Subject: Planned UARS Instrument Operations

From: "UMPG::NEFF"@PEM.space.swri.edu
Date: Tue, 27 Jun 1995 15:53:12 GMT

UARS FOT MEMO No. 95-041, which follows, contains a table
showing tentative days for operation of individual UARS instruments
from day 95181 (June 30) to day 95237 (August 25).  Yaw maneuvers
are scheduled for June 30 (forward to backward) and July 30 
(backward to forward).

Bob Neff

                         UARS FOT MEMO NO. 95-041

                              26 June 1995

     TO:   Distribution

   FROM:   Rich Calvin, UARS FOT

SUBJECT:   Planned Instrument Operations For Yaw Maneuver #39

   FILE:   Memos.95-041/Inst. Ops

A meeting was held on 23 June 1995 to discuss a preliminary plan for 
Instrument reactivation after the Yaw Around maneuver on 30 June (DOY 
181).  Attendees included Mark Schoeberl, Anne Douglass and Charley 
Jackman from Code 916; Bob Neff from the MPG plus John Speer and 
Rich Calvin from the UARS FOT.

UARS can only support a limited compliment of Instruments in a science 
data collection mode because of the parked solar array (positioned at 300 
degrees) and the current battery performance.
  
Based on historical battery performance data, a schedule was developed to 
maximize instrument operation during the period beginning GMT Day 183 
through Day 273.  This schedule is intended to ensure a positive energy 
balance on the power system and preclude anomalous battery behavior.  
Also, power system performance during this period will be used to develop 
future schedules.

All operating Instruments (HALOE, ACRIM, SOLSTICE and SUSIM) will be 
disabled (survival heaters enabled) prior to the Yaw Around maneuver on 
Day 181 as a precaution to preclude power conditions experienced at the 
end of the previous maneuver.

The following table displays the estimated days of operation for each of 
the UARS Instruments:

 Instrument               Days of Operation (DOY)
   ACRIM                 184-211, 213-237
   HALOE                 188-205, 211-227
   HRDI (if possible)    185-211
   MLS                   183-188, 205-211, 227-237
   PEM (if possible)     186-211, 215-237
   SOLSTICE              184-211, 213-237
   SUSIM                 184-211, 213-237
   WINDII (if possible)  214-237

All activation dates for the instruments are depended upon battery 
performance and Beta angles.  All estimated days of operation begin and 
end at 00:00:00 UTC of the days indicated with expected overlap between 
HALOE and MLS.  This schedule was deemed the most efficient scenario 
based on past activation data and daily load generation and it allows the 
maximum science collection.

Distribution:  E. Macie, Code 513
               Mark Schoeberl, Code 916
               A. Douglass, Code 916
               C. Jackman, Code 916
               B. Neff, UARS MPG
               J. Speer, UARS FOT/519.8 
               On-Line Clipboard 
               File

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