**POLAR Spacecraft Status As of: Thu 29 Jan 2009, 12:00 EST**

*(Changes* from last week in bold border)

+----------+-------------+-------------+-------------+---------------+
| **Subs   | *           | *           | ###         | #             |
| ystem/** | *NOAA-15K** | *NOAA-16L** | ## NOAA-17M | #### NOAA-18N |
|          |             |             |             |               |
| **Com    | AM:         | PM:         | AM:         | PM 13:49=AN   |
| ponent** | 17:49=AN    | 15:04=AN    | 22:23=AN    |               |
|          |             |             |             | GAC & LAC     |
|          | GAC data    | GAC data    | GAC&LAC     | data          |
|          | only        |             | data        |               |
+==========+=============+=============+=============+===============+
| **LA     | 05/13/98    | 09/21/00    | 6/24/02     | ###           |
| UNCHED** |             |             |             | #### 5/20/05  |
+----------+-------------+-------------+-------------+---------------+
| **CNTL   | OBP2        | OBP2        | OBP2        | OBP2          |
| OBP**    |             |             |             |               |
+----------+-------------+-------------+-------------+---------------+
| **BUS**  | B-BUS       | B-BUS       | B-BUS       | B-BUS         |
|          |             |             |             |               |
|          | XSU-1       | XSU-2:      | XSU-2:TOAR  | XSU-1         |
|          |             | TOAR472     | 471         |               |
+----------+-------------+-------------+-------------+---------------+
| **BUS    | NO          | NO          | NO          | NO            |
| VETO**   |             |             |             |               |
+----------+-------------+-------------+-------------+---------------+
| *        | [Nominal    | ###### [R   | ###### [Nom | [Nominal      |
| *ADACS** | Mode]{      | GYRO Mode]{ | inal Mode]{ | Mode          |
|          | .underline} | .underline} | .underline} | ]{.underline} |
|          |             |             |             |               |
|          | Rgm         | Forced      | Rgm         | Gyro-A MIMU-2 |
|          | ode=Monitor | Nominal     | ode=Monitor |               |
|          |             | Mode        |             | Z-wheel       |
|          | Gyro-3 Off  |             | Gyro-3 Off  | -Pitch        |
|          | 6/26/00     | Estimate    | 6/10/04     |               |
|          | Gyro        | Y-ROLL      |             | Z-momentum    |
|          | chans=AAB   |             | Gyro        | transition    |
|          |             | Rgm         | chans=AAB   | complete      |
|          | N2 Low PSI  | ode=PASSIVE | GAS Enabled |               |
|          | invalid     |             | Dec 05      | Pitch Torquer |
|          |             | Gyros-1 & 3 |             | again active  |
|          |             | Inop/Off    | \*Z Gas     |               |
|          |             |             | unload =45  | Gas auto      |
|          |             | Gyro chans  |             | unloading     |
|          |             | XA-ZB       |             | enabled &\*Z  |
|          |             |             |             | Gas unload    |
|          |             | Pitch wheel |             | =45 12/9/08   |
|          |             | bias 2400   |             |               |
|          |             |             |             |               |
|          |             | \*Z gas     |             |               |
|          |             | unload =    |             |               |
|          |             | 145         |             |               |
|          |             |             |             |               |
|          |             | Gyro2 safe  |             |               |
|          |             | macro       |             |               |
+----------+-------------+-------------+-------------+---------------+
| **RXO**  | PRI         | PRI         | PRI         | PRI           |
|          |             |             |             |               |
|          | daily bias  | Daily Bias  | Daily Bias  | No daily bias |
|          | -8 mS       | --5.5 mS    | --3 mS      |               |
|          |             |             |             | -1500 mS      |
|          | -500 mS     | -1500 mS    | -1500 mS    | 31Dec05       |
|          | 12/31/05    | 31Dec05     | 31Dec05     |               |
+----------+-------------+-------------+-------------+---------------+
| **CLOCK  | 2           | 2           | 2           | 2             |
| DIV**    |             |             |             |               |
+----------+-------------+-------------+-------------+---------------+
| **MIRP** | External    | External    | External    | External      |
|          | Synch       | Sync        | Sync        | Synch         |
|          | Rephase     |             |             |               |
|          | 0730 daily  | Rephase     | Rephase     | Rephase       |
|          |             | each orbit  | Enabled     | Enabled       |
+----------+-------------+-------------+-------------+---------------+
| **TIP    | 2           | 2           | 2           | 1             |
| SIDE**   |             |             |             |               |
