Investigation of PMSE echoes characteristics using the discontinuous EISCAT UHF observation and its relation with space environment
Abdur Rauf 1, Hailong Li1*, Safi Ullah 1, Maoyan Wang 2 & Lin Meng1
1 School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China;
2 School of Physics, University of Electronic Science and Technology of China, Chengdu, 610054, China
The observations of Polar Mesosphere Summer Echoes (PMSE) were carried out using the sporadic data of EISCAT UHF radar during the summer season from 2004 to 2015. There were 25 h of PMSE echoes with EISCAT UHF radar. PMSE echoes were mostly observed only during the early morning and fore-noon time. Moreover, the PMSE echoes are positively correlated with Lyman α radiation, but the correlation is non-significant. The occurrence of PMSE echoes in the early morning and fore-noon time and there positive correlation with Lyman α radiation suggests that solar radiations might be one important factor for PMSE echoes in this study. Very weak positive, but statistically non-significant correlation is found between PMSE occurrence rate and the local geomagnetic K-indices. The variation in the occurrence rate of PMSE and noctilucent clouds (NLC) has matching up to some extent and are positively correlated. This positive correlation might support the earlier proposed idea about the role of ice particle size in producing PMSE echoes at higher frequencies.
PMSE echoes; geomagnetic indices; EISCAT UHF radar