Ionospheric Response to Flickering Aurora

Details Ionospheric Response to Flickering Aurora Ionospheric Response to Flickering Aurora

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa13a1073g&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA13A-1073

Physics

0310 Airglow And Aurora, 0358 Thermosphere: Energy Deposition (3369), 0394 Instruments And Techniques

Scientific paper

Flickering aurora is characterized by optical emissions varying in intensity with frequencies typically between 5 and 20 Hz. Here we use high-speed narrow field-of-view imaging in white light to determine the intensity variation in the field aligned direction, which is also the direction of the beam of the EISCAT Svalbard Radar (ESR). Incoherent scatter radar data is noise-like, and must be integrated over multiple pulses to reduce the variance to useful levels, even for high signal to noise ratios. Usually, this means integrating over several seconds to some tens of seconds of observation, which is not very useful with respect to flickering aurora. In the experiment presented here, we have taken data at the voltage level, before any integration. By integrating pulses with the same relative phase with respect to the optical intensity we can determine the variation in radar back-scatter on time-scales of 0.02 s.

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