Evidence for Shock Acceleration of Energetic Particles in the May 2-3, 1998 ICME

Details Evidence for Shock Acceleration of Energetic Particles in the May 2-3, 1998 ICME Evidence for Shock Acceleration of Energetic Particles in the May 2-3, 1998 ICME

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh62a08f&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH62A-08

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2114 Energetic Particles, Heliospheric (7514)

Scientific paper

The May 2-3, 1998 ICME was remarkable in many respects. It contained a long period of enhanced He+ density and it contained periods of both low and high ionization states of Fe. Because this event occurred during a very disturbed period, a conclusive evaluation of its magnetic topology and solar-interplanetary evolution has not been possible. A fortuitous alignment of the interplanetary magnetic field with the orbital plane of Lunar Prospector during this event adds information that helps sort through the various possibilities. Lunar Prospector carried an alpha particle spectrometer having an omnidirectional acceptance of 16400 cm2 s sr MeV in the energy range between 4.1 and 6.7 MeV. Lunar occultation of the alpha flux at this time allowed a determination of its pitch-angle distribution. This distribution was bistreaming with a full width that averaged 52 degrees. This width is close to that of the intense, anti-sunward portion of the suprathermal electron pitch-angle distributions measured simultaneously using the SWEPAM experiment aboard ACE. These electron distributions were also generally bistreaming, but were superimposed on conics some of the time. The total widths of the pitch-angle distributions for 712 eV electrons averaged 56 degrees. Since 712 eV electrons and 5 MeV alpha particles have nearly the same speed, the similar angular widths of their pitch-angle distributions suggests that both populations originated in the same heating event at about 0.6 AU. This location is consistent with acceleration and heating by the shock that passed 1 AU at 17 UT on May 3.

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