Observations of a large-scale thermospheric gravity wave using ISR, TEC, and airglow data and its effect on the mesosphere

Details Observations of a large-scale thermospheric gravity wave using ISR, TEC, and airglow data and its effect on the mesosphere Observations of a large-scale thermospheric gravity wave using ISR, TEC, and airglow data and its effect on the mesosphere

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsa11a..05n&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #SA11A-05

Physics

0310 Airglow And Aurora, 2427 Ionosphere/Atmosphere Interactions (0335), 2435 Ionospheric Disturbances, 2443 Midlatitude Ionosphere, 2487 Wave Propagation (6934)

Scientific paper

On October 1-2, 2002, a moderate geomagnetic storm took place with the 3-hour Kp index reaching 5- for 24 hours and 7+ twice. Evidence from ISR, TEC, airglow, and ionosonde data indicate that a series of large-scale thermospheric atmospheric gravity waves were launched from the auroral zone, modulating the mid-latitude ionosphere over Arecibo by over 150 km and driving mid-latitude and indirectly equatorial spread-F. A unique method is presented to ``image'' the TIDs using TEC perturbations, which can be interpreted as the effect of the F-layer modulation due to neutral wind perturbations on the plasma pressure (plasmaspheric flux). These TIDs, while inherently thermospheric, also effected the mesosphere. We show 630.0-nm and 557.7-nm airglow measurements from Hawaii and Arecibo that show a change in the emission levels of several hundred Rayleighs, most of which was due to the F-layer fluctuations. However, the TID also caused an enhancment in the mesospheric portion of the 557.7-nm emission. Via a modeling study of the two emissions using standard techniques, we find that an atomic oxygen fluctuation of about 15% is required to explain the observed intensities. These variations may be associated with changes in the eddy diffusion parameters associated with the gravity wave passage.

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