Leske, R. A. and Cohen, C. M. S. and Dotson, B. and Mewaldt, R. A. and Cummings, A. C. and Labrador, A. W. and Stone, E. C. and Wiedenbeck, M. E. and Christian, E. R. and von Rosenvinge, T. T.
(2013)
A survey of anisotropic energetic particle flows observed by STEREO.
In:
Solar Wind 13: Proceedings of the Thirteenth International Solar Wind Conference.
AIP Conference Proceedings.
No.1539.
American Institute of Physics
, Melville, NY, pp. 227-230.
ISBN 978-0-7354-1163-0.
https://resolver.caltech.edu/CaltechAUTHORS:20130625-131632943
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Abstract
The Low Energy Telescopes (LETs) onboard the twin STEREO spacecraft have been measuring the anisotropies of energetic particles since before the beginning of solar cycle 24. Large unidirectional anisotropies often appear at the onset of magnetically well-connected solar energetic particle (SEP) events, suggesting beamed particles with relatively little scattering. Also, long-lasting bidirectional flows are seen during the decay phase of several SEP events. Some of these instances appear to be within interplanetary coronal mass ejections (ICMEs), as indicated by characteristics such as magnetic field rotations or bidirectional suprathermal electrons. We present preliminary findings from a survey of LET proton anisotropy observations, which illustrate that bidirectional flows appear more likely to come from directions far from the nominal Parker spiral direction than do unidirectional beams, consistent with previous studies. Individual cases that show unusual intensity depletions perpendicular to the magnetic field or pitch angle distributions otherwise indicative of magnetic mirroring are presented in more detail.
Item Type: | Book Section |
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Additional Information: | © 2013 AIP Publishing LLC.
This work was supported by the National Aeronautics
and Space Administration (NASA) at Caltech and JPL
under sub-contract SA2715-26309 from the University
of California at Berkeley under NASA contract NAS5-
03131, and by NASA award NNX08AK87G. We thank
the MAG investigators on STEREO formaking their data
publicly available. |
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Group: | Space Radiation Laboratory |
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Funders: | Funding Agency | Grant Number |
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NASA | SA2715-26309 | University of California Berkeley | UNSPECIFIED | NASA | NAS5-03131 | NASA | NNX08AK87G |
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Subject Keywords: | Solar energetic particles, anisotropies, STEREO |
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Other Numbering System: | Other Numbering System Name | Other Numbering System ID |
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Space Radiation Laboratory | 2013-19 |
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Series Name: | AIP Conference Proceedings |
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Issue or Number: | 1539 |
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Classification Code: | PACS: 96.50.-e, 96.50.sh, 96.50.Vg |
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DOI: | 10.1063/1.4811029 |
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Record Number: | CaltechAUTHORS:20130625-131632943 |
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Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20130625-131632943 |
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Official Citation: | A survey of anisotropic energetic particle flows observed by STEREO
R. A. Leske, C. M. S. Cohen, B. Dotson, R. A. Mewaldt, A. C. Cummings, A. W. Labrador, E. C. Stone, M. E. Wiedenbeck, E. R. Christian, and T. T. von Rosenvinge, AIP Conf. Proc. 1539, 227 (2013), DOI:10.1063/1.4811029
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Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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ID Code: | 39089 |
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Collection: | CaltechAUTHORS |
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Deposited By: | INVALID USER |
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Deposited On: | 26 Jun 2013 14:38 |
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Last Modified: | 09 Nov 2021 23:42 |
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