|          | since       | since       | Swapped     | Analog telem  |
|          | 4/3/03      | 4/18/05     | 9/20/06     | drifting      |
|          |             |             |             |               |
|          | 3 channels  | analog      | analog      |               |
|          | inop        | telem       | telem       |               |
|          |             | drifting    | drifting    |               |
|          | analog      |             |             |               |
|          | telem       |             |             |               |
|          | drifting    |             |             |               |
+----------+-------------+-------------+-------------+---------------+
| **Rec    | DTRs 1, 2,  | DTRs 1, 2,  | DTR 1,3,4 / | SSRs          |
| orders** | 3, 4        | 3, 4A       | SSR 2       | 1,2,3,4,5     |
|          | Safestate   |             |             |               |
| **(DTR,  | 1B EOT      | Safestate   | Sa          | Safestate=5B  |
| SSR)**   |             | 3A          | festate=SSR |               |
|          |             |             | 2B          | Current       |
|          |             | 4B STIP     |             | spikes        |
|          |             | only        | 4A Pressure |               |
|          |             |             | leak        |               |
+----------+-------------+-------------+-------------+---------------+
| **VTX**  | #1 ON       | OFF / INOP  | #2 ON       | #1 ON         |
|          |             |             |             |               |
| (APT     | As of 19    | since       | 137.62 MHZ  | 137.1 MHZ     |
| data)    | June 07     | 11/15/00    |             |               |
|          |             |             |             | As of 16 Aug  |
|          |             |             |             | 07            |
+----------+-------------+-------------+-------------+---------------+
| **BTX**  | #1          | #2          | ####### #2  | #1            |
|          |             |             |             |               |
|          | 137.35 MHZ  | 137.77 MHZ  | 137.77 MHZ  | 137.35 MHZ    |
+----------+-------------+-------------+-------------+---------------+
| **STX**  | 2-Omni HRPT | 2 -- HRPT   | 1 -- HRPT   | 3 - HRPT      |
|          |             |             |             |               |
| 1 = rcp  | 2 Omni=rcp  | 1--         | TOAR424 low | 1 - Playback  |
| 1698.0   |             | Playback    | power       |               |
| mhz      | Power TOAR  |             |             | 2 - Playback  |
|          | 446         | 4 Standby   | 2 & 4       |               |
| 2 = lcp  |             |             | Playback    | 4-Test &      |
| 1702.5   | 4-Playback  | 3 low power |             | Standby       |
| mhz      |             | INOP -10    | STX-1 Power |               |
|          | 1,2         | Aug 2007    | drop 2.29W  |               |
| 3= rcp   | ,3-Degraded |             | 3/2/08      |               |
| 1707.0   |             |             |             |               |
| mhz      |             |             | STX-4       |               |
|          |             |             | nominal     |               |
| 4= rcp   |             |             |             |               |
| 2247.5   |             |             | STX-3       |               |
| mhz      |             |             | Failed      |               |
|          |             |             | 2/14/08     |               |
+----------+-------------+-------------+-------------+---------------+
| #        | [Array Off  | [Array Off  | [Array Off. | [Array Off.   |
| ## POWER | -45]{       | -20]{       | --55]{      | -40           |
|          | .underline} | .underline} | .underline} | ]{.underline} |
| (Array   |             |             |             |               |
| offset   | [Since      | [Since      | [Since      | [Since        |
| and CANT | 1/25/01]{   | 9/13/]{.u   | 12/18/08]{  | 6/6/05        |
| angle,   | .underline} | nderline}07 | .underline} | ]{.underline} |
| eclipse  |             |             |             |               |
| states   | Full Sun    | Eclipse all | Eclipse all | Eclipse all   |
| and sun  |             | year        | year        | year          |
| angle)   | Sun Angle   |             |             |               |
|          | 13          | Sun Angle   | Sun Angle   | Sun Angle 63  |
|          |             | 34          | at 66       | uptrend to 65 |
|          | Uptrend to  |             |             | on            |
|          | 18 early    | Steady      | Steady      |               |
|          | Jan 07      | trend       | trend       | 1 Jan 07      |
|          |             |             |             |               |
|          | SA CANT=37  | SA CANT=22  | SA CANT=37  | SA CANT=22    |
|          | degs        | degs        | degs        |               |
|          |             |             |             | BVR Phase     |
|          |             | Full sun    | BVR Phase   | Control auton |
|          |             | S/C in Sept | Control     | swap 3/29/06  |
|          |             | 07          | auton swap  | & 1/4/07      |
|          |             |             | 9/17/07     |               |
|          |             | BVR Phase   |             |               |
