An empirical relationship between interplanetary conditions and Dst

Details An empirical relationship between interplanetary conditions and Dst An empirical relationship between interplanetary conditions and Dst

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.4204b&link_type=abstract

Journal of Geophysical Research, vol. 80, Nov. 1, 1975, p. 4204-4214.

Physics

Geophysics

291

Interplanetary Magnetic Fields, Magnetic Storms, Magnetospheric Instability, Ring Currents, Solar Wind Velocity, Algorithms, Astronomical Models, Electric Fields, Geophysics, Sudden Storm Commencements

Scientific paper

An algorithm is presented for predicting the ground-based Dst index solely from a knowledge of the velocity and density of the solar wind and the north-south solar magnetospheric component of the interplanetary magnetic field. The three key elements of this model are an adjustment for solar wind dynamic pressure, an injection rate linearly proportional to the dawn-to-dusk component of the interplanetary electric field which is zero for electric fields below 0.5 mV per m, and an exponential decay rate of the ring current with an e folding time of 7.7 hours. The algorithm is used to predict the Dst signature of seven geomagnetic storm intervals in 1967 and 1968. In addition to being quite successful, considering the simplicity of the model, the algorithm pinpoints the causes of various types of storm behavior. This one algorithm accounts for magnetospheric behavior at quiet and disturbed times and seems capable of predicting the behavior of Dst during even the largest of storms.

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