Diurnal polarization pattern of ULF geomagnetic pulsations in the Pc5 band from low to polar latitudes

Details Diurnal polarization pattern of ULF geomagnetic pulsations in the Pc5 band from low to polar latitudes Diurnal polarization pattern of ULF geomagnetic pulsations in the Pc5 band from low to polar latitudes

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jastp..65.1179l&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 65, Issue 11-13, p. 1179-1185.

Physics

2

Geomagnetic Pulsations, Mhd Waves And Instabilities, Wave Polarization, Solar Wind-Magnetosphere Interaction

Scientific paper

We conducted a statistical analysis of the ULF (~1-4mHz) geomagnetic field pulsations recorded at 30 geomagnetic observatories from low to very high latitudes during two consecutive years (1998-99), focusing our attention on the latitudinal dependence of the diurnal polarization pattern. At latitudes lower than ~65°, a reversal of the polarization sense from counterclockwise to clockwise appears in the local afternoon and this feature could be interpreted in terms of corotating solar wind discontinuities impacting the postnoon magnetopause; our results also show that the reversal is less clear at 55°-65°, suggesting the presence of a further wave source in the afternoon sector, especially during enhanced magnetospheric activity, possibly related to phenomena occurring in the outer plasmasphere. For latitudes between ~65° and 70°, the polarization sense reverses around local geomagnetic noon, indicating an antisunward propagation and suggesting the Kelvin-Helmholtz instability at the magnetopause as a possible wave source. Between ~70° and ~80°, the polarization pattern is characterized by four reversals during the day, as expected for the resonance region. During daytime hours, especially in the prenoon sector, the polarization pattern allows to clearly identify the latitude of the resonance line, which slightly increases with increasing time from morning toward noon; moreover, the location of the resonance line shifts to lower latitudes for increasing frequency.

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