Thermospheric signatures of sudden stratospheric warming

Details Thermospheric signatures of sudden stratospheric warming Thermospheric signatures of sudden stratospheric warming

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa23a..02g&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA23A-02

Physics

0358 Thermosphere: Energy Deposition (3369), 2427 Ionosphere/Atmosphere Interactions (0335), 2443 Midlatitude Ionosphere, 3334 Middle Atmosphere Dynamics (0341, 0342), 3369 Thermospheric Dynamics (0358)

Scientific paper

We present experimental evidence of a link between the lower atmosphere and mid-latitude thermosphere and ionosphere using observations of neutral winds and ion temperatures by Millstone Hill ISR (42.6N, 288.5E) during stratospheric warming of January 2008. Temperature data reveal alternating regions of cooling in the large altitude range (150-300 km above ground) and warming in a narrow altitude band (120- 140 km above ground). Both warming and cooling variations reach 70-80K (11-16% of the background temperature) and are pronounced mostly in the morning and afternoon hours. The temporal and altitudinal variation in the temperature anomaly suggests it might be related to semidiurnal modulation, and the amplitude of semidiurnal tide in wind data is increased around the time of maximum in stratospheric warming. We rule out seasonal trend, solar flux and geomagnetic activity as significant causes of such variation and suggest that it is associated with stratospheric warming. Alternating areas of warm and cold vertical zones in the atmosphere are a well established phenomena, with mesospheric cooling accompanying stratospheric warming. Our observations show for the first time that areas of warming and cooling extend to altitudes of upper thermosphere (up to 300 km) and suggest that processes responsible for generation of sudden stratospheric warmings may also impact the lower and upper thermosphere and ionosphere.

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