CaltechAUTHORS
  A Caltech Library Service

A survey of anisotropic energetic particle flows observed by STEREO

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. http://resolver.caltech.edu/CaltechAUTHORS:20130625-131632943

[img]
Preview
PDF - Published Version
See Usage Policy.

2067Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20130625-131632943

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
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.4811029DOIArticle
http://link.aip.org/link/doi/10.1063/1.4811029PublisherArticle
ORCID:
AuthorORCID
Cohen, C. M. S.0000-0002-0978-8127
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.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASASA2715-26309
University of California BerkeleyUNSPECIFIED
NASANAS5-03131
NASANNX08AK87G
Subject Keywords:Solar energetic particles, anisotropies, STEREO
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2013-19
Classification Code:PACS: 96.50.-e, 96.50.sh, 96.50.Vg
Record Number:CaltechAUTHORS:20130625-131632943
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130625-131632943
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
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39089
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:26 Jun 2013 14:38
Last Modified:08 Sep 2017 22:31

Repository Staff Only: item control page