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Observations and Interpretations of Energetic Neutral Hydrogen Atoms from the December 5, 2006 Solar Event

Mewaldt, R. A. and Leske, R. A. and Shih, A. Y. and Stone, E. C. and Barghouty, A. F. and Cohen, C. M. S. and Cummings, A. C. and Labrador, A. W. and von Rosenvinge, T. T. and Wiedenbeck, M. E. (2010) Observations and Interpretations of Energetic Neutral Hydrogen Atoms from the December 5, 2006 Solar Event. In: Twelfth International Solar Wind Conference. AIP Conference Proceedings . No.1216. American Institute of Physics , Melville, NY, pp. 592-595. ISBN 978-0-7354-0759-6.

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We discuss recently reported observations of energetic neutral hydrogen atoms (ENAs) from an X9 solar flare/coronal mass ejection event on 5 December 2006, located at E79. The observations were made by the Low Energy Telescopes (LETs) on STEREO A and B. Prior to the arrival of the main solar energetic particle (SEP) event at Earth, both LETs observed a sudden burst of 1.6 to 15 MeV energetic neutral hydrogen atoms produced by either flare or shock-accelerated protons. RHESSI measurements of the 2.2-MeV γ-ray line provide an estimate of the number of interacting flare-accelerated protons in this event, which leads to an improved estimate of ENA production by flare-accelerated protons. Taking into account ENA losses, we find that the observed ENAs must have been produced in the high corona at heliocentric distances ≥ 2 solar radii. Although there are no CME images from this event, it is shown that CME-shock-accelerated protons can, in principle, produce a time-history consistent with the observations.

Item Type:Book Section
Related URLs:
Mewaldt, R. A.0000-0003-2178-9111
Leske, R. A.0000-0002-0156-2414
Stone, E. C.0000-0002-2010-5462
Cohen, C. M. S.0000-0002-0978-8127
Cummings, A. C.0000-0002-3840-7696
Labrador, A. W.0000-0001-9178-5349
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© 2010 American Institute of Physics. Issue Date: 25 March 2010. This work was supported by NASA at Caltech and JPL under sub-contract SA2715-26309 from UC Berkeley under NASA contract NAS5-03131. The work at MSFC was supported by the TEI Program of NASA’s Office of Chief Engineer. We thank NOAA for GOES X-ray data and appreciate discussions with Hugh Hudson, Sam Krucker, Gang Li, Bob Lin, Ron Murphy and Gerry Share.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASA Office of Chief Engineer, TEI ProgramUNSPECIFIED
Subject Keywords:energetic neutral atoms; solar energetic particles; flares; coronal mass ejections
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2010-08
Series Name:AIP Conference Proceedings
Issue or Number:1216
Classification Code:PACS:; 95.55.Fw; 98.58.Ge; 96.50.Bh
Record Number:CaltechAUTHORS:20100921-085601924
Persistent URL:
Official Citation:Observations and Interpretations of Energetic Neutral Hydrogen Atoms from the December 5, 2006 Solar Event R. A. Mewaldt, R. A. Leske, A. Y. Shih, E. C. Stone, A. F. Barghouty, C. M. S. Cohen, A. C. Cummings, A. W. Labrador, T. T. von Rosenvinge, and M. E. Wiedenbeck, AIP Conf. Proc. 1216, 592 (2010), DOI:10.1063/1.3395935
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20057
Deposited By: Tony Diaz
Deposited On:24 Sep 2010 21:41
Last Modified:08 Nov 2021 23:57

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