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Are Solar Energetic Particles an Accelerated Sample of Solar Wind?

Mewaldt, R. A. and Cohen, C. M. S. and Leske, R. A. and Christian, E. R. and Cummings, A. C. and Stone, E. C. and von Rosenvinge, T. T. and Wiedenbeck, M. E. (2001) Are Solar Energetic Particles an Accelerated Sample of Solar Wind? In: Proceedings of the 27th International Cosmic Ray Conference. Vol.8. Copernicus Systems and Technology GmbH , Berlin, Germany, pp. 3132-3135.

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In the current picture of gradual solar energetic particle (SEP) events, the acceleration is believed to take place at a shock driven by a coronal mass ejection as it moves through the corona and out into the solar wind. It is often assumed that the solar wind provides the seed particles that are accelerated and later observed at 1 AU. We compare solar energetic particle and solar wind composition measurements, focusing on a comparison of the fractionation patterns with respect to first ionization potential. On the basis of several significant differences between the solar wind and SEP compositions, we conclude that most SEPs with energies >5 MeV/nucleon are not simply an accelerated sample of solar wind. Rather, SEPs and fast and slow solar wind appear to be distinct samples of coronal material with significantly different fractionation patterns. This implies that solar energetic particles must be accelerated within a few solar radii of the Sun.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Mewaldt, R. A.0000-0003-2178-9111
Cohen, C. M. S.0000-0002-0978-8127
Leske, R. A.0000-0002-0156-2414
Christian, E. R.0000-0003-2134-3937
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© Copernicus GmbH. This work was supported by NASA at the California Institute of Technology (under grant NAS5-6912), the Jet Propulsion Laboratory, and Goddard Space Flight Center.
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2001-47
Record Number:CaltechAUTHORS:20150303-110535538
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55463
Deposited By: Deborah Miles
Deposited On:05 Mar 2015 01:04
Last Modified:09 Mar 2020 13:19

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