Interaction of atmospheric gravity waves with equatorial electrojet plasma waves

Details Interaction of atmospheric gravity waves with equatorial electrojet plasma waves Interaction of atmospheric gravity waves with equatorial electrojet plasma waves

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa23a1884s&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA23A-1884

Physics

[2415] Ionosphere / Equatorial Ionosphere, [2439] Ionosphere / Ionospheric Irregularities, [2494] Ionosphere / Instruments And Techniques, [3384] Atmospheric Processes / Acoustic-Gravity Waves

Scientific paper

On 9 January 2002 and 14 November 2001, the Sao Luis, Brazil, 30 MHz coherent scatter radar has detected unique day-time E region echoes scattered from the equatorial electrojet plasma irregularities. The back-scatter radar echoes on these days exihibit temporal and spatial quasi-oscillations of the electrojet echoing layer. Two dimensional spectral analysis of the magnetic field perturbation (a measure of the strength of the equatorial electrojet) observed by a nearby magnetometer on these days have shown short period waves (20 to 60 minutes) which might correspond to atmospheric gravity waves. During these days GOES 8 satellite IR images have indicated tropospheric deep convection activities at horizontal distances between 200 and 500 km north-east of Sao Luis. The results of this study suggest the generation of gravity waves from tropospheric convection and the coupling of the convection to the E region ionosphere through the wind fields of gravity waves thereby modulating the background electric field and causing the quasi-oscillations observed in the radar and magnetic field perturbation data on 9 January 2002 and 14 November 2001.

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