|          |             | Control     | Swap back   |               |
|          |             | auton swap  | 9/18/07     |               |
|          |             | 7/19/07     |             |               |
|          |             |             | SADPOS      |               |
|          |             |             | Enabled     |               |
|          |             |             | 2/12/08     |               |
|          |             |             |             |               |
|          |             |             | PSE swap to |               |
|          |             |             | back-up     |               |
|          |             |             | 11/3/08     |               |
+----------+-------------+-------------+-------------+---------------+
| *        | Nominal     | Nominal     | ### Nominal | Nominal       |
| *AVHRR** |             |             |             |               |
|          | Channel 3B  | Recent SM   | 3A-B switch | Channel 3B    |
|          | only        | current     | enabled     | only          |
|          |             | increases   |             |               |
|          | Occasional  |             | Previous    | Scan motor    |
|          | minor scan  | TCE24 OFF   | scan motor  | current drop  |
|          | motor       | 4/14/04     | current     | 29 Aug 06     |
|          | in          |             | mini surges |               |
|          | stabilities | Channel 3B  |             |               |
|          |             | only        |             |               |
+----------+-------------+-------------+-------------+---------------+
| **A      | Operational | Operational | OFF/INOP    | Nominal       |
| MSU-A1** |             |             |             |               |
|          | Ch14        | Primary     | Since       | Full Scan     |
|          | inoperative | PLLO chans  | 10/30/03    | mode          |
|          |             | 9-14 bias   |             |               |
|          | Ch11        | shift.      | Survival    |               |
|          | inoperative |             | heat on.    |               |
|          |             | Backup PLLO |             |               |
|          |             | inop.       |             |               |
|          |             |             |             |               |
|          |             | Channel     |             |               |
|          |             | 9-14 noise  |             |               |
|          |             |             |             |               |
|          |             | Channel 4   |             |               |
|          |             | severely    |             |               |
|          |             | degraded 4  |             |               |
|          |             | Mar 08      |             |               |
+----------+-------------+-------------+-------------+---------------+
| **\`A    | Nominal     | Nominal     | Nominal     | Nominal       |
| MSU-A2** |             |             |             |               |
|          |             |             |             | DIG-A Temps   |
|          |             |             |             | erratic       |
|          |             |             |             | 2/7/08        |
|          |             |             |             |               |
|          |             |             |             | Cold Cal Pos  |
|          |             |             |             | 2 2/21/08     |
|          |             |             |             |               |
|          |             |             |             | DIG-A Temps   |
|          |             |             |             | return to     |
|          |             |             |             | nominal       |
|          |             |             |             | 8/5/08        |
+----------+-------------+-------------+-------------+---------------+
| **       | Operational | Operational | Nominal     | ***Replaced   |
| AMSU-B** |             |             |             | by MHS***     |
|          | Bias in All | Space       |             |               |
|          | Chans.      | Position-3  |             |               |
|          |             |             |             |               |
|          | Degraded    | Chan-8      |             |               |
|          | Chan-3      | degradation |             |               |
+----------+-------------+-------------+-------------+---------------+
| ### HIRS | NOMINAL     | NOMINAL     | NOMINAL     | ########      |
|          |             |             |             |  Operational  |
|          | FW Abrupt   | New all     | 1 Pixel     |               |
|          | return to   | time high   | cross-track | Filter Heat   |
|          | nominal     | filter      | mi          | OFF.          |
|          | 7/12/05     | motor       | salignment. |               |
|          |             | current     |             | ####          |
|          | After years | reached     |             | #### LW chann |
|          | of minor    | 9/17/06.    |             | el 1-12 noise |
|          | and major   |             |             |  TOAR 448 Loo |
|          | current     | Imagery     |             | se LWIR lens. |
|          | surges      | o           |             |               |
