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Evidence for Remnant Flare Suprathermals In The Source Population of Solar Energetic Particles In The 2000 Bastille Day Event

Tylka, A. J. and Cohen, C. M. S. and Dietrich, W. F. and Maclennan, C. G. and McGuire, R. E. and Ng, C. K. and Reames, D. V. (2001) Evidence for Remnant Flare Suprathermals In The Source Population of Solar Energetic Particles In The 2000 Bastille Day Event. Astrophysical Journal, 558 (1). L59-L63. ISSN 0004-637X. doi:10.1086/323344.

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The energy spectra of Fe in the very large solar energetic particle (SEP) event of 2000 July 14 are strikingly different from those of lighter species. We show that this difference can be explained by shock acceleration from a two-component source population, comprising solar wind suprathermals and a small (∼5%) admixture of remnant flare particles, as previously proposed to explain enhanced ^3He/^4He in some gradual SEP events. Flare remnants can also account for several previously unexplained features of high-energy solar heavy ions as well as important aspects of SEP event-to-event variability. These results offer a new perspective on the enduring controversy over the relative roles of flares and coronal mass ejections (CMEs) in producing SEPs. Flare activity clearly makes a unique and critical contribution to the source population. But the predominate accelerator in large gradual SEP events is the CME-driven shock, and many spectral, compositional, and charge state characteristics of highenergy heavy ions can be understood without invoking other acceleration mechanisms.

Item Type:Article
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URLURL TypeDescription DOIArticle
Cohen, C. M. S.0000-0002-0978-8127
Additional Information:© 2001 The American Astronomical Society. Received 2001 May 24; accepted 2001 July 17; published 2001 August 2. NOAA provided flare and corrected GOES proton data. A. J. T. was supported by the ACE Guest Investigator Program (NASA DPR W19,501), the ISTP Solar Max Extended Science Program (NASA DPR S92662F), and the Office of Naval Research. W. F. D. was supported by the SEC Guest Investigator Program (NASA DPR W19,493).
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Office of Naval Research (ONR)UNSPECIFIED
Subject Keywords:acceleration of particles—shock waves—Sun: coronal mass ejections (CMEs)— Sun: flares—Sun: particle emission
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2001-27
Issue or Number:1
Record Number:CaltechAUTHORS:20150302-155611769
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Official Citation:Evidence for Remnant Flare Suprathermals in the Source Population of Solar Energetic Particles in the 2000 Bastille Day Event A. J. Tylka et al. 2001 ApJ 558 L59
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55434
Deposited By: Deborah Miles
Deposited On:06 Mar 2015 16:32
Last Modified:10 Nov 2021 20:45

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