Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm41a1999d&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM41A-1999
Physics
[2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [2790] Magnetospheric Physics / Substorms
Scientific paper
Substorm activity during intense (B > 10 nT), long duration (T > 3 hr) northward (Bz > 0 nT = N) IMF magnetic clouds (MCs) during solar cycle 23 (SC23) have been examined in detail. The MCs with northward-then-southward (NS) IMFs were analyzed separately from MCs with southward-then-northward (SN) configurations. It is found that there is a lack of substorms during the N field intervals of NS clouds. In sharp contrast, substorms do occur during the N field portions of SN MCs. From the above two results it is reasonable to conclude that the latter substorms represent residual energy remaining from the preceding S portions of the SN MCs. We use this scenario to derive a new solar wind-magnetosphere coupling function during northward IMFs: E_(NIMF) = α N^(-1/12) V^(7/3) B^(1/2)+β V |Dst_(min)|. The first term on the right-hand side of the equation represents the energy input via "viscous interaction", and the second term indicates the residual energy stored in the magnetotail. It was empirically found that the magnetosphere/magnetotail can store energy for ~ 4 hrs before it dissipates away. The concept of magnetosphere/magnetotail short term energy storage should prove to be useful to predict when interplanetary shocks will and will not trigger substorms.
Du Aijun
Sun WaiChing
Tsurutani Bruce
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