|          |             | ccasionally |             | LW imagery    |
|          | FW mode=Hi  | exhibits    |             | erratic.      |
|          | Powr        | high levels |             |               |
|          |             | of          |             | CH 1 Period   |
|          |             | radiometric |             | Monitor event |
|          |             | noise       |             | 13 May 08     |
+----------+-------------+-------------+-------------+---------------+
| ###      |             |             |             | Nominal       |
|  MHS/MIU |             |             |             |               |
|          |             |             |             | Fly Wheel     |
|          |             |             |             | Motor Current |
|          |             |             |             | occasionally  |
|          |             |             |             | spiking since |
|          |             |             |             | 27 Dec 06     |
|          |             |             |             |               |
|          |             |             |             | Entered Motor |
|          |             |             |             | Spin State on |
|          |             |             |             | 9 May 08      |
|          |             |             |             |               |
|          |             |             |             | H4 gain       |
|          |             |             |             | increased to  |
|          |             |             |             | 2-9 May 08    |
|          |             |             |             |               |
|          |             |             |             | H3 gain       |
|          |             |             |             | increased to  |
|          |             |             |             | 3-9 May 08    |
|          |             |             |             |               |
|          |             |             |             | H3/H4 QSB     |
|          |             |             |             | Instability   |
|          |             |             |             | latest 23 Dec |
|          |             |             |             | 08 Automatic  |
|          |             |             |             | DC Offset     |
|          |             |             |             | Adjustment    |
|          |             |             |             | enabled 5 Sep |
|          |             |             |             | 08            |
|          |             |             |             |               |
|          |             |             |             | H3 DCO        |
|          |             |             |             | changed to    |
|          |             |             |             | 0x91-4 Dec    |
|          |             |             |             | 08, H4 DCO    |
|          |             |             |             | changed to    |
|          |             |             |             | 0x91-23 Dec   |
|          |             |             |             | 08            |
+----------+-------------+-------------+-------------+---------------+
| **DCS**  | Nominal     | Nominal     | Nominal     | Nominal       |
|          |             |             |             |               |
| RFI      |             | Pseudo      |             | DRU's 1-7 On  |
| inves    |             | message     |             |               |
| tigation |             | turned on   |             | DRU8 inop/off |
|          |             | 1/5/06      |             |               |
+----------+-------------+-------------+-------------+---------------+
| **SARR** | Operational | Operational | Nominal     | Nominal       |
|          |             |             |             |               |
|          | B-Side      | Mode =AA    | A-side      | A-Side        |
|          | Receivers & |             |             |               |
|          | Converters  | A-side, AGC | All AGC     | All AGC Mode  |
|          | Activated,  | Mode        | Mode        |               |
|          | 13 Dec 07   |             |             | Since 15 Aug  |
|          |             | (B-side in  |             | 05            |
|          | AGC Mode    | FG mode)    |             |               |
|          |             |             |             |               |
|          | I           | 124 & 243   |             |               |
|          | ntermittent | MHz = INOP  |             |               |
|          | failures    | & OFF as of |             |               |
|          | for 243MHz  | 29 Jul 08   |             |               |
|          | A&B         |             |             |               |
|          |             | PDS ATT set |             |               |
|          |             | to 0dB, 406 |             |               |
|          |             | MHz RCVR    |             |               |
|          |             | ATT set to  |             |               |
|          |             | 2dB on 5    |             |               |
|          |             | Sept. 08    |             |               |
+----------+-------------+-------------+-------------+---------------+
| **SARP** | Nominal     | Nominal     | Nominal     | Nominal       |
