Adiabatic Deceleration of Cosmic Rays during Interplanetary Magnetic Flux Rope Expansion

Details Adiabatic Deceleration of Cosmic Rays during Interplanetary Magnetic Flux Rope Expansion Adiabatic Deceleration of Cosmic Rays during Interplanetary Magnetic Flux Rope Expansion

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh21a1907k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH21A-1907

Physics

[2111] Interplanetary Physics / Ejecta, Driver Gases, And Magnetic Clouds, [2114] Interplanetary Physics / Energetic Particles, [2134] Interplanetary Physics / Interplanetary Magnetic Fields, [7900] Space Weather

Scientific paper

We have developed models to describe how the GCR density drops during a second-stage Forbush decrease when the detector is inside an interplanetary magnetic flux rope. In addition to the curvature and gradient drifts and mirroring effects on guiding center orbits in the interplanetary magnetic flux rope structure of magnetic clouds, we propose a flux rope expansion model that includes a slow, inhomogeneous radial and axial expansion. Then we derive the adiabatic deceleration of cosmic ray particles due to radial and axial expansion effects. We expect that the deceleration effect reduces the rate of recovery of the GCR flux.

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