Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm13b1599h&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM13B-1599
Physics
[2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2760] Magnetospheric Physics / Plasma Convection, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [2790] Magnetospheric Physics / Substorms
Scientific paper
Auroral substorms are a frequently occurring disturbance in the Earth’s magnetosphere. Substorms play a key role in coupling the solar wind to the magnetosphere. At substorm onset there is a sudden enhancement of auroral intensity and the aurora moves poleward. Associated with the auroral expansion are magnetic disturbances called polar magnetic substorms. These disturbances provide information about the onset time of the auroral expansion and its strength. The time history and strength of these disturbances is quantified by the auroral electrojet index AL. In this study we use sharp decreases of this index to monitor the occurrence and strength of substorms. It has been suggested that the properties of substorms may be correlated with the solar cycle. However, recent studies are contradictory suggesting that there is, or there is not, a solar cycle effect in substorm occurrence. Currently there are only a few large statistical studies that have investigated this issue. Most of these either use local geomagnetic indices or space observations for substorm identification which restricts the scope of studies. In our work we apply a procedure utilizing the global AL index and Pi 2 pulsations from multiple stations to construct a substorm list for solar cycle #23 (1995 to 2008). Our preliminary list of substorms is complete and has more than 12,000 AL onset events. A more refined substorm list based on Pi 2 timing of the AL onsets is under development. The preliminary AL onset list enables us to examine several important phenomena such as the occurrence frequency of intense substorms, duration of substorm phases, tail lobe field strength and solar wind condition during different phases of the solar cycle. Several recent satellites (Cluster, Geotail and Themis) observations will be used in this study.
Angelopoulos Vassilis
Galland Kivelson Margaret
Ge Yufei
Hsu Ted
Kissinger J.
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