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Engineering-Physics Space Plasma Seminar

David Kenward, UNH

Tuesday, October 15, 2019, 4:00–5:00pm

Wilder 202

Observations of Ion Upwelling and 630~nm Emission Surge During Pulsating Aurora

Data from filtered All Sky Imagers (557.7, 630.0 nm) located at Poker Flat are presented alongside four hours of Poker Flat Incoherent Scatter Radar (PFISR) data which shows ion upwelling signatures in the vicinity of pulsating aurora. Pulsating aurora observations are more often reported in 557.7 nm and 427.8 nm, as these emissions are more sensitive to high energy (10s of keV) electron precipitation. However, data are presented here which show an abrupt incrase in the 630.0 nm emission intensity along with pulsations. This emission is generated preferentially by soft (100s of eV scale) precipitation. The source of these soft electrons is unknown, but may be due to secondary electrons which scatter during a pulsating aurora event. We present all sky camera observations which suggest regions of enhanced soft electron precipitation which tracks the edge of the pulsating aurora in conjunction with enhanced ambipolar fields, a known factor contributing to ion upwelling.

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