmode=D | gmode=D |
|          | Gyros  | mode=M | ode=Di | onitor | isabled | isabled |
|          | F      | onitor | sabled |        |         |         |
|          | ailed) | Normal |        | Normal | Normal  | Rwheel  |
|          | R      | mode   | SS     | mode   | Mode    | auto    |
|          | educed |        | check  |        |         | swap    |
|          | Gyro   |        | Di     | Gyro-3 | Gyro-3  | from X  |
|          | S/W    |        | sabled | Off    | invest  | to S    |
|          |        |        | when   |        | igation | while   |
|          |        |        | mo     |        |         | in YGC  |
|          |        |        | de=YGC |        | Gyro    | mode on |
|          |        |        |        |        | ch      | 6/1.    |
|          |        |        |        |        | annel-B | Mode    |
|          |        |        |        |        | invest  | co      |
|          |        |        |        |        | igation | mmanded |
|          |        |        |        |        |         | back to |
|          |        |        |        |        |         | normal  |
|          |        |        |        |        |         | 6/1,    |
|          |        |        |        |        |         | wheel   |
|          |        |        |        |        |         | co      |
|          |        |        |        |        |         | mmanded |
|          |        |        |        |        |         | back to |
|          |        |        |        |        |         | X on    |
|          |        |        |        |        |         | 6/2     |
+----------+--------+--------+--------+--------+---------+---------+
| **RXO**  | PRI    | PRI    | PRI    | PRI    | PRI     | PRI     |
|          |        |        |        |        |         |         |
|          | BU     | BU     | BU     | ETCUP  | ETCUP   | ETCUP   |
|          | random | random | random | -8     | --5.1   | -1 msec |
|          | e      | e      | e      | mSec   | mSec    |         |
|          | nables | nables | nables |        |         | Update  |
|          |        |        | ETCUP  | Update | Update  | of      |
|          | ETCUP  | Update | --7.3  | of     | of      | --100   |
|          | +70    | of     | Msec   | +100   | --100   | ms      |
|          | mSecs  | +1250  |        | ms     | ms      | planned |
|          |        | ms     | Update | plan   | planned | for     |
|          |        | plan   | of     | for    | for     | 6/10    |
|          |        | for    | --150  | 6/10   | 6/10    |         |
|          |        | 6/6    | ms     |        |         |         |
|          |        |        | p      |        |         |         |
|          |        |        | lanned |        |         |         |
|          |        |        | for    |        |         |         |
|          |        |        | 6/10   |        |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| **CLOCK  | 2      | 2      | 2      | 2      | 2       | 2       |
| DIV**    |        |        |        |        |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| **MIRP** | ON     | ON     | ON     | ON     | ON      | ON      |
|          |        |        |        |        |         |         |
|          |        |        | Ex     | Ex     | E       | I       |
|          |        |        | ternal | ternal | xternal | nternal |
|          |        |        | Sync.  | Sync,  | Sync,   | Synch   |
|          |        |        |        | R      |         |         |
|          |        |        | R      | ephase | Rephase | Rephase |
|          |        |        | ephase | Di     | Enabled | Enabled |
|          |        |        | D      | sable. |         |         |
|          |        |        | isable |        |         |         |
|          |        |        |        | Re     |         |         |
|          |        |        | Re     | phased |         |         |
|          |        |        | phased | Daily  |         |         |
|          |        |        | Daily  |        |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| **TIP    | 1      | 1      | 1      | 2      | 1       | 1       |
| SIDE**   |        |        |        |        |         |         |
|          |        |        |        | ####   |         |         |
|          |        |        |        | #### S |         |         |
|          |        |        |        | ince 4 |         |         |
|          |        |        |        | /24/03 |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| **DTRs** | 1A,    | 1, 3,  | 1, 2B, | 1, 2,  | 1       | 1,2,3,4 |
|          | 2B, 3, | 4, 5B  | 3A, 5  | 3, 4   | ,2,3,4A |         |
|          | 4A     |        | Safe   | Saf    |         | Safes   |
|          | Safes  | Safe   | state- | estate | Sa      | tate=1B |
|          | tate - | state- | 1B     | 1B EOT | festate |         |
|          | 2B,    | 1B     |        |        | 3A      | D       |
|          |        |        |        |        |         | TR2-SSR |
|          |        |        |        |        | 4B TOAR |         |
|          |        |        |        |        | 418     | DTR5    |
|          |        |        |        |        |         | TOAR    |
|          |        |        |        |        | (STIP   | 420     |
|          |        |        |        |        | only)   |         |
+----------+--------+--------+--------+--------+---------+---------+
| **VTX**  | OFF    | 1      | OFF    | 1      | OFF     | 2       |
|          |        |        |        |        |         |         |
|          |        | since  | Since  |        | Inop    |         |
|          |        | 4      | 8      |        | since   |         |
|          |        | /20/03 | /14/02 |        | 1       |         |
|          |        |        |        |        | 1/15/00 |         |
+----------+--------+--------+--------+--------+---------+---------+
