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High-Altitude Polar Cap Electric Field Responses To Southward Turnings Of The Interplanetary Magnetic Field, Niescja E. Turner, D N. Baker, T I. Pulkkinen, H J. Singer, F Mozer, R P. Lepping
High-Altitude Polar Cap Electric Field Responses To Southward Turnings Of The Interplanetary Magnetic Field, Niescja E. Turner, D N. Baker, T I. Pulkkinen, H J. Singer, F Mozer, R P. Lepping
Physics and Astronomy Faculty Research
Interplanetary electric field coupling with the magnetosphere has been analyzed predominantly using data from the Wind magnetometer and the Polar electric field instrument. The coupling was investigated using the Polar Electric Field Instrument (EFI) to measure the electric field in the northern polar cap immediately following sharp southward turnings of the IMF as observed by Wind. Southward turnings were chosen which exhibited a sudden change of the IMF north-south component from BZ > 0 to BZ < 0 (GSM coordinates) after an hour or more of relatively stable conditions, and for which Polar was in the northern polar cap. These BZ changes correspond to EY changes in the interplanetary electric field. For each of the 30 identified events, a time was estimated …
Magnetospheric Response Times Following Southward Imf Turnings, Niescja E. Turner, D N. Baker, T I. Pulkkinen, H J. Singer, F Mozer
Magnetospheric Response Times Following Southward Imf Turnings, Niescja E. Turner, D N. Baker, T I. Pulkkinen, H J. Singer, F Mozer
Physics and Astronomy Faculty Research
We analyze the response times of various regions of the magnetosphere-ionosphere system to sudden southward turnings of the IMF. Our data set consists of 26 events during which the IMP BZ component was observed by WIND to change from a stea northward field to a southward field, which subsequently led to a substorm. The magnetospheric response to such IMF southward turnings is examined using data from the POLAR EFI experiment, the GOES 9 magnetometer, and ground magnetometers. The POLAR/EFI was used to investigate changes in the polar cap electric field which occurred in response to the changing interplanetary electric …