MULTI-RADAR OBSERVATIONS OF POLAR MESOSPHERE SUMMER ECHOES DURING THE PHOCUS CAMPAIGN ON 21 JULY 2011

摘要

On the morning of July 21, 2011, the PHOCUS sounding rocket was launched from Esrange, Sweden, into noctilucent clouds (NLC) and polar mesosphere summer echoes (PMSE). We show PMSE observations during the entire day by three atmospheric radars: ESRAD located at the launching site, MORRO located at Ramfjordmoen and MAARSY at Andenes, both in Norway. We found that waves with periods of several hours are observed by all three radars in the PMSE strength. The PMSE spectral widths are in the range of 2-10 m/s and increase with increasing altitude for all radars. Strong PMSE at ESRAD at the lower heights are highly aspect sensitive and have narrow spectra which is a signature of quasi-specular scatter.