Pi2-associated electric and magnetic filed variations

Akihiro Ikeda1, Kiyohumi Yumoto2, Manabu Shinohara1, Teiji Uozumi2, Kenro Nozaki3, Akimasa Yoshikawa4, Bychkov V.V.5, Shevtsov B.M.5
  1. Kagoshima National College of Technology, Kagoshima, Japan
  2. International Center for Space Weather Science and Education, Kyushu University, Fukuoka, Japan
  3. National Institute of Information and Communications Technology, Koganei, Tokyo, Japan
  4. Department of Earth and Planetary Sciences, Kyushu University, Fukuoka, Japan
  5. Institute of Cosmophysical Research and Radiowaves Propagation FEB RAS, Russia

   At the onset of magnetospheric substorms, Pi 2 pulsations occur globally
   in the magnetosphere with a period range from 40 to 150 seconds [e.g.
   Saito, 1968]. Pi 2 has been studied with arrays of magnetometers on the
   ground and with in-situ observation by satellites [e.g., Yumoto et al.,
   2001]. However characteristics of Pi 2 electric pulsations in the
   ionosphere have not been clearly clarified yet.

   In this study, we have focused on the relationship of the ionospheric
   Doppler velocity in the F-region detected by an FM-CW (Frequency Modulated
   Continuous Wave) radar, the magnetic Pi 2 pulsations observed by MAGDAS
   (the MAGnetic Data Acquisition System) [Yumoto and the MAGDAS Group, 2006
   and 2007], and at mid-latitude station PTK (Magnetic Latitude: 45.8
   degree, Magnetic Longitude: 221.6 degree, L=2.05).