ACA high background: correlation with solar array angle and momentum dumps

Solar array angle

A plot of the solar array angle at the time of ACA high background events shows that there is no strong correlation. The plots below show the SA angle versus time and versus the "strength" of the high-background event. There is a slight hint that in recent years the high-background events occur less frequently at mid-range pitch angles, but the statistics are not conclusive.

Momentum Dumps

"Strong" events (strength >= 50)


Hi Bgd Time       Strength   Mom Dump Time      A1     A2     A3     A4   Delta_T
-----------------  ------  -----------------  -----  ------ -----  -----  -------
2001:111:00:25:36   737.9  2001:100:01:35:01   433     0     540    117     1    
2001:126:13:08:46   660.0  2001:126:12:05:02   355     0     740    240     1 hr
2001:126:22:17:36   344.4  2001:126:12:05:02   355     0     740    240    10 hr
2001:176:19:12:16    65.6  2001:070:23:43:01    0     124    320    282     6
2001:182:10:27:16   399.7  2001:167:11:00:02    0     720    342    365    15 
2001:182:10:32:26   153.7  2001:167:11:00:02    0     720    342    365    15 
2001:185:02:23:06   299.3  2001:185:01:50:02   940     0     177    625    < 1 hr	
2001:202:22:01:46   305.4  2001:202:21:20:02    0     437    1160   156    < 1 hr
2002:125:09:48:36    65.6  2002:104:17:17:02   31      0     327    860    21 
2002:213:03:43:06    98.4  2002:178:04:50:08    0     326    860    473    35
2002:220:01:10:36    84.0  2002:178:04:50:08    0     326    860    473    42
2002:258:09:54:06    61.5  2002:254:00:15:02    0     60     568    680     4
2003:088:04:03:26   789.2  2003:015:16:36:29   2951   463     0     2525   73
2003:174:18:05:26   293.1  2003:163:13:26:32   867     0     783    1060   11
2004:123:23:40:36    69.7  2004:089:18:16:39   421     0     740    430    34    

"Weak" events (strength < 50)

Hi Bgd Time       Strength   Mom Dump Time      A1     A2     A3     A4   Delta_T
-----------------  ------  -----------------  -----  ------ -----  -----  -------
2002:361:19:20:16    12.3  2002:356:12:30:03   2080    0     806    1022    5
2003:178:22:24:06    10.2  2003:163:13:26:32   867     0     783    1060   15
2003:190:19:36:56    18.4  2003:163:13:26:32   867     0     783    1060   27
2003:215:15:35:36    47.1  2003:203:15:04:17   236     0     584    1180   12
2004:013:07:10:56    16.4  2003:301:11:19:58   1380   484     0     893    27
2004:033:07:05:46    18.4  2003:301:11:19:58   1380   484     0     893    97
2004:104:12:39:26    22.5  2004:089:18:16:39   421     0     740    430    15




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Last modified:12/27/13