Recent STEREO Observations of Solar Energetic Particles

Details Recent STEREO Observations of Solar Energetic Particles Recent STEREO Observations of Solar Energetic Particles

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh31b2005v&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH31B-2005

Astronomy and Astrophysics

Astrophysics

[7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles

Scientific paper

We report on observations of protons in the energy range 14 - 60 MeV and electrons in the range 3 - 7 MeV made by the High Energy Telescopes on the Ahead and Behind STEREO spacecraft. These observations were made from December, 2009 through May, 2011. During this time the position of the Ahead spacecraft varied in heliographic longitude from 64 - 94 degrees west of Earth, while the STEREO Behind spacecraft varied from 67 - 93 degrees east of Earth, i.e. the separation between the two spacecraft varied from 131 to 187 degrees. Approximately 19 solar proton events were observed at Ahead and approximately 24 such events were observed at Behind. Eight of these events were seen at both STEREO spacecraft and three events were associated with solar flares which were directly behind the sun for one of the two spacecraft. Previous observations of ~125 proton events (protons 20 - 80 MeV) reported by Van Hollebeke et al. (1975) included only four events from flares more than 120 degrees from the observer. These two sets of observations appear to be inconsistent. We consider two possible explanations: (1) recent unusually quiet conditions at the Sun and in the solar wind are affecting the particle distributions in longitude or (2) difficulty associating events with active regions behind the solar limb adversely affected the earlier results.

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