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Anomalously low geomagnetic energy inputs during 2008 solar minimum

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dc.contributorVirginia Techen
dc.contributor.authorDeng, Yueen
dc.contributor.authorHuang, Yanshien
dc.contributor.authorSolomon, Stanen
dc.contributor.authorQian, Liyingen
dc.contributor.authorKnipp, Deloresen
dc.contributor.authorWeimer, Daniel R.en
dc.contributor.authorWang, Jing-Songen
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessed2014-01-31en
dc.date.accessioned2014-02-05T14:20:23Zen
dc.date.available2014-02-05T14:20:23Zen
dc.date.issued2012-09-01en
dc.description.abstractThe record-low thermospheric density during the last solar minimum has been reported and it has been mainly explained as the consequence of the anomalously low solar extreme ultraviolet (EUV) irradiance. In this study, we examined the variation of the energy budget to the Earth's upper atmosphere during last solar cycle from both solar EUV irradiance and geomagnetic energy, including Joule heating and particle precipitation. The globally integrated solar EUV power was calculated from the EUV flux model for aeronomic calculations (EUVAC) driven by the MgII index. The annal average of solar power in 2008 was 33 GW lower than that in 1996. The decrease of the globally integrated geomagnetic energy from 1996 to 2008 was close to 29 GW including 13 GW for Joule heating from Weimer (2005b) and 16 GW for particle precipitation from NOAA Polar-Orbiting Environmental Satellites (POES) measurements. Although the estimate of the solar EUV power and geomagnetic energy vary from model to model, the reduction of the geomagnetic energy was comparable to the solar EUV power. The Thermosphere Ionosphere Electrodynamic General Circulation Model (TIEGCM) simulations indicate that the solar irradiance and geomagnetic energy variations account for 3/4 and 1/4 of the total neutral density decrease in 2008, respectively.en
dc.description.sponsorshipNSF ATM0955629en
dc.description.sponsorshipNSFC 40931056en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationDeng, Y., Y. Huang, S. Solomon, L. Qian, D. Knipp, D. R. Weimer, and J.-S. Wang (2012), Anomalously low geomagnetic energy inputs during 2008 solar minimum, J. Geophys. Res., 117, A09307, doi:10.1029/2012JA018039.en
dc.identifier.doihttps://doi.org/10.1029/2012ja018039en
dc.identifier.issn2169-9380en
dc.identifier.urihttp://hdl.handle.net/10919/25312en
dc.identifier.urlhttp://onlinelibrary.wiley.com/doi/10.1029/2012JA018039/pdfen
dc.language.isoenen
dc.publisherAmerican Geophysical Unionen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectGeneral-circulation modelen
dc.subjectIonospheric electrodynamic modelsen
dc.subjectAuroral modelen
dc.subjectFluxen
dc.subjectThermosphereen
dc.subjectSatelliteen
dc.subjectEventen
dc.titleAnomalously low geomagnetic energy inputs during 2008 solar minimumen
dc.title.serialJournal of Geophysical Research-Space Physicsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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