Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm52b..04s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM52B-04
Physics
[2704] Magnetospheric Physics / Auroral Phenomena, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2753] Magnetospheric Physics / Numerical Modeling, [2790] Magnetospheric Physics / Substorms
Scientific paper
We report on dynamics of discrete aurorla arcs and ULF electromagnetic waves, observed with ground optical and magnetic instruments during a substorm onset on 29 October 2008. These observations were performed as a part of the ionospheric heating experiment conducted at the High Frequency Active Auroral Research Program (HAARP) facility in Alaska. The experiment was aimed at disrupting/reconfiguring the current system associated with a quiet auroral arc during the substorm growth phase by the development of the ionospheric feedback instability (IFI) in the region of the downward current adjacent to the arc. These observations support the idea that geomagnetic substorms are closely connected with the IFI development and generation of intense ULF electromagnetic waves and density structures in the downward current region. They also show strong correlation between generation of ULF waves and spatiotemporal dynamics of discrete auroral arcs. However, the questions as to whether heating of the ionosphere with HAARP could affect the IFI development and whether IFI plays the role of a triggering mechanism for the breakup of the stable auroral arc and subsequent substorm onset or it is primarily a consequence remain unanswered.
Mishin Evgeni V.
Pedersen Todd. R.
Snyder Lee A.
Streltsov Anatoly V.
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