Ionospheric and field-aligned currents caused by the lower atmospheric disturbances

Details Ionospheric and field-aligned currents caused by the lower atmospheric disturbances Ionospheric and field-aligned currents caused by the lower atmospheric disturbances

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa23a1785i&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA23A-1785

Physics

[2409] Ionosphere / Current Systems, [2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [3384] Atmospheric Processes / Acoustic-Gravity Waves

Scientific paper

Clear magnetic pulsations with period around 4 minutes have been observed on the ground just after the earthquakes such as 2004 Great Sumatra Earthquake or strong volcanic eruptions such as 1991 Mt. Pinatubo eruption. These pulsations are supposed to be generated through the ionospheric dynamo caused by the vertical acoustic resonance between the ground and the ionosphere. Although the amplitude is small, similar phenomenon is generally observed when the lower atmosphere is disturbed by, for example, typhoons, inland earthquakes, etc. Recent observation suggests that they cause not only the ionospheric currents but also the field-aligned currents. We summarize these results of geomagnetic, barometric, and satellite observations and discuss the mechanism.

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