High Latitude Observations of the Mesosphere and Lower Thermosphere Associated with a Sudden Stratospheric Warming

Details High Latitude Observations of the Mesosphere and Lower Thermosphere Associated with a Sudden Stratospheric Warming High Latitude Observations of the Mesosphere and Lower Thermosphere Associated with a Sudden Stratospheric Warming

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa74a..06n&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA74A-06

Physics

2407 Auroral Ionosphere (2704), 2427 Ionosphere/Atmosphere Interactions (0335), 2467 Plasma Temperature And Density, 2494 Instruments And Techniques

Scientific paper

We present observations with the Poker Flat Incoherent Scatter Radar (PFISR) located in central Alaska during the time period leading up to, concurrent with, and after a Sudden Stratospheric Warming in January and February 2008. Temperature fluctuations were observed that seem to be correlated with stratospheric motions and temperature changes. Temperature fluctuations at altitudes of 90-100 km seem to be out-of phase with the stratospheric warmings, with the cooling slightly preceding the warming. This result implies that the cooling is a result of upward mean motion forced from below, which is consistent with ion-velocity measurements (used as a tracer of the neutral gas at these altitudes). Examination of zonal and meridional winds also suggest enhanced lower thermospheric mean zonal winds during the main stratospheric warming period as well as a strong meridional semi-diurnal tide during the main stratospheric cooling period. These results suggest strong coupling of the lower thermosphere to stratospheric motions.

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