A comparative study of geomagnetic pi2 pulsations observed by CHAMP and on the ground

Abstract

We present initial results of a comparative study of Pi2 pulsations observed by the CHAMP satellite and at the Sutherland ground station [32° 24′ S, 20° 40′ E]. Times when a Pi2 pulsation was observed on the ground (predominantly during night-time) and when CHAMP was located within 30° of longitude of Sutherland and at latitudes less than 50° N and S were selected for study. Following pre-processing and inspection to exclude unsuitable events, the satellite vector magnetic field data were rotated into a field aligned coordinate system and band-pass filtered in the Pi2 frequency band (typically.005 -.05 Hz). © 2005 Springer-Verlag Berlin Heidelberg.