A relationship between the auroral absorption and the magnetic activity in the polar cap

Details A relationship between the auroral absorption and the magnetic activity in the polar cap A relationship between the auroral absorption and the magnetic activity in the polar cap

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jastp..77...40f&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 77, p. 40-45.

Physics

Scientific paper

The auroral absorption is an absorption of the cosmic radio noise. It depends on the electron concentration in the ionospheric D layer, which is strongly affected by the precipitating flux of high-energy (E>30 keV) electrons. The data from Canadian chain of riometers were used to study the absorption as a function of magnetic local time (MLT) and geomagnetic latitude for different levels of geomagnetic activity, characterized by the Polar Cap (PC) index (Troshichev et al., 2006). The 1 min and hourly values of absorption were divided into two sets depending on the level of activity and examined as a function of MLT and geomagnetic latitude for quiet conditions (=0.56 mV/m) and a higher activity (=1.87 mV/m). It is shown that the auroral absorption reaches distinct maxima at latitudes of 66°-68° (equatorward zone) and 71°-72° (poleward zone), both of them being dependent on level of activity determined by the PC-index. The maximum correlation between the absorption and PC index is observed in the after-midnight MLT sector. The results show that the PC index is a good indicator of the solar wind energy entry into the magnetosphere and can be useful for monitoring the state of low ionosphere in the auroral zone.

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