The largest imaginable magnetic storm

Details The largest imaginable magnetic storm The largest imaginable magnetic storm

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jastp..73.1444v&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 73, Issue 11, p. 1444-1446.

Physics

Scientific paper

The size of a magnetic storm is measured by the maximum depression of the horizontal magnetic field at the Earth's equator. The largest depression that could possibly occur can be estimated by noting that the geomagnetic field is inflated by plasma pressure in the magnetosphere that is enhanced above the effective pressure the of the surrounding medium (magnetosheath and magnetotail), and that this pressure enhancement results largely from adiabatic compression as plasma is transported inward into dipolar flux tubes of decreasing volume. A rough but reasonable upper limit can then be estimated by setting the effective plasma pressure equal to the magnetic pressure of the dipole field at the equator of each flux tube, and applying the Dessler-Parker-Sckopke theorem. The upper limit thus obtained for the (negative) value of the Dst index is -Dst˜2500nT; for comparison, the largest depression yet observed is estimated as -Dst˜1760nT.

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