High-resolution observations of naturally enhanced ion acoustic lines and accompanying auroral fine structures

Details High-resolution observations of naturally enhanced ion acoustic lines and accompanying auroral fine structures High-resolution observations of naturally enhanced ion acoustic lines and accompanying auroral fine structures

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11503310m&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A3, CiteID A03310

Other

1

Ionosphere: Auroral Ionosphere (2704), Ionosphere: Plasma Waves And Instabilities (2772), Ionosphere: Ionospheric Irregularities, Ionosphere: Particle Precipitation

Scientific paper

We present observations of naturally enhanced ion acoustic lines (NEIALs) from a ground-based campaign, combining high-resolution auroral imaging with raw voltage samples from the Poker Flat Incoherent Scatter Radar. We achieved maximum time resolution (˜12 ms) by employing a single beam position. Four distinct events were identified, constituting the first common-volume imager/NEIAL observations in this mode. All were associated with auroral fine structures, were short-lived, and occurred on the boundaries of dynamic, luminous features. Their presence provides further insight into in situ processes, such as enhanced wave activity, that are otherwise unobservable using ground-based instrumentation. Combined high-resolution optical and radar observations reveal the temporal development of NEIALs in relation to the dynamic auroral fine structures present. These observations indicate that NEIALs manifest with timescales of less than 50 to 100 ms, providing a specific constraint for the modeling of their generation mechanisms.

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