EARTH PROBE TOMS
MISSION COVERAGE PERIOD: 1996 to Present

EP/TOMS was launched into a 500 km sun synchronous orbit on 
July 2, 1996.  The first EP/TOMS Earth scan data were observed 
during orbit 216 on July 16, 1996.  Normal science operations
began during orbit 339 on July 24, 1996.  Orbits prior to 7903
(December 4, 1997) were at the initial 500 km altitude.  Orbits
after 8037 (December 13, 1997) were at 740 km altitude (local 
equator crossing time of 11:20 AM).
          
No Earth scan science data (and therefore no Level 2 data) were 
acquired for 477 orbits in the orbit 216-18233 range (see Table 1).
Seventy-two (72) of these orbits were before the start of 
normal operations.
          
Table 2 lists 62 orbits that have incomplete daytime data 
coverage.  Nine (9) of these orbits were prior to normal operations.
          
Table 3 lists orbits that have some fixed scene view ("stare mode")
data that interrupts the usual continuous daytime Earth scan data.
Each affected orbit has a minimum 3 minute Level 2 data gap.
  
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                         Table 1
           EP/TOMS Orbits with No Level 2 Data 
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July     17-19, 1996: 220, 228, 233-263
July     22-24, 1996: 300-338  (all before normal operations)
November    28, 1996: 2258
November 16-19, 1997: 7640-7675  (attitude anomaly)
December  4-13, 1997: 7903-8037  (orbit boost)
November 17-18, 1998: 12935-12951  (Leonid meteors)
December 13, 1998-January 2, 1999: 13311-13609  (s/c anomaly)
(Orbit 13610 is not archived due to low instrument temperature)
November 17-18, 1999: 18209-18225  (Leonid meteors)
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                         Table 2
          EP/TOMS Orbits with Partial Level 2 Data
          (percent available shown in parenthesis)
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July      16, 1996: 216 (84%), 219 (61%)
July      17, 1996: 221 (40%), 227 (61%), 229 (40%), 232 (29%)
July      19, 1996: 264 (39%)
July      22, 1996: 299 (12%)
July      24, 1996: 339 (40%)    (all before normal operations)
October    9, 1996: 1505 (64%), 1506 (80%) 
November  28, 1996: 2257 (38%), 2259 (62%)   
December  31, 1996: 2773 (77%) 
March      9, 1997: 3794 (65%)
November  16, 1997: 7639 (41%)
November  19, 1997: 7676 (60%)
December   4, 1997: 7902 (38%)
December  13, 1997: 8038 (67%)
April     14, 1998: 9807 (82%)
May        1, 1998: 10045 (75%)
May       12, 1998: 10212 (96%), 10213-10216 (38% each)
May       13, 1998: 10217-10223 (38% each), 10224 (40%)
May       19, 1998: 10312 (99%)
May       20, 1998: 10327 (98%)
May       24, 1998: 10376 (61%), 10377 (39%)
June      14, 1998: 10675 (99%)
July      21, 1998: 11220 (99%)
August    23, 1998: 11692 (99%)
September 24, 1998: 12155 (99%)
October   15, 1998: 12459 (99%)
October   29, 1998: 12663 (99%)
October   31, 1998: 12737 (99%)
November   5, 1998: 12760 (98%)
November   6, 1998: 12780 (97%)
November  17, 1998: 12934 (40%)
November  18, 1998: 12952 (61%)
November  25, 1998: 13051 (99%)
December   1, 1998: 13144 (99%)
December   8, 1998: 13237 (99%)
December  10, 1998: 13279 (99%)
December  13, 1998: 13310 (37%)
January    3, 1999: 13610 (63%), 13617 (99%) 
January   11, 1999: 13738 (99%)
March      2, 1999: 14454 (99%), 14455 (99%)
November  17, 1999: 18208 (39%)
November  18, 1999: 18226 (62%)

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                         Table 3 
    EP/TOMS Orbits with Fixed Scene ("stare mode") Data 
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April  1, 1997: 4152
April  2, 1997: 4167
April  6, 1997: 4228, 4230
April 11, 1997: 4306
April 15, 1997: 4367
April 16, 1997: 4382
April 20, 1997: 4443
April 21, 1997: 4458
April 25, 1997: 4519
April 30, 1997: 4595
May    4, 1997: 4656
May    5, 1997: 4671
May    8, 1997: 4717
May    9, 1997: 4732
May   10, 1997: 4747
May   13, 1997: 4793
May   14, 1997: 4808
May   18, 1997: 4869
May   19, 1997: 4884  
May   23, 1997: 4945
May   27, 1997: 5006
May   28, 1997: 5021
June   1, 1997: 5082
June   2, 1997: 5097
June   5, 1997: 5143
June   6, 1997: 5158
June   7, 1997: 5173
June  10, 1997: 5219
June  11, 1997: 5233, 5234
June  12, 1997: 5240, 5250
June  14, 1997: 5277, 5280
June  15, 1997: 5295
June  16, 1997: 5309, 5310
June  17, 1997: 5316, 5326
June  19, 1997: 5353, 5356
June  20, 1997: 5371
June  21, 1997: 5386
June  24, 1997: 5432
June  25, 1997: 5446, 5447
June  28, 1997: 5493
June  29, 1997: 5508
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Since the beginning of normal operations 97.79% of the possible daytime  
data are contained in the Level 2 dataset (420.90 orbits missing  
out of 19051 (19389-339+1)).

                 - Bill Byerly  /  Raytheon ITSS  /  February 7, 2000