Solar Wind Alfvén Waves: A Source of Pulsed Ionospheric Convection and Atmospheric Gravity Waves

Details Solar Wind Alfvén Waves: A Source of Pulsed Ionospheric Convection and Atmospheric Gravity Waves Solar Wind Alfvén Waves: A Source of Pulsed Ionospheric Convection and Atmospheric Gravity Waves

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsm31a..11p&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #SM31A-11

Physics

2149 Mhd Waves And Turbulence, 2427 Ionosphere/Atmosphere Interactions (0335), 2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 3384 Waves And Tides

Scientific paper

SuperDARN radar ground scatter signatures of medium scale travelling ionospheric disturbances (TIDs) caused by atmospheric gravity waves with periods of 20-50 min can be traced to a high latitude source, namely Pulsed Ionospheric Flows (PIFs) due to bursts in the convection electric field. The significance of PIFs and TIDs in the context of solar-terrestrial interaction is that Alfvénic fluctuations of the interplanetary magnetic field observed in the solar wind plasma streaming from coronal holes correlate with PIFs and TIDs. PIFs are interpreted as ionospheric signatures of magnetic reconnection pulsed by solar wind Alfvén waves at the dayside magnetopause or attributed to pressure pulses resulting from the interaction between solar wind Alfvén waves and the bow shock. The interpretation of the observed TID signatures in the radar ground scatter is supported by ray tracing of gravity waves transmitted to the F region from a source in the E region after being reflected/refracted upward in the upper mesosphere. The observed one-to-one correspondence between the convection electric field bursts and TIDs is consistent with the modeling results by Millward (1994). The correlation with solar wind Alfvén waves points to very direct coupling of solar wind energy into the subauroral atmosphere. Millward G. H., Ann. Geophysicae, 12, 94-96, 1994.

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