Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume 111, Issue A12, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2006JA011948
Keywords
-
Categories
Funding
- Directorate For Geosciences
- Division Of Earth Sciences [0836152] Funding Source: National Science Foundation
- NERC [bas010022] Funding Source: UKRI
- Natural Environment Research Council [bas010022] Funding Source: researchfish
Ask authors/readers for more resources
We analyze ground-based Fabry-Perot interferometer observations of upper thermospheric (similar to 250 km) horizontal neutral winds derived from Doppler shifts in the 630.0 nm ( red line) nightglow. The winds were measured over the following locations: South Pole (90 degrees S), Halley (76 degrees S, 27 degrees W), Arequipa (17S, 72 degrees W), Arecibo (18 degrees N, 67 degrees W), Millstone Hill (43 degrees N, 72 degrees W), Sondre Stromfjord (67 degrees N, 51 degrees W), and Thule (77 degrees N, 68 degrees W). We derive climatological quiet time (Kp < 3) wind patterns as a function of local time, solar cycle, day of year, and the interplanetary magnetic field ( IMF), and provide parameterized representations of these patterns. At the high-latitude stations, and at Arequipa near the geomagnetic equator, wind speeds tend to increase with increasing solar extreme ultraviolet (EUV) irradiance. Over Millstone Hill and Arecibo, solar EUV has a negative effect on wind magnitudes. As represented by the 10.7 cm radio flux proxy, the solar EUV dependence of the winds at all latitudes is characterized by a saturation or weakening of the effect above moderate values (F-10.7 > 150). The seasonal dependence of the winds is generally annual, but there are isolated cases in which a semiannual variation is observed. Within the austral winter, winds measured from the South Pole show a substantial intraseasonal variation only along longitudes directed toward the magnetic pole. IMF effects are described in a companion paper.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available