# Aqua Teleconference April 3, 2003

**On the phone:**

*Project science*: Claire Parkinson (telecon chair), Steve Platnick,
Steve Graham

*Instruments*: Roy Spencer, Elena Lobl, Dawn Conway, Vince Salomonson,
Mous Chahine, Tom Pagano

*ESMO*: Bill Guit, Angie Kelly

*Data*: Yun-Chi Lu, Skip Reber

*HQ*: Ramesh Kakar

### 

## **Mission Ops (Guit):** see distributed ppt file for details. 

[Spacecraft]{.underline}: green

[Data capture/L0 processing]{.underline}: green

[Planned S/C & Instrument activities]{.underline}:

> MODIS lunar cal, 4/12 (2023 UTC)
>
> Drag make-up maneuver, 4/22 (1443 UTC)

AK: will continue to coordinate with science team to eliminate impact on
validation activities.

#### HSB anomaly

HSB remains in survival mode (since Feb. 5); there remains little hope
for recovery.

Anomaly description: Position error on motor detected (typically
self-correcting). No redundancy for motor. Could result in instrument
loss. Motor design documentation still being tracked down. Issue of
Vishay resistors not being flight worthy being reviewed.

Recent activity: 7 unsuccessful turn-on tests (with various
configurations) have been conducted since mid March (motor current
spikes by several amps and then shuts down); suspect a scan motor
electrical failure. Failure report requested from JPL.

#### MODIS dropped commands

Flight S/W patch expected in progress w/review next week.

## Solar Array Drive Assembly (SADA) potentiometer anomaly

Potentiometers (2) used to measure angle at which solar array is
rotated; important for recovery from sun pointing survival mode. Both
potentiometers have experienced some noise. Investigating impact if
one/both fail. No operations impact currently.

[Aqua inclination adjustment]{.underline}

Adjustment to node local crossing time. Analysis is underway. Current
options: A small single burn this autumn with a one day science
interruption, followed by yearly adjusts. Or, wait until after Aura
launch with an inclination maneuver in March '04; this would require
large multiple (6-8) maneuvers and about a one week science impact.

Team consensus: go with autumn '03 adjustment.

#### Deep space calibration maneuvers

1^st^ Terra deep space calibration (March 26) maneuver was flawless.
2^nd^ maneuver scheduled for April 14 (w/lunar view).

Aqua DSM maneuver suggested for after inclination adjustment maneuver.
Relevant issues: attitude/ephemeris performance since J2000 geolocation
S/W patch and SADA potentiometer anomaly.

[A-train:]{.underline}

Request from CloudSat/CALIPSO for tighter ground track control box (±10
km or ±45 sec vs. ± original 20 km requirement) will result in more drag
maneuvers, exact numbers depending on solar activity (solar cycle --
which will be waning in Aura mission time frame) and control box
tolerance. Estimate through 9/07: an extra 6-7 maneuvers (12-14 hour
loss in science data). Would like to gradually phase into this control
box over the next year.

CP: Note that Aqua might have fuel to remain operational for 15-20
years, instead of having to be brought down shortly after the 6 year
design lifetime (with funding begin the controlling issue).

VS: Terra was tightened up to ±10 km for land observations, if a ±10 km
science need for Terra, probably same for Aqua. BG: True, keep in mind
that Aqua has less stable maneuverability, so more of an issue. Team
consensus: let's go with ±10 km.

RK: Should Japanese be apprised? In a similar vein, have Brazilians been
notified of HSB issues? BG and AK will be responsible for ensuring
dissemination to Brazilians and NASDA.

### **Project science (Parkinson):**

### Terra/Aqua/ACRIM recompetition NRA

Team leader and P.I. proposal lengths extended to 40 pages.

### Aqua Science Working Group meeting & 1 year celebration

Meeting will be May 28,29 at GSFC with team dinner on the 28th.
Tentative agenda:

> Half day: usual ASWG issues (CP chair)
>
> Half day: SST intercomparisons (MC chair)
>
> Half day: MODIS/AIRS cloud mask - current/future efforts and needs;
> Wakasa Bay data set and/or other AMSR-E validation campaign overviews
> if time (SP chair)

Dinner: cost \~\$12 at GSFC rec center. TP: Guest speaker (e.g., Ghasam
Asrar)? CP: Will contact him. VS: if needed as alternative, MODIS has
had some very interesting non-business science/tech speakers in the past
(see David Herring).

[Aqua special issue]{.underline}: In press, should be available this
month (Feb. issue) with 29 papers. CP: Will purchase 1000 issues to be
distributed to science teams, ESMO, international partners, and HQ
program managers. TP: AIRS ordered their own copies (250).

**Data system/EOSDIS (Lu):**

Ingest problems in March have been resolved. System now running
normally.

**Science Working Group for Data -- SWGD:**

Not available.

**CERES:**

Not available.

**MODIS (Salomonson):**

Focusing on loss of band 6 (1.6 µm).

Aqua reprocessing unlikely until after Terra reprocessing (autumn at the
earliest).

**AMSR (Spencer, Lobl, Conway):**

Validation: Colorado campaign was very successful. P-3 back at Wallops.

Will host May 1,2 meeting on S/W and calibration issues at MSFC.

### **AIRS/AMSU/HSB (Chahine, Pagano):**

V2.7 w/Level-1B focus: is running at the GES DAAC and is now public.
V3.0 w/Level-2 focus: final build this week for release in early June
(assumes HSB is available and assumption for AMSU side lobe correction).
Loss of HSB data is "minimal" (have done individual granule
comparisons).

RK: NOAA wants this instrument for future operational sounding, needs to
be a discussion. MC: keep in mind people are using HSB for other uses,
e.g., David Staelin deriving precipitation index up to high latitudes
using HSB. Could AMSR-E be used? RS: would be somewhat degraded w/out
HSB 183 GHz channel.

AIRS STM: May 20,21, 22 at JPL. Further details at the AIRS web site.

**Outreach, web site, etc. (Graham):**

New web site was made active Wednesday 4/2. Spacecraft and other images
from project web site were ported.

**Next Telecon: 5-1-03**