|          |             |             |             |               |
|          | RCVR B/W =  | RCVR B/W =  |             | A-side 23     |
|          | 2           | 2           |             | May05         |
+----------+-------------+-------------+-------------+---------------+
| **SEM**  | Nominal     | Nominal     | Nominal     | Nominal       |
|          |             |             |             |               |
|          | E-          | E-          | E-          | E             |
|          | CDEM-HVPS=2 | CDEM-HVPS=7 | CDEM-HVPS=2 | lec-CH-HVPS=1 |
|          |             |             |             |               |
|          | P-          | P-          | P-          | 27 June 06    |
|          | CDEM-HVPS=0 | CDEM-HVPS=7 | CDEM-HVPS=4 | 17:00z        |
|          |             |             |             |               |
|          |             | 11 Jan      | 27 June 06  | P             |
|          |             | 0714:47z    | 16:00z      | rot-CH-HVPS=1 |
|          |             |             |             |               |
|          |             |             |             | 11 Jan 07     |
|          |             |             |             | 14:15z        |
+----------+-------------+-------------+-------------+---------------+
| **SBUV** |             | Operational | Nominal     | Operational   |
|          |             |             |             |               |
|          |             | Degraded    | Anode Mode  | Anode mode    |
|          |             | Ozone data  |             |               |
|          |             |             | Plan sweep  | since 6 July  |
|          |             | Backup      | mode        | 05 13:30z     |
|          |             | Diffuser    |             |               |
|          |             | inop        | Standard    | Electronics   |
|          |             |             | Ops         | turnoff taken |
|          |             | Primary     |             | out of STESM  |
|          |             | Diffuser    | TOAR 463    | safestate     |
|          |             | deployment  | sun glint   | table         |
|          |             | problem     |             |               |
|          |             | TOAR 426    | IBSL test   | TOAR 462 sun  |
|          |             |             | performed   | glint         |
|          |             | AMSU EMI    | 12 Sept 06  |               |
|          |             | causing     |             | Chop Motor    |
|          |             | erratic     | Grating     | stalled 22    |
|          |             | Behavior in | motor       | May 08 & 9    |
|          |             | PMT cathod, | in          | Nov 08.       |
|          |             | range 3     | vestigation |               |
|          |             |             |             | Thermal       |
|          |             |             |             | increase 1 to |
|          |             |             |             | 1.5 C, 31 Dec |
|          |             |             |             | 08, under     |
|          |             |             |             | investigation |
+----------+-------------+-------------+-------------+---------------+
| **       |             | ON          | ON          | ON            |
| SADPOS** |             |             |             |               |
|          |             | Enabled     | ENABLED     | Enabled       |
|          |             | MFactor50%  |             |               |
|          |             |             | Timer =     | Timer =12     |
|          |             | Timer = 12  | 12mins      | mins          |
|          |             | mins        |             |               |
+----------+-------------+-------------+-------------+---------------+
| **T      | TCE26 & 15H | Nominal     | TCE3H Batt  | All TCE's     |
| HERMAL** |             |             | 2A heater   | active        |
|          | Telem valid | TCE24 OFF   | failed ON,  |               |
| Heaters, |             | 4/14/05     | turned off  | HIRS filter   |
| louvers  | TOAR 432    |             | 8/26/03     | heater turned |
|          | closed      | (AVHRR H&L) |             | OFF 9/28/06   |
| TCE's    |             |             | AMSU-A1     |               |
|          | TCE24L&25L  | HIRS Filter | survival    |               |
|          | (HIRS &     | heater      | heaters on  |               |
|          | AVHRR)      | turned OFF  | 10/29/03    |               |
|          | failed      | 1/18/05     |             |               |
|          | 5/13/98     |             |             |               |
|          |             |             |             |               |
|          | RCE         |             |             |               |
|          | thermostat  |             |             |               |
|          | failed      |             |             |               |
|          | 5/13/98     |             |             |               |
|          |             |             |             |               |
|          | Spacecraft  |             |             |               |
|          | in thermal  |             |             |               |
|          | uptrend     |             |             |               |
+----------+-------------+-------------+-------------+---------------+

