Solar energetic particle characteristics and their dependence on longitude in solar cycle 24
Abstract
In previous solar cycles, most studies examining the longitude dependence of solar energetic particle (SEP) event characteristics (such as composition and spectral hardness) have involved statistical analysis of single-point measurements. With the significant separation between the two STEREO and near-Earth spacecraft during solar cycle 24, these SEP characteristics can be examined simultaneously from multiple vantage points. Using SEP measurements from sensors on STEREO and ACE, we have examined the longitude dependence of the Fe/O abundance ratio at 10 MeV/nuc and the oxygen spectral index for energies above 10 MeV/nuc. Longitudinal patterns were sought that support or refute the scenarios put forth by Tylka et al. and Cane et al. to explain the Fe-enriched large SEP events of cycle 23. Unfortunately few Fe-enriched events have occurred in cycle 24 and their longitudinal behavior is not entirely consistent with either of the proposed scenarios.
Additional Information
© 2013 AIP Publishing LLC. This work was supported by NASA under grants NNX11A0756, NNX08AI11G and NNX10AQ68G at Caltech, NNX10AT75G at JHUAPL, subcontracts SA2715-26309 from UC Berkeley (NASA contract NAS5-03131) and by NSF grant AGS-1156004 at Caltech and AGS-1156138 at JHUAPL. We thank Nariaki Nitta for useful discussions regarding solar source identifications.Attached Files
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Additional details
Identifiers
- Eprint ID
- 39166
- Resolver ID
- CaltechAUTHORS:20130701-130656583
Funding
- NASA
- NNX11A0756
- NASA
- NNX08AI11G
- NASA
- NNX10AQ68G
- NASA
- NNX10AT75G
- NASA
- SA2715-26309
- NASA
- NAS5-03131
- NSF
- AGS-1156004
- NSF
- AGS-1156138
Dates
- Created
-
2013-08-12Created from EPrint's datestamp field
- Updated
-
2021-11-09Created from EPrint's last_modified field
Caltech Custom Metadata
- Caltech groups
- Space Radiation Laboratory
- Series Name
- AIP Conference Proceedings
- Series Volume or Issue Number
- 1539
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 2013-20