Ground Observations of ULF Pulsations During Pulsating Aurora

Details Ground Observations of ULF Pulsations During Pulsating Aurora Ground Observations of ULF Pulsations During Pulsating Aurora

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33a1761k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM33A-1761

Computer Science

Sound

2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions (2431), 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

The ROPA (Rocket Observations of Pulsating Aurora) sounding rocket was launched northward from Poker Flat, crossing the poleward boundary of a region of pulsating aurora. In association with ground support (incoherent scatter radar, ULF search-coil magnetometer, fluxgate magnetometer, and all sky imager), pulsating auroral signatures have been observed on the ground and in space. During or before the periods of pulsating aurora, the observations of ULF waves revealed two signatures. A narrow band signal, which exhibits an abrupt onset and a rising tone from 0.1 to 0.3 Hz over the course of an hour or two, precedes the pulsating aurora in 4 of 5 events studied but is not observed in the 5th event. Following the narrow band signature, or possibly beginning while the narrow band signal is still observed, broad band waves (characterized by noisy spectral structure) are observed that are strongly modulated (in all of the events) with a period on the order of 10 15 minutes. In this presentation, we discuss the nature of these waves such as polarization (predominantly right handed). Some of the events show double band spectral signatures where the upper ones rise and lower ones fall with periodic spectral signatures (4 - 5 min) and harmonic structures. It is also discussed how they are generated and what role they might play in pulsating aurora.

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