Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 29, Issue 24, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2002GL015652
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[1] Solar wind protons detected within Magnetic Holes (MHs) and Magnetic Decreases (MDs) are found to be preferentially heated perpendicular to (B) over right arrow (0). The MHs/MDs are associated with the phase-steepened edges of nonlinear Alfven waves. The proton anisotropies can lead to the proton cyclotron and mirror mode plasma instabilities. We examine the Ponderomotive Force (PF), a phenomenon due to wave pressure gradients, and show that for this plasma regime and for phase-steepened Alfven waves, the PF proton acceleration/energization will primarily be orthogonal to B-0. It is suggested that accelerated ions create the MHs/MDs by a diamagnetic effect.
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