Publication: EFFECT of COHERENT STRUCTURES on ENERGETIC PARTICLE INTENSITY in the SOLAR WIND at 1 AU
Issued Date
2015-10-10
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ISSN
15384357
0004637X
0004637X
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2-s2.0-84946118876
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Mahidol University
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SCOPUS
Bibliographic Citation
Astrophysical Journal. Vol.812, No.1 (2015)
Suggested Citation
Jeffrey A. Tessein, David Ruffolo, William H. Matthaeus, Minping Wan, Joe Giacalone, Marcia Neugebauer EFFECT of COHERENT STRUCTURES on ENERGETIC PARTICLE INTENSITY in the SOLAR WIND at 1 AU. Astrophysical Journal. Vol.812, No.1 (2015). doi:10.1088/0004-637X/812/1/68 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/35882
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Title
EFFECT of COHERENT STRUCTURES on ENERGETIC PARTICLE INTENSITY in the SOLAR WIND at 1 AU
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Abstract
© 2015. The American Astronomical Society. All rights reserved.. We present results from an analysis of Advanced Composition Explorer (ACE) observations of energetic particles in the 0.047-4.78 MeV range associated with shocks and discontinuities in the solar wind. Previous work found a strong correlation between coherent structures and energetic particles measured by ACE/EPAM. Coherent structures are identified using the Partial Variance of Increments (PVI) method, which is essentially a normalized vector increment. The correlation was based on a superposed epoch analysis using over 12 years of data. Here, we examine many individual high-PVI events to better understand this association emphasizing intervals selected from data with shock neighborhoods removed. We find that in many cases the local maximum in PVI is in a region of rising or falling energetic particle intensity, which suggests that magnetic discontinuities may act as barriers inhibiting the motion of energetic particles across them.