Global ULF disturbances during a stormtime substorm on 25 September 1998

Details Global ULF disturbances during a stormtime substorm on 25 September 1998 Global ULF disturbances during a stormtime substorm on 25 September 1998

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1486m&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A12, pp. SMP 40-1, CiteID 1486, DOI 10.1029/2002JA009302

Physics

3

Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Ionosphere: Ionospheric Disturbances, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Auroral Phenomena (2407)

Scientific paper

Quasiperiodic perturbations of ionospheric plasma with ~10 min occurrence periods were observed by incoherent scatter radars (ISR) in high-latitude and midlatitude ionosphere after the onset of a stormtime substorm. The latter occurred during a period of complex dynamical activity and had a number of unusual characteristics. The perturbations indicate ultralow frequency (ULF) electric field enhancements over the Northern Hemisphere. Specifically, strong subauroral electric fields are associated with the ring current-related polarization jet (PJ). These perturbations correlate with magnetic variations in high-latitude and midlatitude regions spanning ~21 hours in magnetic local time (MLT). The radar and ground magnetometer data are supported by simultaneous observations from the DMSP and geostationary satellites. As a result of the onset, the preexisting PJ shifted equatorward to L ~ 2.5. Similar periodicities in the solar wind dynamic pressure and interplanetary magnetic field (IMF) appear to be natural sources of the ULF perturbations observed at high and middle latitudes.

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