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Polar Mesosphere Winter Echoes by ESRAD and EISCAT during 29/30 October 2003.
Belova E., Ekeberg J., Haggstrom I., Kirkwood S., Nilsson H., Osepian A.,
Both the ESRAD (52 MHz) and EISCAT VHF (224 MHz) radars observed thin layers of enhanced radar scatter between 60 and 70 km height during the solar proton event on 29/30 October 2003. These layers are of the type frequently reported from the ESRAD radar during solar proton events in the last 4 years and named as Polar Mesosphere Winter Echoes (PMWE). Comparison of earlier ESRAD layers with results from other instruments (lidar, sounding rockets) has led to the conclusion that they cannot be explained by neutral turbulence and may be associated with layers of dusty plasma. Here we make a detailed comparison between the observations by ESRAD and EISCAT on 29/30 October 2003, with the background ion-chemistry from the PGI model, and with theoretical calculations of the likely effects of turbulence, to see whether the observations support the suggestion of a dusty plasma layer.