Extension of a polar ionospheric current to the nightside equator

Details Extension of a polar ionospheric current to the nightside equator Extension of a polar ionospheric current to the nightside equator

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33...11a&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 33, Jan. 1985, p. 11-16.

Other

18

Geomagnetism, Ionospheric Currents, Magnetic Disturbances, Night Sky, Sudden Storm Commencements, Equatorial Atmosphere, Polar Regions

Scientific paper

A detailed analysis of rapid-run magnetograms from Guam (geomagnetic latitude = 4.2 deg) revealed that there are two kinds of geomagnetic sudden commencement (SC) observed in nighttime. One is the ordinary SC consisting of a main impulse only which has a smooth rise of the H-component. The other is a superposition by a small positive impulse on the very beginning part of the smooth rise of the main impulse and consequently the SC starts with a small stepwise increase of the H-component. The latter type of SC occurs between 20 and 08 h L.T. and its occurrence rate takes the maximum value of about a 50 percent around 03 h L.T. Corresponding magnetograms from a dayside equatorial station (Huancayo, geomagnetic latitude = -0.7 deg) were examined and a good correlation was found between the stepwise SC at the nightside (Guam) and SC with a preliminary reverse impulse (PRI) at the dayside (Huancayo). Since PRI observed at the dayside equator may be interpreted as an extension of an ionospheric current due to a dusk-to-dawn electric field impressed on the polar ionosphere, the results show that a polar originating ionospheric current can extend to the nightside equator and produce a small but observable magnetic effect in spite of much reduced nighttime ionospheric conductivity.

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