Sudden impulses at low-latitude stations: Steady state response for northward interplanetary magnetic field

Details Sudden impulses at low-latitude stations: Steady state response for northward interplanetary magnetic field Sudden impulses at low-latitude stations: Steady state response for northward interplanetary magnetic field

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99..253r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A1, p. 253-261

Physics

55

Dynamic Pressure, Geomagnetic Pulsations, Interplanetary Magnetic Fields, Shock Waves, Solar Terrestrial Interactions, Solar Wind, Atmospheric Models, Diurnal Variations, Geomagnetic Latitude, Geomagnetism

Scientific paper

An examination of the response of the low-latitude H component of the Earth's magnetic field during the passage of interplanetary shocks when the interplanetary magnetic field is northward reveals that this response can be understood quantitatively in terms of the compression of a simple vacuum magnetospheric model. The compression at the surface of the Earth at 20 deg latitude at noon in the absence of equatorial electrojet effects is found to be 18.4 nT/(nPa)(exp 1/2). Stations below 15 deg latitude and above 40 deg appear to have additional but variable sources of current which magnify this effect. The diurnal variation of the compression is larger than expected from the simple vacuum magnetosphere, +/- 20% about the mean instead of +/- 10%. We interpret this difference to indicate that tail currents, not in the vacuum model, are as important as the magnetopause currents in determining the diurnal variation of the field at the surface of the Earth.

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