# Aqua Teleconference July 3, 2003

**On the phone:**

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

*Instruments*: Roy Spencer, Elena Lobl, Vince Salomonson, Mous Chahine,
Tom Pagano, Bruce Wielicki

*ESMO*: Angie Kelly, Rory Casey

*Data*: Robert Wolfe, Skip Reber, Yun-Chi Lu

### 

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

[Spacecraft]{.underline}: status = green

*Open items:*

• Propulsion system

Variations in over- and under-burn have occurred, impacting drag make-up
maneuver planning. Not necessarily an anomaly, but want to better
understand and factor into delta-inclination plan.

## • Solar Array Drive Assembly (SADA) potentiometer anomaly

Noise observed on potentiometers (2) used to measure angle at which
solar array is rotated; important for recovery from sun pointing
survival mode. Investigating impact if one or both fail. No operations
currently impacted, but needs to be understood before deep space
maneuver. Flight SW modifications will likely be required.

[Instruments]{.underline}: status = yellow (due to HSB)

#### • HSB 

Status=Red, in survival mode since Feb. 5. Anomaly description: position
error on motor detected (typically self-correcting) with no motor
redundancy. Nine different turn-on tests since mid March have all been
unsuccessful.

HSB Anomaly Closeout Review scheduled for July 9 at GSFC.

[Data capture/L0 processing]{.underline}: status = green (99.96% capture
rate through 6/30)

GSFC DAAC experienced a problem with data corruption of their archive
for the time period 28 May 2003 0000Z to 12 June 2003 2359Z. Completed
expedited reprocessing for all instruments on Terra/Aqua where data
processing is performed or dependent on data from the GES DAAC;
redelivered data within 48 hours.

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

> • MODIS lunar cal, 6/10
>
> • Drag make-up maneuver (#11), 6/12
>
> • MODIS lunar cal, 7/9 (132/0547--0613 UTC)
>
> • Implement delta inclination (Delta-i) slew to appropriate attitude
> (but no burn), 7/30
>
> *Might shift to early August to accommodate the large change in
> semi-major axis (SMA) caused by the -76 degree slew on thrusters with
> no delta-i burn. Alternative slew angles are being considered (-90 to
> -108) to counteract the change in SMA. Level of difficulty is no more
> complex than other inclination maneuvers. Simulations have been
> completed.*
>
> • MODIS lunar cal, Aug.-Sept. timeframe, TBD
>
> • Drag make-up maneuver, Aug.- Sept. timeframe, TBD
>
> • Delta-i maneuver, Oct. 2
>
> • MODIS lunar cal, Oct. timeframe, TBD
>
> • Drag make-up maneuver, Oct. timeframe, TBD
>
> *Note*: orbit maintenance and lunar cal maneuver timeline history
> charts are detailed in ppt attachment.

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

### Aqua Science Working Group meeting talks

Electronic talks from all sessions have been placed on the Aqua web site
at (hidden site):

<http://aqua.nasa.gov/presentations_hidden.html>

[Data imagery and archive status:]{.underline}

Reminder that links to (1) browse and quicklook imagery, (2) summary
information on archived data status have been placed in the "images &
data" section of the Aqua web site:
<http://www.aqua.nasa.gov/imagesanddata.html>. Please forward any
updates or corrections to Steve Platnick.

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

All DAAC on line data pools operating well.

GSFC DAAC archive corruption (May 28-June 12) was a cache size limit
problem. Cache size has now been limited to prevent conflicts with
existing 3^rd^ party software. New software update will allow increase
in cache.

**Science Working Group for Data -- SWGD (Wolfe):**

SWG for Data Workshop scheduled for Sept. 9,10 in GSFC area. Will
emphasize user directed panels to discuss data uses and acquisition
difficulties, etc.

**CERES: (Wielicki)**

Instruments are operating nominally. ERBE-like TOA fluxes expected the
end of August. Terra azimuthal distribution models (ADM's) are expected
the end of September. Will be used as initial ADM's for Aqua. DAO GEOS 4
skin surface temperature accuracy now expected to be equal to or better
than ECMWF accuracy. CERES team will be testing.

Very excited to see S'Cool education program featured on the cover of
BAMS (Kudos to Lin Chambers et al.).

Was recently "unofficially" informed that CERES will be able to fly on
NPP. This will allow for continuity of CERES CDRs. NPP currently
scheduled to launch end of 2006.

**MODIS (Salomonson):**

The Terra solar diffuser screen is stuck in the down position (between
sun and diffuser), position used for lower reflectance ocean bands.
Investigating cause of failure; results of study may impact Aqua
operation.

Collection 004 for ocean color being finished up which has implications
for Aqua (which can perhaps begin in November '03).

**AMSR-E (Spencer, Lobl):**

L1A data was released from NASDA on 18 June and is being received by
AMSR-E SIPS at GHCC for processing to L2A. NSIDC is ready to support
distribution of L1A. Note that this data has the NASDA calibration. The
L2A processing will invoke the Wentz calibration.

EL: Current soil moisture (SMEX03) validation activities are going well.
Good flights over Alabama for soil moisture. Aircrafts now in Oklahoma.

RS: New 6.9 GHz calibration issue - brightness temperatures are too
bright. Appears to be non-linearity in detector (can likely be corrected
according to Wentz).

EL: Processing turn-around at SIPS is slower than expected. Mission ops
appears to be weakest link in processing chain (as communicated from
Michael Goodman). AK: goal is to get data out within 3 hrs. which is
being met (\~ 90% of time). EL: will have Goodman contact AK.

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

Level-2 PGE expected to go public in August. Temperature products
looking good; steady improvement with water vapor retrievals. L1B
release for Direct Broadcast has been approved by JPL and, under their
contract, will be delivered to GSFC probably next week.

**Outreach, web site, etc.:**

No report.

**Next Telecon: 8-7-03**

Minutes are being placed on the following site:
[*http://aqua.nasa.gov/minutes*](http://aqua.nasa.gov/minutes).

Corrections/additions should be sent to Steve Platnick.