**COMMENTS/CHANGES:**

MISC: CDA Beacon testing on Monday 1/26 was successful for both
Fairbanks and Wallops for all spacecrafts.

There are ongoing issues with loopback testing of the NOAA-19 encryptor
with FBK; a new CEM is being sent to SOCC and planned to be installed on
Friday, 30 Jan 2008.

As predicted by EMOSS Engineering this solar event was a non-event for
YAW update, day/night, night/day flagging, sun flag loss, and SADPOS. 
 NOAA-16 was affected most followed by NOAA-15, NOAA-18 and NOAA-17.
EMOSS engineering supported this solar event during the early morning of
Monday, January 26, 2009

NOAA-15: There were relatively no changes to the NOAA-15 bus or payload
health situation during the past week.

The #2 gyro is still relatively quiet. Daily monitoring continues.

NOAA-16: There was relatively no change in the performance of the
NOAA-16 bus & payload subsystems during the past week.

Figure 2 is from the analysis/procedure for NOAA-16 and Figure 3 is real
data from NOAA-16.  The percent sun predicted is about 32% versus 30.1%
measured.  The predicted loss sun is at 09:50:45 versus measured at
09:51.  The YAW update predicted is at 09:14 versus measured 09:14.  
Figure 3 also shows missing data for the first eclipse event on N-16. 
Figure 3 further shows that the patch current reads zero when the array
current reads about 10 amps. 

NOAA-17: There was relatively no change in the performance of the
NOAA-17 bus & payload subsystems during the past week.

LAC 4A was noisy on primary and backup strings during playback. John
Vollmer was notified about the possible playback degradation of 4A/4B on
NOAA 17. This is being investigated.

Figure 4 shows no further bus voltage spikes at array offset of -55
degrees.  Possible alternatives to moving the array to a -50 degree
offset for shunt drive going on and off at sunrise are being considered
such as turning off a load at sunrise or increasing the charge rate to
one of the batteries.

NOAA-18: There was relatively no change in the performance of the
NOAA-18 bus & payload subsystems during the past week.

STX-4 was turned on 27 & 28 Jan 2008 to support ground station testing
for the NOAA-N PRIME Launch.

MetOp-A: The changes to the health and safety of the NOAA instruments on
MetOp-A this past week are listed below:

[Trend Observations (NOAA Instruments) ]{.underline}

-   Based on the CVF Digital A daily, weekly and long term trend
    reports, all AMSU, AVHRR and HIRS parameters are nominal and
    stable.  All performance parameters are well within specification
    (e.g. NEdT, NEdN, NEdA and SNR), with the exception of AMSU-A1
    Channel 7 NEdT which has exceeded the 0.25 K specification and is
    currently at 0.39 K and steeply increasing (refer to attached NEdT
    and Gain plots).  The AMSU HK and science trends are summarized each
    week in an Excel file available on the MetOp Data server under the
    following directory:
    /2009_CVF_data/CVF_Reports/AMSA_trend/AMSA_DATA_FILE

-   The HIRS Filter Wheel re-synch period during this reporting period
    averaged between 97-99 seconds between resynchs. 

>  

[Anomalies]{.underline}

-   **AR10693, "AMSU-A1 Channel 7 NEdT":**  EUMETSAT has raised an
    anomaly report to document the increased noise in Channel 7.  Since
    mid December 2008, the increasing trend has become steeper and is
    currently at 0.39 K and climbing.  An ARB telecon was held on
    January 15.  The NOAA SOCC raised a SOAR on Jan. 23
    (SOAR-METOP-A-0014), which should now allow NASA and Northrop
    Grumman to support with root cause investigations. See Figures 5 &
    6.

 

[Operations Performed]{.underline}

-   The SEM IFCs were run on their regular Tuesday schedule, with the
    TED IFC starting on Jan. 27 at 08:01:14 UTC and the MEPED IFC
    starting at 08:02:34 UTC. 

-   HRPT operations continued in toggling mode, operating on the HRPT
    B-side and only operating in northern hemisphere low risk zones
    during descending passes (i.e. over northern Europe and the northern
    Atlantic).

>  

[Operations Planned]{.underline}

-   The next SEM IFCs are planned for Tue., Feb.3.

-   EUMETSAT have completed their flight control procedure updates for
    the Feb. 1 decommissioning of the SARR 121.5 and 243 MHz receivers. 
    A telecon was held on Jan. 22 with DND, EUM and the SOCC to discuss
    comments to the procedures and to coordinate support on Feb.1.  EUM
    have since made a few minor updates to the procedures regarding
    telemetry checks, have re-run these on their simulator and have
    provided the updated procedures and simulator logs to NOAA and DND. 
    NOAA SARSAT (Mickey Fitzmaurice) confirms that the operational LUT
    at NSOF will be used on the first pass seen locally (approx. 01:25
    UTC) to verify via frequency spectrum plots that the outputs from
    the two receivers have been successfully disconnected and the 406
    MHz channel is still operating nominally.  Mickey will contact EUM
    by phone immediately following NSOF confirmation of channel output
    switch-off and follow-up with e-mail distribution of the spectrum
    plots.

![](media/image4.jpeg){width="9.260416666666666in"
height="6.354166666666667in"}Figure 5: MetOp-A AMSU A1 Channel 7 Gain

![](media/image5.jpeg){width="9.208333333333334in"
height="6.177083333333333in"}

Figure 6: MetOp-A AMSU A1 Channel 7 NEdT