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Controlling of merging electric field and IMF magnitude on storm-time changes in thermospheric mass density
MA Shuying 1 * #,ZHOU Yunliang 1,LIU Ruosi 1,LUEHR H. 2,DOORNBOS E. 3
1.Dept. of Space Physics, College of Electronic Information, Wuhan University，Wuhan 430072
2.GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany
3.Delft Institute of Earth Observation and Space Systems, Delft University of Technology, Kluyverweg 1, 2629 HS Delft, The Netherlands
*Correspondence author
#Submitted by
Subject:
Funding: the Doctoral Fund of Ministry of Education of China （No.No. 200804860012）, the National Nature Science Foundation of China （No.No. 40804049）
Opened online:15 June 2012
Accepted by: none
Citation: MA Shuying,ZHOU Yunliang,LIU Ruosi.Controlling of merging electric field and IMF magnitude on storm-time changes in thermospheric mass density[OL]. [15 June 2012] http://en.paper.edu.cn/en_releasepaper/content/4481687
 
 
The controls of merging electrical field, Em, and IMF magnitude, B, on the storm-time changes in upper thermospheric mass density are statistically investigated using GRACE accelerometer observations and the OMNI data of solar wind and IMF for 35 great storms during 2002-2006 years. It reveals that: (1) The correlation coefficients between the air mass density changes and the parameters of Em and B are larger at lower latitudes than at higher latitudes generally, and larger in noon and midnight sectors than in dawn and dusk. (2) As a whole, the delay times of mass density changes behind Em and B range 1.5-9h and 1.5-12h respectively. The most likely delay time (MLDT) is about 4.5h for both parameters at low/middle latitudes when taking statistics for all local time sectors. The MLDT is in fact local time dependent with about 1.5h in noon sector and ranging from 6 to 7.5h for other sectors. (3) The linear control factor of B on the density changes increases for large B, in contrast to somewhat saturation trend for larger Em. (4) The influence of B and Em on the mass densities shows different behaviour for different type storm. In general, the influence is stronger for CIR-driven than for CME-deiven storm, which seems more remarkable for parameter Em. Moreover, for CME-driven storms, both Em and B has largest influence at noon sector and smallest at dawn sector; while for CIR-diven storms, Em and B has larger influence at dawn/dusk sectors and smaller at noon/midnight sectors.
Keywords: Space Physics; Thermospheric air mass density; Magnetic storm; SW-M-I-T coupling; Merging electrical field; IMF B
 
 
 

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