Journal
ASTROPHYSICAL JOURNAL
Volume 701, Issue 2, Pages 1753-1764Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/701/2/1753
Keywords
acceleration of particles; interplanetary medium; shock waves; Sun: coronal mass ejections (CMEs); Sun: particle emission
Categories
Funding
- NASA [NNX09AF28G, NNX08AQ02G, LWS04-0000-0076, SHP04-0016-0024, NNX08AE34G]
- NASA [119240, NNX09AF28G, 102959, NNX08AE34G] Funding Source: Federal RePORTER
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We have focused primarily on the 2001 September 24 solar energetic particle (SEP) event to verify previous indications of the presence of an outer reflecting boundary of SEPs. By using energetic electron and ion data obtained from multi-spacecraft observations, we have identified a collimated particle beam consisting of reflected particles returning from an outer boundary. The peak of reflected particles appears before the arrival of particles at 90 degrees. pitch angle. In addition, an onset time analysis is carried out in order to determine parameters characterizing the boundary. Our analysis suggests that the presence of a counter-streaming particle beam with a deep depression at similar to 90 degrees. pitch angle during the onset phase is evidence for a nearby reflecting boundary. We have compared this property in the SEP events of 2002 April 21 and August 24. A reflecting boundary that blocks a flux tube is important in space weather forecasting since it can cause the reservoir effect that may enhance the intensity and duration of high-energy particles.
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