Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm33b..04o&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM33B-04
Physics
2708 Current Systems (2409), 2720 Energetic Particles, Trapped, 2722 Forecasting, 2778 Ring Current, 2788 Storms And Substorms
Scientific paper
The development of magnetospheric storms has been conventionally addressed in terms of the Sym-H(Dst) index, which is ideally regarded as a measure of the ring current intensity. However, it is highly likely that a considerable fraction (~25%) of storm-time Sym-H reduction can be actually attributed to the tail current. Furthermore, the results of previous studies strongly suggest that the substorm-associated variations of the tail current and the ring current have opposite effects on Sym-H, and that the former overcompensates the latter. Thus, for the substorm timescale, using the Sym-H index as a measure of the ring current intensity is misleading with regard not only to the intensity of the ring current but also to the timing of the ring current development and decay. In the present study we address this issue by decomposing storm-time variations of Sym-H into low-frequency and high-frequency components. It is inferred that the low-frequency component is driven mostly by magnetospheric convection, whereas the high-frequency component includes most of substorm-related variations. Using the total energetic neutral atom (ENA) flux measured by the IMAGE/HENA instrument as a proxy of the ring current intensity, we quantitatively address how this high-frequency component is related to the variation of the ring-current intensity.
C:son Brandt Pontus
Mitchell Donald G.
Ohtani Shin
Ukhorskiy Aleksandr Y.
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