Altitude Variation of Average Daytime Disturbance Winds in the Middle and Lower Thermosphere Measured by WINDII

Details Altitude Variation of Average Daytime Disturbance Winds in the Middle and Lower Thermosphere Measured by WINDII Altitude Variation of Average Daytime Disturbance Winds in the Middle and Lower Thermosphere Measured by WINDII

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa12b0684e&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA12B-0684

Physics

2427 Ionosphere/Atmosphere Interactions (0335), 3369 Thermospheric Dynamics (0358)

Scientific paper

We use extensive wind measurements from the Wind Imaging Interferometer on board UARS to study average changes in global wind circulation in the daytime middle and lower thermosphere during geomagnetic storms. We will examine the storm-time evolution of disturbance winds as a function of height above 90 km at middle and low latitudes (0° -60° ). We will also examine how the winds respond to increasing levels of geomagnetic activity. Our preliminary results show that within 24 h after the onset of enhanced geomagnetic activity, significant wind perturbations develop at heights above 110 km. These disturbance winds are generally height-independent above 150 km but can change strongly with storm time. They decrease sharply below 120-150 km, and become insignificant below about 110-120 km. Our meridional disturbance wind patterns show equatorward wind perturbations that are strongest in the 06-09 LT sector, increase with latitude, and decrease with local time. For typical storms, the equatorward disturbances reach amplitudes on the order of 50 m/s at mid-latitudes. Westward disturbance winds develop at low and mid latitudes in the 06-09 LT sector, also within 24 h after storm onset. These perturbations are largest in the 120-140 km height range, with values on the order of 50 m/s. At upper mid latitudes (above 50° ), strong eastward perturbations are observed in the morning sector; these turn westward after 09 LT and extend to lower latitudes with increasing local time. These features increase sharply with latitude, reaching westward values in excess of 100 m/s for typical storms.

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