Ion Pickup by Finite Amplitude Parallel Propagating Alfven Waves

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dc.contributor.author Li, Xing
dc.contributor.author Lu, Q. M.
dc.contributor.author Li, B.
dc.date.accessioned 2008-12-04T15:56:23Z
dc.date.available 2008-12-04T15:56:23Z
dc.date.issued 2007-04-24
dc.identifier.citation Li , X , Lu , Q M & Li , B 2007 , ' Ion Pickup by Finite Amplitude Parallel Propagating Alfven Waves ' The Astrophysical Journal Letters , vol 661 , no. 1 , pp. L105-L108 . , 10.1086/518420 en
dc.identifier.issn 2041-8213
dc.identifier.other PURE: 90207
dc.identifier.other dspace: 2160/1370
dc.identifier.uri http://hdl.handle.net/2160/1370
dc.identifier.uri http://www.journals.uchicago.edu/ApJ/journal/issues/ApJL/v661n1/21478/21478.html en
dc.description Li, Xing; Lu, Q. M.; Li, B., 'Ion Pickup by Finite Amplitude Parallel Propagating Alfven Waves', The Astrophysical Journal Letters (2007) 661(1) pp.L105-L108 RAE2008 en
dc.description.abstract Two scenarios of possible ion heating due to finite amplitude parallel propagating Alfvén waves in the solar atmosphere are investigated using a one-dimensional test particle approach. (1) A finite amplitude Alfvén wave is instantly introduced into a plasma (or equivalently, new ions are instantly created). (2) New ions are constantly created. In both scenarios, ions will be picked up by the Alfvén wave. In case 1, the wave scatters ions in the transverse direction leading to a randomization (or heating) process. This process is complete when a phase shift of ±π in the ion gyrospeed is produced between particles with characteristic parallel thermal speed and particles with zero parallel speed. This corresponds to (k is the wavenumber, and is the ion thermal speed). A ring velocity distribution can be produced for a large wave amplitude. The process yields a mass-proportional heating in the transverse direction, a temperature anisotropy, and a bulk flow along the background magnetic field. In case 2, continuous ion creation represents a continuing phase shift in the ion gyrospeed leading to heating. New particles are picked up by the Alfvén wave within one ion gyroperiod. It is speculated that the mechanism may operate in the chromosphere and active regions where transient events may generate finite amplitude Alfvén waves. en
dc.language.iso eng
dc.relation.ispartof The Astrophysical Journal Letters en
dc.title Ion Pickup by Finite Amplitude Parallel Propagating Alfven Waves en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1086/518420
dc.contributor.institution Institute of Mathematics & Physics (ADT) en
dc.contributor.institution Mathematics and Physics en
dc.description.status Peer reviewed en


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