Phase relation between Pi2-associated ionospheric Doppler velocity and magnetic pulsations observed at a midlatitude MAGDAS station

Details Phase relation between Pi2-associated ionospheric Doppler velocity and magnetic pulsations observed at a midlatitude MAGDAS station Phase relation between Pi2-associated ionospheric Doppler velocity and magnetic pulsations observed at a midlatitude MAGDAS station

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11502215i&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A2, CiteID A02215

Physics

3

Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Ionosphere: Electric Fields (2712), Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836), Magnetospheric Physics: Electric Fields (2411)

Scientific paper

We examined the correlation between nighttime Pi2 pulsations detected simultaneously by a frequency modulated continuous wave (FM-CW) (HF) radar and by a ground magnetometer, both located at a midlatitude (L = 2.05) Magnetic Data Acquisition System station. Eighty-three Pi2 events were observed during the 43 day period from 23 September 2006 to 4 November 2006. The variations of the ground magnetic H component and ionospheric Doppler velocity (V*) exhibited high coherence for 80% of the 83 Pi2 events, for about a half of which the H and V* variations have the same dominant frequency. For such events, V* led H by 90° in phase, in the midnight sector of 2230-0300 LT. The average Ey (east-west electric field) amplitude derived from V* is 0.27 mV/m. The 90° phase delay was not found for the five events that were observed near dusk and dawn. The phase relation of H and V* for Pi2s in the midnight sector may be explained in terms of the radial standing structure of compressional waves, i.e., cavity mode oscillation.

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