Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa34a..07s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA34A-07
Physics
[0310] Atmospheric Composition And Structure / Airglow And Aurora, [3369] Atmospheric Processes / Thermospheric Dynamics
Scientific paper
The WIND Imaging Interferometer (WINDII) on NASA's Upper Atmosphere Research Satellite (UARS) made observations of the atmosphere from about 80 to 300 km from 1992 to 2003. Winds were measured from Doppler shifts of airglow emissions using a Doppler Michelson Interferometer; several emissions were viewed in order to cover the desired altitude range but the most successful was the atomic oxygen O(1S) green line emission at 557.7 nm. Most of the studies conducted concentrated on the upper mesosphere and lower thermosphere, consistent with the goals of UARS, so that the thermospheric observations were more limited and received much less attention. Current interest in the non-migrating DE3 (diurnal eastward propagating wave 3), originating in deep convection in the tropical regions and its propagation in the ionosphere and thermosphere led to an examination of the WINDII O(1S) dayglow emission at 250 km. From a satellite quasi-fixed in local time the wave 3 appears as a wave 4 and it turns out that this wave is routinely observed in the O(1S) emission at 250 km at the equator. At this altitude the dominant excitation process is photoelectron impact on atomic oxygen, so that what is being observed are atomic oxygen density perturbations of the neutral atmosphere. Prior observations of the wave 4 have been primarily of electron density perturbations of the ionosphere, by the CHAMP and GRACE satellites at 400 km and also in the integrated total electron content observed with the FORMOSAT-3/COSMIC satellites, so the neutral density observations provide new information. At mid-latitudes the O(1S) wave 4 disappears, as is the case for the earlier observations mentioned above, but in the WINDII data it re-appears again above 60 degrees latitude. This is a new and unexpected finding and an understanding of the origin of the high latitude wave 4 will further advance our understanding of the ITM system. The propagation characteristics for the wave 4 observations are presented and discussed.
Cho Yasuo
Shepherd Gordon G.
No associations
LandOfFree
WINDII Observations of the Thermospheric Wave 4 at Low and High Latitudes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with WINDII Observations of the Thermospheric Wave 4 at Low and High Latitudes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and WINDII Observations of the Thermospheric Wave 4 at Low and High Latitudes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-874495