Observations of SPE Count rate Oscillations

1
Observations of SPE Count rate Oscillations
19
20
28
29
March 18-20, 2003
October 28, 2002
Possible Explanations SPE inherent
anisotropy Solar Wind / Mars Magnetic Field
Interactions Other?
2
Cooperation within Odyssey and with Mars Global
Surveyor

• MARIE data are potentially useful to the GRS team
  and vice-versa
• GRS detectors clearly see SPEs and do not suffer
  from prolonged data outages
• GRS counter hit rate can fill in some gaps in
  MARIE data
• Mars Global Surveyor Magnetometer data may
  provide additional insight

From W. Boynton

• Sample of GRS Upper Level Discriminator Data
  from October 14
• Direct hits of protons in gamma-detector crystal
• No particle spectrum, but no gaps in time coverage

3
MARIE and GRS ULD Count RateMarch 18/19 2003
90
60
Count rate (arbitrary units)
Odyssey Latitude
30
0
Day of Year 2003
4
MARIE and GRS ULD Smoothed Count RateMarch 18/19
2003
90
60
Count rate (arbitrary units)
Odyssey Latitude
30
0
Day of Year 2003
5
Odyssey on March 18, 2003 (77.68)
90.0
67.5
Odyssey Latitude
45.0
22.5
Day of Year 2003
6
MARIE and GRS ULD Smoothed Count RateOctober 28,
2002
90
60
Count rate (arbitrary units)
Odyssey Latitude
30
0
Day of Year 2002
7
Odyssey on October 28, 2002 (301.278)
Day of Year 2002