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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 16, issue 5
Ann. Geophys., 16, 542–548, 1998
https://doi.org/10.1007/s00585-998-0542-7
© European Geosciences Union 1998
Ann. Geophys., 16, 542–548, 1998
https://doi.org/10.1007/s00585-998-0542-7
© European Geosciences Union 1998

  31 May 1998

31 May 1998

An initial response of magnetic fields at geosynchronous orbit to Pi 2 onset as observed from the dip-equator

O. Saka1, H. Akaki2, O. Watanabe2, M. Shinohara2, and D. N. Baker3 O. Saka et al.
  • 1Department of Physics, Kurume National College of Technology, 1232-Komorino, Kurume 830, Japan Fax: +81 942 35 9307
  • 2Department of Earth and Planetary Sciences, Kyushu University, Fukuoka, Japan
  • 3Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado, USA

Abstract. Fluxgate magnetometer data recorded at the dip-equator (Huancayo, Peru; 1.44°N, 355.9° in geomagnetic coordinates; 12.1°S, 75.2°W in geographic coordinates; L = 1.00) with higher accuracy of timing (0.1 s) and amplitude resolution (0.01 nT) were utilized to survey an onset of Pi 2 pulsations in the midnight sector (2100–0100 LT) during PROMIS (Polar Region and Outer Magnetosphere International Study) periods (1 March–20 June, 1986). It is found that changing field line magnitude and vector as observed by magnetometer on board the synchronous satellites in the midnight sector often takes place simultaneously with the onset of Pi 2 pulsations at the dip-equator. The field disturbances that follow thereafter tend to last for some time both at the geosynchronous altitudes and the dip-equator. In this report, we examine the initial response of the field lines in space, and attempt to classify how the field line vector changed in the meridional plane.

Key words. Magnetospheric physics · Magnetospheric configuration and dynamics · MHD waves and instabilities · Plasmasphere

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