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Local modulation and trapping of energetic particles by coherent magnetic structures
Author(s) -
Tessein Jeffrey A.,
Ruffolo David,
Matthaeus William H.,
Wan Minping
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl068045
Subject(s) - physics , intermittency , magnetosphere , magnetic reconnection , context (archaeology) , magnetic flux , solar wind , trapping , computational physics , magnetic field , particle acceleration , classification of discontinuities , flux (metallurgy) , interplanetary magnetic field , mechanics , quantum mechanics , paleontology , ecology , materials science , turbulence , metallurgy , biology , mathematical analysis , mathematics
Recent observational studies show strong statistical associations between features of interplanetary suprathermal energetic particle (EP) data and rapid changes in the interplanetary vector magnetic field. The latter are connected to intermittency and coherent magnetic structures, including classical discontinuities. Here we discuss these observations in the context of two appealing theoretical ideas: First, magnetic structures bounding flux tubes can cause local or temporary topological trapping, thus influencing EP transport. Second, charged particles may be accelerated by interacting with dynamic flux tubes, either through reconnection, trapping in secondary islands, or a betatron mechanism. We present observations that support interpretation in terms of trapping boundaries associated with changes in EP flux and also find a case in which an EP peak lies near a coherent magnetic structure that is not a shock, with changing particle anisotropy consistent with outflow from the structure, suggestive of local particle acceleration.