| **BTX**  | 2      | 1      | 2      | 1      | 1       | ####    |
|          |        |        |        |        |         | ###  2  |
+----------+--------+--------+--------+--------+---------+---------+
| **STX**  | 3 --   | 1 --   | 3 --   | 1, 2,  | 1 --    | 3 --    |
|          | TIP    | HRPT;  | HRPT   | 3 -    | HRPT;   | HRPT    |
|          |        |        |        | deg    |         | 1&2     |
|          | 1,2 -  | 2,3 -  | 2, 1   | raded; | 2--     | P       |
|          | Pl     | Pl     | --     |        | Pl      | layback |
|          | ayback | ayback | Pl     | ###    | ayback; |         |
|          |        |        | ayback | ### 2  |         | 4 --    |
|          |        |        |        | Omni-- | 4 --    | TIP     |
|          |        |        |        | HRPT;  | P       |         |
|          |        |        |        | 4- Pla | layback | STX 3   |
|          |        |        |        | yback  |         | TOAR    |
|          |        |        |        |        | 3       | 424     |
|          |        |        |        |        | \--D    |         |
|          |        |        |        |        | egraded | STX 4   |
|          |        |        |        |        |         | TOAR    |
|          |        |        |        |        |         | 423     |
+----------+--------+--------+--------+--------+---------+---------+
| #        | [Array | [Array | [Array | [Array | [Array  | [Array  |
| ## POWER | Off    | Off    | Off    | Off    | Off     | Off.    |
|          | -30°]  | 0°]    | -55°]  | -45°]  | -40     | --3     |
| (Array   | {.unde | {.unde | {.unde | {.unde | °]{.und | 5]{.und |
| offset,  | rline} | rline} | rline} | rline} | erline} | erline} |
| charge   |        |        |        |        |         |         |
| and      | Since  | E      | Since  | Since  | Since   | Since   |
| eclipse  | 6      | clipse | 4      | 1      | 7/16/02 | 7/1/02  |
| states,  | /19/02 | Season | /29/02 | /25/01 |         |         |
| sun      |        |        |        |        | Eclipse | Eclipse |
| angle)   | E      | Peaks  | Sun    | Sun    | all     | all     |
|          | clipse | 22 Jun | Angle  | Angle  | year    | year    |
|          | all    | 03     | at 35  | at 35  |         |         |
|          | year   |        |        | Topped | Sun     | Sun     |
|          |        | Sun    | U      | out,   | Angle   | Angle   |
|          | Sun    | Angle  | ptrend | steady | 66      | at 70   |
|          | angle  | at 37  | to 36  | trend  |         | Steady  |
|          | 79     | U      |        |        | UpTrend | Trend   |
|          |        | ptrend | Batt   | B      | to 68   |         |
|          | Steady | to 38  | C      | attery | on 6/15 | Batts   |
|          | Trend  | in     | harge= | C      |         | 1-3=    |
|          |        | mi     | LRC    | harges | Batt2A  | LRC     |
|          | B      | d-June |        | LOW    | TOAR    |         |
|          | attery |        | V/     | RATE   | 403     | V/T=4/8 |
|          | 1& 2   | B      | T=8/11 | 10/22  |         |         |
|          | Charge | attery |        |        | Batts   | TOAR    |
|          | Rate   | C      | E      | V      | 1-3=    | 416 on  |
|          | to MRC | harges | clipse | /T=7/9 | LRC     | Batt2A  |
|          | 5/30   | LOW    | Season |        |         | temp    |
|          | for    | RATE   |        | E      | V/T=4/8 |         |
|          | 5/31   | 10/22  | Peaks  | clipse |         |         |
|          | ec     |        | 6/20   | Season |         |         |
|          | lipse. | V/T=4  |        |        |         |         |
|          | Back   |        | Shunt  | Peaks  |         |         |
|          | to LRC |        | Degra  | 6/15   |         |         |
|          | 6/3    |        | dation |        |         |         |
|          |        |        | TOAR   |        |         |         |
|          | Batt3= |        | 425    |        |         |         |
|          | LRC    |        |        |        |         |         |
|          |        |        |        |        |         |         |
|          | VT1    |        |        |        |         |         |
|          | ,2=6/8 |        |        |        |         |         |
|          |        |        |        |        |         |         |
|          | VT3 =  |        |        |        |         |         |
|          | 8/11   |        |        |        |         |         |
|          |        |        |        |        |         |         |
|          | Charge |        |        |        |         |         |
|          | state  |        |        |        |         |         |
|          | safe   |        |        |        |         |         |
|          |        |        |        |        |         |         |
|          | trip   |        |        |        |         |         |
|          | di     |        |        |        |         |         |
|          | sabled |        |        |        |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| *        | OFF    | ON     | ON     | ON     | ON      | ### ON  |
| *AVHRR** |        |        |        |        |         |         |
|          | Failed | N      | Scan   | Occa   | Nominal | Nominal |
|          | Power  | ominal | Motor  | sional | (3B)    | (3A&B)  |
|          | Supply |        | de     | Scan   |         |         |
|          |        |        | graded | motor  | 3A-B    | 3A-B    |
|          |        |        | 5/1/03 | s      | switch  | switch  |
|          |        |        | STAT   | urges. | d       | enabled |
|          |        |        | US=RED | Last   | isabled |         |
|          |        |        |        |        |         |         |
|          |        |        |        | inc    |         |         |
|          |        |        |        | ident, |         |         |
|          |        |        |        | 3      |         |         |
