Mazur, J. E. and Mason, G. M. and Dwyer, J. R. and Giacalone, J. and Jokipii, J. R. and Stone, E. C.
(2000)
Interplanetary magnetic field line mixing deduced from impulsive solar flare particles.
Astrophysical Journal Letters, 532
(1).
L79-L82.
ISSN 2041-8205.
doi:10.1086/312561.
https://resolver.caltech.edu/CaltechAUTHORS:20140826-155628053
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Abstract
We have studied fine-scale temporal variations in the arrival profiles of ~20 keV nucleon^(-1) to ~2 MeV nucleon^(-1) ions from impulsive solar flares using instrumentation on board the Advanced Composition Explorer spacecraft at 1 AU between 1997 November and 1999 July. The particle events often had short-timescale (~3 hr) variations in their intensity that occurred simultaneously across all energies and were generally not in coincidence with any local magnetic field or plasma signature. These features appear to be caused by the convection of magnetic flux tubes past the observer that are alternately filled and devoid of flare ions even though they had a common flare source at the Sun. Thus, we have used the particles to study the mixing of the interplanetary magnetic field that is due to random walk. We deduce an average timescale of 3.2 hr for these features, which corresponds to a length of ~0.03 AU.
| Item Type: | Article |
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| Additional Information: | © 2000 The American Astronomical Society.
Received 1999 December 9; accepted 2000 February 3; published 2000 March 2.
We thank the many members of the ACE instrument teams
who have contributed to the success of the ACE mission, and
we acknowledge the special efforts of R. E. Gold and S. M.
Krimigis. We thank C. Smith and the ACE/MAG team for the
ACE magnetic field measurements reported here, and we thank
D. McComas, R. Skoug, and the ACE/SWEPAM team for the
solar wind measurements used in the analysis. This work was
supported by a contract (Q295801) between the University of
Maryland and The Aerospace Corporation. This work was also
supported by NASA grant PC 251429. J. Gicalone and J. R.
Jokipii acknowledge the support of NASA grants NAG5-7793
and NAG5-6620 and NSF grant ATM 9616547. |
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| Group: | Space Radiation Laboratory |
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| Funders: | | Funding Agency | Grant Number |
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| Aerospace Corporation | Q295801 | | NASA | PC 251429 | | NASA | NAG5-7793 | | NASA | NAG5-6620 | | NSF | ATM 9616547 |
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| Subject Keywords: | acceleration of particles; interplanetary medium; Sun: flares; Sun: particle emission |
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| Other Numbering System: | | Other Numbering System Name | Other Numbering System ID |
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| Space Radiation Laboratory | 2000-41 |
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| Issue or Number: | 1 |
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| DOI: | 10.1086/312561 |
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| Record Number: | CaltechAUTHORS:20140826-155628053 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140826-155628053 |
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| Official Citation: | Interplanetary Magnetic Field Line Mixing Deduced from Impulsive Solar Flare Particles
J. E. Mazur et al. 2000 ApJ 532 L79 |
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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: | 48950 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: | INVALID USER |
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| Deposited On: | 29 Aug 2014 22:46 |
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| Last Modified: | 10 Nov 2021 18:38 |
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