Mesospheric turbulence during PMWE-conducive conditions
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Remote sensing of mesospheric dust layers using active modulation of PMWE by high-power radiowaves
This paper presents the first study of the modulation of polar mesospheric winter echoes (PMWE) by artificial radiowave heating using computational modeling and experimental observation in different radar frequency bands. The temporal behavior of PMWE response to HF pump heating can be employed to diagnose the charged dust layer associated with Mesospheric Smoke Paricles (MSP). Specifically, th...
متن کاملThe thermal and dynamical state of the atmosphere during polar mesosphere winter echoes
In January 2005, a total of 18 rockets were launched from the Andøya Rocket Range in Northern Norway (69 N) into strong VHF radar echoes called “Polar Mesosphere Winter Echoes” (PMWE). The echoes were observed in the lower and middle mesosphere during large solar proton fluxes. In general, PMWE occur much more seldom compared to their summer counterparts PMSE (typical occurrence rates at 69 N a...
متن کاملRocket measurements of positive ions during polar mesosphere winter echo conditions
On 18 January 2005, two small, instrumented rockets were launched from Andøya Rocket Range (69.3◦ N, 16◦ E) during conditions with Polar Mesosphere Winter Echoes (PMWE). Each of the rockets was equipped with a Positive Ion Probe (PIP) and a Faraday rotation/differential absorption experiment, and was launched as part of a salvo of meteorological rockets measuring temperature and wind using fall...
متن کاملPolar 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...
متن کاملEISCAT and ESRAD radars observations of polar mesosphere
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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تاریخ انتشار 2007