|          |        |        |        | /30/02 |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| **A      |        |        |        | ON     | ON      | ON      |
| MSU-A1** |        |        |        |        |         |         |
|          |        |        |        | Ch14   | TOAR    | TOAR    |
|          |        |        |        | inope  | 415 on  | 413     |
|          |        |        |        | rative | primary | Chan-3  |
|          |        |        |        |        | PLLO    | popcorn |
|          |        |        |        | Ch11   | chans   | noise   |
|          |        |        |        | inope  | 9-14    |         |
|          |        |        |        | rative | bias    | TOAR    |
|          |        |        |        |        | shift.  | 414 on  |
|          |        |        |        |        |         | PLLO    |
|          |        |        |        |        | TOAR    | chans   |
|          |        |        |        |        | 417 on  | 9-14    |
|          |        |        |        |        | Backup  | bias    |
|          |        |        |        |        | PLLO    | shift.  |
|          |        |        |        |        |         |         |
|          |        |        |        |        | Status  | TOAR    |
|          |        |        |        |        | =Yellow | 421 on  |
|          |        |        |        |        |         | Ch      |
|          |        |        |        |        |         | annel-7 |
|          |        |        |        |        |         | e       |
|          |        |        |        |        |         | levated |
|          |        |        |        |        |         | NEDT's  |
|          |        |        |        |        |         | noise   |
+----------+--------+--------+--------+--------+---------+---------+
| **A      |        |        |        | ON     | ON      | ON      |
| MSU-A2** |        |        |        |        |         |         |
|          |        |        |        |        | Space   |         |
|          |        |        |        |        | Pos     |         |
|          |        |        |        |        | ition-2 |         |
+----------+--------+--------+--------+--------+---------+---------+
| **       |        |        |        | ON     | ON      | ON      |
| AMSU-B** |        |        |        |        |         |         |
|          |        |        |        | Bias   | Space   |         |
|          |        |        |        | in All | Pos     |         |
|          |        |        |        | Cha    | ition-3 |         |
|          |        |        |        | nnels. |         |         |
|          |        |        |        | Motor  |         |         |
|          |        |        |        | c      |         |         |
|          |        |        |        | urrent |         |         |
|          |        |        |        | surge  |         |         |
|          |        |        |        | 5/20   |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| ### HIRS | #####  | INOP   | ON     | ON     | ON      | ON      |
|          | ## OFF |        |        |        |         |         |
|          |        | Filter | Opera  | Opera  | Nominal | 1 Pixel |
|          | #####  | Wheel  | tional | tional |         | cross   |
|          | ### Fi | turned |        |        |         | track   |
|          | lter W | OFF    |        | FW in  |         | misal   |
|          | heel A | 10/17. |        | Hi     |         | ignment |
|          | nomaly | Elect  |        | power, |         | .       |
|          |        | ronics |        |        |         |         |
|          |        | On     |        | FW     |         |         |
|          |        |        |        | H      |         |         |
|          |        |        |        | eaters |         |         |
|          |        |        |        | OFF    |         |         |
|          |        |        |        |        |         |         |
|          |        |        |        | Filter |         |         |
|          |        |        |        | Motor  |         |         |
|          |        |        |        | c      |         |         |
|          |        |        |        | urrent |         |         |
|          |        |        |        | s      |         |         |
|          |        |        |        | urges. |         |         |
|          |        |        |        | Last   |         |         |
|          |        |        |        | in     |         |         |
|          |        |        |        | cident |         |         |
|          |        |        |        |        |         |         |
|          |        |        |        | 31 May |         |         |
|          |        |        |        | 03     |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| **MSU**  | ##     | INOP   | ON     |        |         |         |
|          | ## OFF |        |        |        |         |         |
|          |        | Scan   | Scan   |        |         |         |
|          | A      | Motor  | motor  |        |         |         |
|          | ntenna | turned | and    |        |         |         |
|          | Failed | OFF    | a      |        |         |         |
|          |        | 3      | ntenna |        |         |         |
|          |        | /12/03 | pr     |        |         |         |
|          |        |        | oblems |        |         |         |
|          |        | Elect  |        |        |         |         |
|          |        | ronics |        |        |         |         |
|          |        | ON.    |        |        |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| **SSU**  | ON     |        | ON     |        |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| **DCS**  | ON     | ON     | ON     | ON     | ON      | ON      |
|          |        |        |        |        |         |         |
|          |        |        |        |        | Nominal | Nominal |
