Study of auroral-zone MSTIDs using 630nm airglow images at Tromsoe, Norway and Athabasca, Canada

Details Study of auroral-zone MSTIDs using 630nm airglow images at Tromsoe, Norway and Athabasca, Canada Study of auroral-zone MSTIDs using 630nm airglow images at Tromsoe, Norway and Athabasca, Canada

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31a1701m&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA31A-1701

Physics

[2435] Ionosphere / Ionospheric Disturbances

Scientific paper

There have been many observations of nighttime Medium-Scale Traveling Ionospheric Disturbances (MSTIDs) using all-sky airglow imagers at middle latitudes. However few airglow-imaging observations have been made at high latitudes. In this study we analyzed the MSTIDs observed at Tromsoe (69.6N, 19.2E; magnetic latitude: 67.1N) in Norway and at Athabasca (54.7N, 246.7E; magnetic latitude: 61.7N) in Canada using all-sky cooled-CCD imagers. The imagers observe 630-nm airglow which has an emission layer at altitudes of 200-300 km. This is the first study of high-latitude MSTIDs in the longitude sector of Europe and Canada using airglow images. According to the previous studies, nighttime MSTIDs at middle latitudes usually propagate southwestward. In this study, 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. We found that MSTIDs at Tromsoe tend to show eastward motion in addition to the typical southwestward motion. For Athabasca, we have analyzed 1-year data from September 2005 to August 2006 and recognized a tendency that southwestward-moving MSTIDs occur frequently in winter. The southwestward-moving is consistent with MSTIDs at middle latitudes. In summer, however we found characteristic northward-moving MSTIDs. At both observation points, some MSTIDs change their propagating directions and wave front in association with auroral activity. In the presentation, we report these results and discuss possible causes of high-latitude MSTIDs.

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