ULF waves and magnetic field characteristics in the polar cusp observed at Godhavn

Details ULF waves and magnetic field characteristics in the polar cusp observed at Godhavn ULF waves and magnetic field characteristics in the polar cusp observed at Godhavn

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993nipr.symp..103s&link_type=abstract

In National Inst. of Polar Research, Proceedings of the NIPR Symposium on Upper Atmosphere Physics, No. 6 p 103-116 (SEE N94-292

Physics

Atmospheric Radiation, Earth Ionosphere, Earth Magnetosphere, Geomagnetism, Magnetohydrodynamic Waves, Polar Cusps, Polar Regions, Solar Activity Effects, Solar Planetary Interactions, Ultrahigh Frequencies, Magnetic Disturbances, Magnetometers, Radio Emission, Solar Wind

Scientific paper

For the intrusion of the solar energy into the magnetosphere the polar cusp has been believed to be the most important region in the magnetosphere. By using magnetometer data obtained in November 1989 at Godhavn in Greenland located in the polar cusp, the dayside enhancement of Ultra Low Frequency (ULF) wave activity is studied in relation to both variations of the ground magnetic field and the interplanetary magnetic field. Godhavn is found to be one of the appropriate stations for studying magnetic field variations and ULF waves in the polar cusp, i.e., the normal-run magnetograms show negative H component excursion during the day time, sometimes sporadically and in the other time gradually. The ULF waves enhance their activity closely associated with these negative field variations. These field variations might be considered to occur when the station passes under the westward current flowing in the cusp ionosphere. By comparing the ground magnetic activities with the interplanetary magnetic field, the ground magnetic activities occur in association with high frequency fluctuations of the Interplanetary Magnetic Field (IMF). A comparison of spectral power of the ULF wave at Godhavn (cusp latitude) with those at Showa (auroral latitude) showed more enhanced magnetic power and more resonance-like oscillation of ULF waves at the auroral latitude.

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