+----------+--------+--------+--------+--------+---------+---------+
| **SARR** | ON     |        | ON     | ON-A   | ON-A    | ON-A    |
|          |        |        |        |        |         |         |
|          | Low    |        |        | All    | All AGC | Nominal |
|          | signal |        |        | AGC    | Mode    |         |
|          |        |        |        | Mode   |         | All AGC |
|          |        |        |        |        | (B-side | Mode    |
|          |        |        |        | Interm | R       |         |
|          |        |        |        | ittent | eceiver |         |
|          |        |        |        | fa     | in FG   |         |
|          |        |        |        | ilures | mode)   |         |
|          |        |        |        | for    |         |         |
|          |        |        |        | 243MHz | 243 MhZ |         |
|          |        |        |        | A&B    | INOPE   |         |
|          |        |        |        |        | RATIVE. |         |
+----------+--------+--------+--------+--------+---------+---------+
| **SARP** | ON     |        | OFF    | ON     | ON      | ON      |
|          |        |        |        |        |         |         |
|          | N      |        | Failed | N      | Nominal | Nominal |
|          | ominal |        | Power  | ominal |         |         |
|          |        |        | Supply |        | RCVR    |         |
|          |        |        |        | RCVR   | B/W = 2 |         |
|          |        |        |        | B/W =  |         |         |
|          |        |        |        | 2      |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| **SEM**  |        | ON     | ON     | ON     | ON      | ON      |
|          |        |        |        |        |         |         |
|          |        | El     | El     | N      | Nominal | Nominal |
|          |        | ec-CH- | ec-CH- | ominal |         |         |
|          |        | HVPS=4 | HVPS=0 |        | E-CDEM  | E-CDEM  |
|          |        |        |        | E      | -HVPS=4 | -HVPS=2 |
|          |        | Pr     | Pr     | -CDEM- |         |         |
|          |        | ot-CH- | ot-CH- | HVPS=2 | P-CDEM  | P-CDEM  |
|          |        | HVPS=0 | HVPS=0 |        | -HVPS=4 | -HVPS=3 |
|          |        |        |        | Since  |         |         |
|          |        |        | 1 of 4 | 1      | since   | since   |
|          |        |        | Tele   | /14/03 | 4/15/03 | 2/18/03 |
|          |        |        | scopes |        |         |         |
|          |        |        | inope  | P      |         |         |
|          |        |        | rative | -CDEM- |         |         |
|          |        |        |        | HVPS=0 |         |         |
+----------+--------+--------+--------+--------+---------+---------+
| **SBUV** | INOP   |        | ON     |        | ON      | ON      |
|          |        |        |        |        |         |         |
|          | (G     |        | Occa   |        | AMSU    | Nominal |
|          | rating |        | sional |        | EMI     |         |
|          | motor  |        |        |        | causing | Anode   |
|          | turned |        | R      |        | erratic | Mode    |
|          | OFF    |        | educed |        | B       |         |
|          | 5      |        | G      |        | ehavior |         |
|          | /29/03 |        | rating |        | from    |         |
|          |        |        | Drive  |        | PMT     |         |
|          | Elect  |        | Motion |        | cathod, |         |
|          | ronics |        |        |        | in      |         |
|          | and    |        |        |        | range 3 |         |
|          | Heater |        |        |        | No      |         |
|          | remain |        |        |        | cor     |         |
|          | ON     |        |        |        | rective |         |
|          |        |        |        |        | action  |         |
|          |        |        |        |        | p       |         |
|          |        |        |        |        | ossible |         |
+----------+--------+--------+--------+--------+---------+---------+
| **       |        |        |        | N/A    | ON      | ON      |
| SADPOS** |        |        |        |        |         |         |
|          |        |        |        |        | ENABLED | ENABLED |
|          |        |        |        |        |         |         |
|          |        |        |        |        | MFactor | D       |
|          |        |        |        |        | =50%    | isabled |
|          |        |        |        |        |         | 5/31    |
|          |        |        |        |        | D       | 01:46   |
|          |        |        |        |        | isabled | to      |
|          |        |        |        |        | 5/31    | 06:30Z  |
|          |        |        |        |        | 01:46   | then    |
|          |        |        |        |        | to      | Re-     |
|          |        |        |        |        | 06:30Z  | enabled |
|          |        |        |        |        | then    | for     |
|          |        |        |        |        | Re-     | solar   |
|          |        |        |        |        | enabled | eclipse |
|          |        |        |        |        | for     |         |
|          |        |        |        |        | solar   |         |
|          |        |        |        |        | eclipse |         |
+----------+--------+--------+--------+--------+---------+---------+
|          |        |        |        |        |         |         |
+----------+--------+--------+--------+--------+---------+---------+
|          | *      | *      | *      | *      | **N16** | **N17** |
|          | *N11** | *N12** | *N14** | *N15** |         |         |
+----------+--------+--------+--------+--------+---------+---------+

