caa a22 4500 445346841 CHVBK 20180317142831.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s11207-010-9563-y doi (NATIONALLICENCE)springer-10.1007/s11207-010-9563-y Impact of CIR Storms on Thermosphere Density Variability during the Solar Minimum of 2008 [Elektronische Daten] [Jiuhou Lei, Jeffrey Thayer, Wenbin Wang, Robert McPherron] The solar minimum of 2008 was exceptionally quiet, with sunspot numbers at their lowest in 75 years. During this unique solar-minimum epoch, however, solar-wind high-speed streams emanating from near-equatorial coronal holes occurred frequently and were the primary contributor to the recurrent geomagnetic activity at Earth. These conditions enabled the isolation of forcing by geomagnetic activity on the preconditioned solar minimum state of the upper atmosphere caused by Corotating Interaction Regions (CIRs). Thermosphere density observations around 400km from the CHAMP satellite are used to study the thermosphere density response to solar-wind high-speed streams/CIRs. Superposed epoch results show that the thermosphere density responds to high-speed streams globally, and the density at 400 km changes by 75% on average. The relative changes of neutral density are comparable at different latitudes, although its variability is largest at high latitudes. In addition, the response of thermosphere density to high-speed streams is larger at night than in daytime, indicating the preconditioning effect of the thermosphere response to storms. Finally, the thermosphere density variations at the periods of 9 and 13.5days associated with CIRs are linked to the spatial distribution of low - middle latitude coronal holes on the basis of the EUVI observations from STEREO. Springer Science+Business Media B.V., 2010 Thermosphere density nationallicence CIR nationallicence Coronal holes nationallicence Solar minimum nationallicence Lei Jiuhou Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA aut Thayer Jeffrey Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA aut Wang Wenbin High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA aut McPherron Robert Institute Geophysics and Planetary Physics, University of California Los Angeles, Los Angeles, CA, USA aut Solar Physics Springer Netherlands 274/1-2(2011-12-01), 427-437 0038-0938 274:1-2<427 2011 274 11207 https://doi.org/10.1007/s11207-010-9563-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-010-9563-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lei Jiuhou Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA aut NATIONALLICENCE 700 1- Thayer Jeffrey Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA aut NATIONALLICENCE 700 1- Wang Wenbin High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA aut NATIONALLICENCE 700 1- McPherron Robert Institute Geophysics and Planetary Physics, University of California Los Angeles, Los Angeles, CA, USA aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 274/1-2(2011-12-01), 427-437 0038-0938 274:1-2<427 2011 274 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer