Statistical Study of Fundamental Standing Alfven Waves Observed by the Polar Satellite near the Subsolar Magnetic Meridian

Details Statistical Study of Fundamental Standing Alfven Waves Observed by the Polar Satellite near the Subsolar Magnetic Meridian Statistical Study of Fundamental Standing Alfven Waves Observed by the Polar Satellite near the Subsolar Magnetic Meridian

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm41b0818k&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM41B-0818

Physics

2700 Magnetospheric Physics, 2731 Magnetosphere: Outer, 2740 Magnetospheric Configuration And Dynamics, 2752 Mhd Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

In March and April 2001, the apogee (9 Re) of the Polar satellite was located near the subsolar magnetopause with its orbital plane nearly parallel to a magnetic meridian plane. Polar electric and magnetic field data acquired during the two-month interval have been used to study fundamental standing Alfven waves near the subsolar meridian plane (magnetic local time = 1000-1400) at magnetic latitudes from the equator to 45 degrees and at L values between 7 and 12. In the frequency band from 1.5 to 10 mHz, fundamental mode oscillations were identified based on high coherence ( > 0.7) and an approximately 90-degree phase shift between the azimuthal magnetic and radial electric field components. Latitudinal variation of the relative amplitude of E and B field and L dependence of the fundamental frequencies are studied and compared with model calculations. We also compare the plasma densities estimated from the Alfven wave frequency and from Polar spacecraft potential.

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