**COMMENTS/CHANGES:**

NOAA-11 With end-of-life testing officially completed, the SBUV grating
motor was powered off (electronics and heaters remain

on) at 19:55Z on 5/29/03. It is not expected to be re-activated.
Currently, reducing the number of N11 supports to

1 per day is under consideration by NOAA management with no decision yet
forthcoming.

In response to EMOSS predictions of possibly lower than healthy voltage
outputs during the 31 May solar eclipse l, EMOSS engineers increased the
Battery 1 and 2 charge rates on N11 to Medium (from low). Battery 3
remained at low rate because it is considered less healthy than 1 or 2.
This operation was performed for precautionary purposes on 30 May at
21:20Z and both batteries were commanded back to low rate charge on 2
Jun at 15:15Z. The spacecraft experienced no unanticipated problems
during the two eclipse events to which it was subjected.

NOAA-12. EMOSS engineer Jim Sheperd has generated plans to perform a
clock update on N12 by adding 1250 mSecs on a pass

scheduled for 6 Jun at 11:45Z.

N12 apparently went through the solar eclipse with no significant
problems. However, there is no data on N12 for the time that it
experienced the eclipse so detailed analysis is not possible

NOAA-14: AVHRR scan motor current improved over the past week although
imagery remains corrupted (Illustration 1).

In order to keep the command clock within +/- 75 msecs (1 AVHRR pixel)
EMOSS has generated and submitted plans to the scheduling office to
perform an N14 clock update of --150 msecs on 10 Jun 03

Extrapolation analysis on N14 battery voltages have indicated that N14
will be able to make it through peak eclipse (20% darkness NLT 20 June)
with ample margin to avoid an undervoltage trip (illustration 2).
Analysis of N14 battery performance during the solar eclipse of 31 May
shows nominal performance, in-line with predictions derived by the EMOSS
model (illustrations 2 and 9a)

Starting 5 Jun, N14 SBUV standard operations will be pared back in order
to reduce SOMS SBUV conflicts. This change will entail discontinuing the
execution of SOMS command procedure SBUGSB and a reduction to once a
week for running procedures SBGRTDV2, 14SPLD1, and SBLAMPCO. No user
impact is expected because of adequate coverage by newer spacecraft that
are also supporting the SBUV program.

NOAA-15: Extrapolation analysis on N15 battery voltages have indicated
that N15 will be able to make it through peak eclipse

(20% darkness on 17 June) with ample margin to avoid an undervoltage
trip (illustration 3). Analysis of N15 battery performance during the
solar eclipse of 31 May shows nominal performance, in-line with
predictions derived by the EMOSS model (illustrations 3 and 9a)

On 31 May at approximately 13:00Z, shortly after all solar eclipse
events were completed, the N15 HIRS filter motor experienced a "typical
surge" accompanied by a typical increase in temperature. These values
have since returned close to nominal. Imagery analysis indicates but
does not confirm that this event had a negative impact on data quality.
(Illustration 4)

In order to keep the command clock within +/- 75 msecs (1 AVHRR pixel)
EMOSS has generated and submitted plans to the scheduling office to
perform an N15 clock update of +100 msecs on 10 Jun 03

NOAA-16: EMOSS engineers continue to monitor the status of N16 gyros
whose performance characteristics changed recently (as

reported 20 May 03.). Currently gyro performance remains well within
spec. However, EMOSS ADACS engineer Jim Sheperd has determined that the
values on the A-channel are "cleaner" than those on the B-channel, and
is suggesting a that a switch to the A channel be considered
(Illustration 5.)

