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Combined first and second order Fermi acceleration at comets

dc.contributor.authorGombosi, Tamas I.en_US
dc.contributor.authorLorencz, K.en_US
dc.contributor.authorJokipii, J. R.en_US
dc.date.accessioned2006-04-07T20:58:26Z
dc.date.available2006-04-07T20:58:26Z
dc.date.issued1989en_US
dc.identifier.citationGombosi, T. I., Lorencz, K., Jokipii, J. R. (1989)."Combined first and second order Fermi acceleration at comets." Advances in Space Research 9(3): 337-341. <http://hdl.handle.net/2027.42/28182>en_US
dc.identifier.urihttp://www.sciencedirect.com/science/article/B6V3S-472BKF3-NP/2/749e37e44a101c514eb74196d1ec4d72en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/28182
dc.description.abstractOur two-dimensional, time-dependent model calculations indicate that an interplay between velocity and spatial diffusion may be responsible for the acceleration of implanted heavy ions in the cometary preshock region. Velocity diffusion (second order Fermi acceleration) accelerates the pickup ions to moderate energies thus creating a seed population for the more efficient diffusive-compressive shock acceleration. Solar wind convection limits the time available for diffusive-compressive acceleration, therefore the resulting energy spectrum above 100 keV is a power law with a spectral index of 5 - 6, a value which is in reasonably good agreement with observations.en_US
dc.format.extent515852 bytes
dc.format.extent3118 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.language.isoen_US
dc.publisherElsevieren_US
dc.titleCombined first and second order Fermi acceleration at cometsen_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelAtmospheric, Oceanic and Space Sciencesen_US
dc.subject.hlbsecondlevelAerospace Engineeringen_US
dc.subject.hlbtoplevelScienceen_US
dc.subject.hlbtoplevelEngineeringen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumSpace Physics Research Laboratory, Department of Atmospheric, Oceanic and Space Sciences, The University of Michigan, Ann Arbor, Michigan 48109, U.S.A.; Space Physics Research Laboratory, Department of Atmospheric, Oceanic and Space Sciences, the University of Michigan, Ann Arbor, Michigan 48109, U.S.A.en_US
dc.contributor.affiliationotherCentral Research Institute for Physics, Hungarian Academy of Sciences, Budapest, P.O. Box 49, Hungary 1525en_US
dc.contributor.affiliationotherDepartments of Astronomy and Planetary Sciences, The University of Arizona, Tucson, Arizona 85721, U.S.A.en_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/28182/1/0000634.pdfen_US
dc.identifier.doihttp://dx.doi.org/10.1016/0273-1177(89)90285-8en_US
dc.identifier.sourceAdvances in Space Researchen_US
dc.owningcollnameInterdisciplinary and Peer-Reviewed


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