Nighttime medium-scale travelling ionospheric disturbances observed by 630-nm airglow imagers near the auroral zone

Details Nighttime medium-scale travelling ionospheric disturbances observed by 630-nm airglow imagers near the auroral zone Nighttime medium-scale travelling ionospheric disturbances observed by 630-nm airglow imagers near the auroral zone

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa21a1861s&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA21A-1861

Physics

[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2435] Ionosphere / Ionospheric Disturbances, [2439] Ionosphere / Ionospheric Irregularities

Scientific paper

This is the first study of high-latitude medium-scale travelling ionospheric disturbances (MSTIDs) by using all-sky airglow imagers in the European and Canadian longitudinal sectors. Using two 630-nm airglow imagers, we observe nighttime MSTIDs at Tromsoe (69.6N, 19.2E; magnetic latitude: 67.1N), Norway and at Athabasca (54.7N, 246.7E; magnetic latitude: 61.7N), Canada. We also combine these imaging observations with thermospheric wind data obtained by a colocated Fabry-Perot interferometer at Tromsoe. For Tromsoe we analyzed airglow images for two winters from 9 January to 2 March 2009 and from 9 October 2009 to 3 March 2010. For Athabasca, we analyzed 2-year data from September 2005 to August 2007. At both stations, the MSTIDs were observed before the midnight with the occurrence rate of more than ~30 %. The average wavelengths, phase velocities, and periods of the observed MSTIDs were 100-400 km, 50-150m/s, and 30-60 min, respectively. We found that MSTIDs at Tromsoe tend to show eastward motion in addition to the typical southwestward motion. At Athabasca, we recognized a tendency that southwestward-moving MSTIDs occur frequently in winter. In summer, however we found characteristic northward-moving MSTIDs at Athabasca. At both stations, some MSTIDs showed characteristic change of their directions of propagation and wave front in association with auroral activity. We report an example of sudden motion of MSTIDs at substorm onset observed at 1730 UT on December 8, 2009 at Tromsoe. On the basis of these results, we discuss possible cause of generation and motion of nighttime MSTIDs at high latitudes.

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