On 31 May at 01:00Z SADPOS software was disabled for the entire duration
of the solar eclipse event which started at 01:30Z. EMOSS engineer Jon
Woodward verified the status of this software by dumping the GDSADCTL
(SAD Control Status) status word at the next available pass. At 07:00,
the stored command table re-enabled SADPOS software which was again
verified by Jon Woodward by dumping the SADPOS Status word on a
successive pass. Analysis of N16 battery performance during the solar
eclipse of 31 May shows nominal performance, in-line with predictions
derived by the EMOSS model (illustrations 6 and 9b)

STX-3 performance testing will be implemented on 3 and 4 Jun out of
stored commands. During these tests the satellite will rise with STX 1
and STX 3 transmitting HRPT. All data playbacks for these revs will be
taken on STX2. Wallops will configure the backup 13m antenna to feed STX
1 and STX 3 data to the PAS system which will record both channels for
engineering analysis. PAS is to be configured to the backup system only
and the tests should not interfere with operational activities. This
test is being conducted to determine the possibility of RF spectrum
monitoring equipment offsets at the Wallops CDA and to help determine
the actual capability of the anomalous STX-3 transmitter on N16.

In order to keep the command clock within +/- 75 msecs (1 AVHRR pixel)
EMOSS has generated and submitted plans to the scheduling office to
perform an N16 clock update of -100 msecs on 10 Jun 03

NOAA-17: In order to keep the command clock within +/- 75 msecs (1 AVHRR
pixel) EMOSS has generated and submitted plans

to the scheduling office to perform an N17 clock update of -100 msecs on
10 Jun 03

On 31 May at 01:00Z SADPOS software was disabled for the entire duration
of the solar eclipse event which started at

01:30Z. EMOSS engineer Jon Woodward verified the status of this software
by dumping the GDSADCTL (SAD Control Status) status word at the next
available pass. At 07:00, the stored command table re-enabled SADPOS
software which was again verified by Jon Woodward by dumping the SADPOS
Status word on a successive pass. Analysis of N17 battery performance
during the solar eclipse of 31 May shows nominal performance, in-line
with predictions derived by the EMOSS model (illustrations 7 and 9b)

Another precautionary measure to prepare N17 for the solar eclipse event
was the EMOSS recommendation to place

the attitude control mode into YGC. This was recommended because the
EMOSS eclipse model predicted (accurately) that a yaw update would occur
while the spacecraft was being eclipsed. In this eventuality, the
spacecraft would likely autonomously switch to YGC mode and it was
determined that it was better to manually command the spacecraft to YGC
rather than have flight software take control. The switch to YGC was
implemented nominally on 30 May at 14:45Z. While planning the switch,
EMOSS engineers had considered the risks and benefits of clearing the
FORCE YGC MODE flag which occurs when YGC mode is manually commanded.
Clearing this flag would have prevented the software from performing a
passive wheel test and possibly switching to the Skew reaction wheel (as
occurred on 9 Oct 01 with N16). However, clearing the flag also disables
the backup potential of the Skew wheel and, if an actual wheel failure
occurs, prevents the skew wheel from being autonomously activated to
replace the failed wheel which could result in a far more severe
anomaly. By not clearing the flag, engineers were cognizant that the
likelihood of passive wheel tests and inadvertent wheel swaps were
significant. This is because while in YGC mode, yaw error rates are
significantly higher than when in normal attitude control mode, very
often greater than the 1 degree threshold (for 20 seconds) that causes
the test to initiate. Since either choice had negative possible
outcomes, the team decided on the least risky course and decided to keep
the FORCE YGC MODE flag uncleared.

On 1 Jun at 15:03:58, the yaw error value exceeded the threshold for
initiating a passive wheel test. At the time the test

was running, a sun moon incursion occurred in quadrant 3 which caused
the reaction wheels to rapidly spin up 400 RPM in a short period of time
in order to compensate. The passive wheel test measures delta wheel
speeds over a 13 second duration. If the delta value is between 5 and
160 RPM the test passes. Less than 5 RPM during this interval and the
software assumes the wheel is stuck. Greater than 160 RPM and the
software assumes the wheel is "running away". In either of those cases,
the test fails. If the test fails, it is re-intiated. If the test fails
4 times in a succession, the software turns off the offending wheel and
turns on the Skew wheel. This is what happened to N17 during this
passive wheel test. At 15:04:02Z, the flight software initiated the Skew
wheel to take over yaw control and powered off the X wheel even though
there was nothing actually wrong with it (illustration 8).

At 15:30, the first pass after the autonomous wheel switch, SOCC
controllers noticed the swap had occurred and called engineers. Renee
SmitherDearing, Jim Sheperd, Jon Woodward and Jeff Devine responded to
the call and performed analysis on the situation. Once the situation was
determined, it was decided to switch back into attitude normal mode a
day earlier than had been originally planned. This switch and a command
to clear the YGC Mode flag was implemented on 1 Jun at 20:30Z. This had
the immediate effect of reducing the yaw errors to significantly below
the 1 degree PWT threshold. On 2 Jun at 20:05Z, the X- wheel was turned
back on, the skew wheel was turned off and N17 was back in its standard
operational configuration.

