Polar mesosphere winter echoes
نویسنده
چکیده
The thermal and dynamical state of the atmosphere during polar mesosphere winter echoes F.-J. Lübken, B. Strelnikov, M. Rapp, W. Singer, R. Latteck, A. Brattli, U.-P. Hoppe, and M. Friedrich Leibniz Institute of Atmospheric Physics, Kühlungsborn, Germany Norwegian Defence Research Establishment (FFI), Kjeller, Norway Institute of Communications Networks and Satellite Communications, Graz University of Technology, Austria Received: 13 July 2005 – Accepted: 8 August 2005 – Published: 29 August 2005 Correspondence to: F.-J. Lübken ([email protected]) © 2005 Author(s). This work is licensed under a Creative Commons License.
منابع مشابه
Polar Mesosphere Winter Echoes during Solar Proton Events
Thin layers of enhanced radar echoes in the winter mesosphere have been observed by the ESRAD 52 MHz MST radar (67° 53 ‘ N, 21 ° 06 ‘ E) during several recent solar proton events. These polar mesosphere winter echoes (PMWE) can occur at any time of day or night above 70 km altitude, whereas below this height they are seen only during daytime. An energy deposition / ion-chemical model is used to...
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On 30 October 2004 during a strong solar proton event, layers of enhanced backscatter from altitudes between 55 and 75 km have been observed by both ESRAD (52 MHz) and the EISCAT VHF (224 MHz) radars. These echoes have earlier been termed Polar Mesosphere Winter Echoes, PMWE. After considering the morphology of the layers and their relation to observed atmospheric waves, we conclude that the ra...
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The remarkably strong radar echoes from the summer polar mesosphere have been an enigma to atmospheric and radar scientists since their discovery more than a decade ago. Since then, more sophisticated radar experiments and in situ rocket measurements have shed some light on the underlying physics and chemistry, and theories have been formulated to explain the generation of the intense radar bac...
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Polar mesosphere winter echoes (PMWE) were detected by two radars, ESRAD at 52 MHz located near Kiruna, Sweden, and EISCAT at 224 MHz located near Tromsø, Norway, during the strong solar proton event on 11–12 November 2004. PMWE maximum volume reflectivity was estimated to be 3× 10−15 m−1 for ESRAD and 2×10−18 m−1 for EISCAT. It was found that the shape of the echo power spectrum is close to Ga...
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