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A simulation study of the thermosphere mass density response to substorms using GITM
dc.contributor.authorLiu, Xianjingen_US
dc.contributor.authorRidley, Aaronen_US
dc.date.accessioned2015-11-12T21:04:22Z
dc.date.available2016-11-01T16:43:14Zen
dc.date.issued2015-09en_US
dc.identifier.citationLiu, Xianjing; Ridley, Aaron (2015). "A simulation study of the thermosphere mass density response to substorms using GITM." Journal of Geophysical Research: Space Physics 120(9): 7987-8001.en_US
dc.identifier.issn2169-9380en_US
dc.identifier.issn2169-9402en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/115970
dc.description.abstractThe temporal and spatial variations of the thermospheric mass density during a series of idealized substorms were investigated using the Global Ionosphere Thermosphere Model (GITM). The maximum mass density perturbation of an idealized substorm with a peak variation of hemispheric power (HP) of 50 GW and interplanetary magnetic field (IMF) Bz of −2 nT was ~14% about 50 min after the substorm onset in the nightside sector of the auroral zone. The mass density response to different types of energy input has a strong local time dependence, with the mass density perturbation due to only an IMF Bz variation peaking in the dusk sector and the density perturbation due to only HP variation peaks in the nightside sector. Simulations with IMF Bz changes only and HP changes only showed that the system behaves slightly nonlinearly when both IMF and HP variations are included (a maximum of 6% of the nonlinearity) and that the nonlinearity grows with energy input. The neutral gas heating rate due to Joule heating was of same magnitude as the heating rate due to precipitation, but the majority of the temperature enhancement due to the heating due to precipitation occurs at lower altitude as compared to the auroral heating. About 110 min after onset, a negative mass density perturbation (~−5%) occurred in the night sector, which was consistent with the mass density measurement of the CHAMP satellite.Key PointsMass density response to different types of energy input has strong local time dependenceNegative mass density perturbation (~−5%) occurred in the night sector during storm recover phaseMass density responses to different types of energy source are nearly a linear systemen_US
dc.publisherAcademicen_US
dc.publisherWiley Periodicals, Inc.en_US
dc.subject.otherGITM modelingen_US
dc.subject.otherJoule heatingen_US
dc.subject.otherhemisphere poweren_US
dc.subject.othersubstormsen_US
dc.subject.othermass density perturbationen_US
dc.titleA simulation study of the thermosphere mass density response to substorms using GITMen_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelAstronomy and Astrophysicsen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/115970/1/jgra52067_am.pdf
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/115970/2/jgra52067.pdf
dc.identifier.doi10.1002/2014JA020962en_US
dc.identifier.sourceJournal of Geophysical Research: Space Physicsen_US
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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