The reason this situation occurred was because everything worked exactly
as it was supposed to. Lessons learned to prevent future occurrences of
this situation could include the following:

1.  Minimizing the time duration of time that FORCED YGC mode is
    sustained. Rather than leaving it in YGC all weekend, it could have
    been left in that mode for only the 6 hours encompassing the solar
    eclipse event for which it was originally initiated.

2.  Reduce the possibility of unnecessary passive wheel tests by
    "opening up the limit" on yaw errors values and/or the duration that
    the value is sustained while in YGC mode

3.  Increase the high delta value for failing a test or the number of
    test faiures required before a swap occurs.

4.  Software patch to disable passive test if a sun-moon intrusion flag
    is set.

5.  Developing yaw value filtering software to offset the "noisier" yaw
    values associated with YGC mode..

On Wednesday June 4 N-17 revs 4898 (0202z) and 4906 (1601z) have been
scheduled to test STX 3 performance. On these revs the satellite will
rise with STX 1 and STX 3 transmitting HRPT. All data playbacks for
these revs will be taken on STX2. Wallops will configure the backup 13m
antenna to feed STX 1 and STX 3 data to the PAS system which will record
both channels for engineering analysis. PAS is to be configured to the
backup system only, these tests should not interfere with operational
activities. This test is identical to the one being performed on N16

MISC: Meetings supported by EMOSS personnel this week included the AMSU
Channel-3 noise Tiger Team, the TOAR

Board, and a NOAA-N and N' discussion for 1.33 a mbps waiver.

EMOSS developed a new STK bases solar eclipse model that allowed EMOSS
to predict potential anomalies that might occur during the solar eclipse
event. Post event analysis (illustrations 9a and 9b ) has shown this
model to have been very accurate during the most recent solar eclipse
thus validating the models utility for future events.

![](media/image1.wmf){width="7.5in" height="4.272222222222222in"}

![](media/image2.png){width="4.580555555555556in"
height="4.1194444444444445in"}**[AVHRR Image taken 3 Jun 03 at
13:30Z]{.underline}**

**[Illustration 1: N14 AVHRR health analysis]{.underline}**

![](media/image3.wmf){width="8.5in" height="6.440972222222222in"}

**[Illustration 2: N14 EPS performance during solar eclipse and eclipse
season]{.underline}**

![](media/image4.wmf){width="8.5in" height="6.440972222222222in"}

**[Illustration 3: N15 EPS performance during solar eclipse and eclipse
season]{.underline}**

![](media/image5.wmf){width="8.5in" height="4.875in"}

![](media/image6.png){width="3.125in" height="3.75in"}

![](media/image7.png){width="3.084722222222222in" height="3.75in"}**N15
HIRS 31 May 13:30Z N15 HIRS 31 May 16:40Z**

**[Illustration 4. N15 Peak HIRS surge analog and imagery analysis for
31 May 03]{.underline}**

![](media/image8.wmf){width="8.375in" height="6.253472222222222in"}

**[Illustration 5: N16 A vs B Gyro performance over the past
month]{.underline}**

**[(A-gyro data set incomplete)]{.underline}**

![](media/image9.wmf){width="8.5in" height="6.440972222222222in"}

**[Illustration 6: N16 Solar Eclipse Event EPS analysis]{.underline}**

**[31 May 03 (02:20 through 09:30Z)]{.underline}**

![](media/image10.wmf){width="8.5in" height="6.440972222222222in"}

**[Illustration 7: N17 Solar Eclipse Event EPS analysis]{.underline}**

**[31 May 03 (02:20 through 09:30Z)]{.underline}**

![](media/image11.wmf){width="8.5in" height="6.3375in"}

**[Illustration 8: N17 Autonomous Wheel Swap Analysis]{.underline}**

![](media/image12.wmf){width="7.875in" height="4.0in"}**[Illustration
9a: EMOSS eclipse model verification results]{.underline}**

**[N14 Predicted (blue) vs Actual (red) Solar eclipse
times]{.underline}**

![](media/image13.wmf){width="8.125in" height="4.0in"}

**[N15 Predicted (blue) vs Actual (red) Solar eclipse
times]{.underline}**

**[Illustration 9b: EMOSS eclipse model verification
results]{.underline}**

![](media/image14.wmf){width="8.0in" height="3.928472222222222in"}**[N16
Predicted (blue) vs Actual (red) Solar eclipse times]{.underline}**

![](media/image15.wmf){width="7.375in" height="4.527777777777778in"}

POLAR SPACECRAFT TIP CLOCK ERROR

NOAA-14: As of 04/23/03 the TIP clock is corrected daily by ---7.3 msec
to compensate for drift.

