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| Titel |
Controlling of merging electric field and IMF magnitude on storm-time changes in thermospheric mass density |
| VerfasserIn |
Y. L. Zhou, S. Y. Ma, R. S. Liu, H. Luehr, E. Doornbos |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 31, no. 1 ; Nr. 31, no. 1 (2013-01-04), S.15-30 |
| Datensatznummer |
250017314
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| Publikation (Nr.) |
 copernicus.org/angeo-31-15-2013.pdf |
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| Zusammenfassung |
| The controls of merging electrical field, Em, and IMF (interplanetary magnetic field)
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.
It reveals the following: (1) The correlation coefficients between the air
mass density changes and the parameters of Em and B are generally larger at lower
latitudes than at higher latitudes, and larger in noon and
midnight sectors than in dawn and dusk. (2) The most likely delay time
(MLDT) of mass density changes in respect to Em is about 1.5 h (4.5 h) at high
(low) latitudes, having no distinct local time dependence, while it is 6 h at
middle latitudes in all the local time sectors except for noon, which is
longer than at low latitudes. A similar fact of longer delay time at mid-latitude
is also seen for B. The MLDTs for B at various latitudes are all
local time dependent distinctly with shorter delay time in noon/midnight
sector and larger in dawn/dusk. Despite of widely spread of the delay time,
IMF B exhibits still larger correlation coefficients with mass density
changes among the interplanetary parameters. (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 behavior for different types of storms. The influence
intensity of Em is much stronger for CIR-driven than for CME-driven storm,
while it is not so distinct for B. On the local time asymmetry of the
influence, both Em and B have largest influence at noon sector for CME-driven
storms, while an obviously larger intensification of the influence is found
in dawn/dusk sector during CIR storms, especially for parameter Em. |
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