Statistical comparison of the ionospheric energy deposition before and after sudden enhancements in solar wind dynamic pressure using AMIE output

Details Statistical comparison of the ionospheric energy deposition before and after sudden enhancements in solar wind dynamic pressure using AMIE output Statistical comparison of the ionospheric energy deposition before and after sudden enhancements in solar wind dynamic pressure using AMIE output

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm41a1997b&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM41A-1997

Physics

[2723] Magnetospheric Physics / Magnetic Reconnection, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2760] Magnetospheric Physics / Plasma Convection, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions

Scientific paper

The solar wind dynamic pressure, both through its steady state value and through its variations, plays an important role in the determination of the state of the terrestrial magnetosphere and ionosphere, its effects being only secondary to those of the Interplanetary Magnetic Field (IMF). The solar wind dynamic pressure value is routinely included in various magnetospheric and ionospheric models as input. Recent studies have demonstrated the significant effect solar wind dynamic pressure enhancements have on the aurora, the field-aligned currents, the size of the polar cap, and the ionospheric convection and the transpolar potential. We present statistical studies of the ionospheric energy deposition during steady solar wind pressure conditions, and before and after sudden enhancements in solar wind pressure. We use five years of output from the Assimilative Mapping of Ionospheric Electrodynamics (AMIE) technique. The AMIE output consists of 1-min resolution values of the transpolar potential, the Hemispheric Power (a measure of auroral precipitation strength), and the ionospheric Joule heating. We find that the ionospheric energy deposition has the expected dependence on solar wind pressure and the IMF during steady conditions, increasing with increasing pressure and southward magnitude of the IMF. However, after solar wind pressure fronts there is additional enhancement of all AMIE parameters, indicating increased energy deposition on the terrestrial ionosphere. The increased ionospheric input lasts for 1-2 hours and then slowly dissipates, even though the solar wind pressure remains high, suggesting that the increased response of the ionosphere is transient in nature.

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