NOAA-15: As of 04/23/03 the TIP clock is corrected daily by ---8 msec to
compensate for drift.

NOAA-16: As of 04/23/03 the TIP clock is corrected daily by --5.1 msec
to compensate for drift.

NOAA-17: As of 04/23/03 the TIP clock is corrected daily by -1 msec to
compensate for drift.

NOAA-11: As of 09/03/02 the TIP clock is corrected daily by +70 msec to
compensate for drift.

NOAA-17: The TIP clock was corrected by --75 msec on 3/27/03 (23:59Z) to
eliminate the clock offset.

**N12: Plans to ADD 1250 mSecs to spacecraft command clock on 6 June**

**N14: Plans to Subtract 150 msec from spacecraft command on 10 June.**

**N15: Plans to ADD 100 msec to spacecraft command clock on 10 June.**

**N16: Plans to Subtract 100 msec from spacecraft command clock on 10
June.**

**N17: Plans to Subtract 100 msec from spacecraft command clock on 10
June.**

![](media/image16.wmf){width="7.625in" height="4.665972222222222in"}

![](media/image17.wmf){width="7.875in" height="1.9597222222222221in"}N17
CPU Single Event Upset (Error) Scrubs, Weekly Report

![](media/image18.wmf){width="7.5in" height="5.675694444444445in"}

![](media/image19.wmf){width="8.25in"
height="5.419444444444444in"}NOAA-17 Scrubber Hits by Geographic
Occurrence from 19 2003 through 25 May 2003:

**Red/Circle = CPU#1 Black/X = CPU#2**

***PACS DATA AVAILABILITY (%)***

May 23, 2003 through May 29, 2003

JDAY 143-149

  ----------- ------- ------ --------- --------- --------- ------------- -------------
                             NOAA15    NOAA14    NOAA11    NOAA16        NOAA17

  Friday      05/23   143    **99.9    100.0     100.0     100.0         100.0
                             (a)**                                       

                                                                         

  Saturday    05/24   144    100.0     100.0     100       **99.9(b)**   **99.8 (c)**

                                                                         

  Sunday      05/25   145    **99.9    100.0     100.0     100.0         **99.9(e)**
                             (d)**                                       

                                                                         

  Monday      05/26   146    100.0     100.0     100.0     **99.9 (f)**  100.0

                                                                         

  Tuesday     05/27   147    100.0     100.0     100.0     100.0         **99.9(g)**

                                                                         

  Wednesday   05/28   148    100.0     100.0     100.0     100.0         **99.9 (h)**

                                                                         

  Thursday    05/29   149    **99.3    100.0     100.0     100.0         100.0
                             (i)**                                       

                                                                         

                                                                         
  ----------- ------- ------ --------- --------- --------- ------------- -------------

**[Comments:]{.underline}**

(a) Rev 26111/W: G4B noisy; 98.8% recovered 3DL 11PE.

(b) Rev 13755/F: G2A noisy; 98.7% recovered.

(c) Rev 04742/W: G4B noisy; 99.0% recovered.

(d) Rev 26153/F: G3A noisy; 98.8% recovered.

(e) Rev 04766/F: G3B noisy; 98.7% recovered.

(f) Rev 13784/F: G3B noisy; 99.5% recovered 1DL.

(g) Rev 04786/F: G4A noisy; 99.9% recovered.

(h) Rev 04800/F: G2A noisy; 99.9% recovered.

(i) Rev 26203/W: G3B noisy; 99.0% recovered.

**[DTR Inf. (\*):]{.underline}**

NOAA-11 DTR 1B -Inoperative.

> DTR 2A/B -Frequently noisy

DTR 4B -Frequently noisy

DTR 5A/B -Inoperative

NOAA-12 DTR 5A -Inoperative.

DTR 2B -Occasionally noisy and short

NOAA-14 DTR 4A/B -Inoperative.

DTR 3B -Unreliable playbacks, Removed from operations.

DTR 2A -Inoperative, DOY/200

NOAA-15 DTR 5A/B - Inoperative

NOAA-16 DTR 5A/B -Inoperative

DTR 3A -safe state change 1B

DTR 4B --Inoperative 1/12/03

NOAA-17 DTR 5A/B-Inoperative 2/16/03 Anomaly

**[Acronyms:]{.underline}**

DL -- Drop lock(s) PE - Parity Error(s) DQR - Data Quality Report

BE - Bit Error(s) DAR - Data Accountability Report MFR - Multi-Function
Receiver