Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51b1786h&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM51B-1786
Physics
[2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [2788] Magnetospheric Physics / Magnetic Storms And Substorms
Scientific paper
The solar wind is the driver of dynamic activity in the terrestrial magnetosphere. Magnetic reconnection on the dayside transfers momentum and energy from the solar wind to the magnetotail. The magnetotail stores this energy until reconnection begins in the central plasma sheet. The release of the stored energy is accompanied by a return of the stretched magnetotail to a more dipolar configuration. The energy release is accomplished by substorms which play a key role in the circulation of the energy, mass, and magnetic flux. As the solar wind and interplanetary magnetic field evolve during the solar cycle we expect the frequency and strength of substorms to change. In order to identify as many substorms as possible this study utilizes the global AL index and Pi 2 pulsations from multiple stations to construct a substorm list for solar cycle #22 (1986 to 1996) to solar cycle #23 (1996 to 2008). Our preliminary list of substorms is complete for cycle # 23 and has more than 12,000 AL onset events. The identification of AL onsets for cycle # 22 is in progress. The preliminary AL onset list from cycle # 23 suggests that there are obvious solar cycle effects on substorm occurrence and strength. A detailed examination of how magnetospheric parameters such as the size of the magnetosphere and the strength of the tail lobe field strength change in response to the solar wind can give us important information how and why substorm characteristics change with the solar cycle. Satellite data (Cluster, Geotail and Themis, ISEE, IMP8) observations will be used for the solar wind and magnetotail monitors. Similar analysis will be carried out using the list of substorms during cycle #22.
Chu Xiaoyong
Hsu Ted
Kissinger J.
McPherron Robert L.
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