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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-13
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-13
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 28 Jan 2019

Regular paper | 28 Jan 2019

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Annales Geophysicae (ANGEO).

Characteristics of layered occurrence ratio of polar mesosphere summer echoes observed by EISCAT VHF 224 MHz Radar

Shucan Ge1, Hailong Li1, Tong Xu2, Mengyan Zhu2, Maoyan Wang1, and Lin Meng1 Shucan Ge et al.
  • 1School of Electronic Science and Engineering, University of Electronic Science and Technology of China, 610054, Chengdu, China
  • 2National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, 266107, Qingdao, China

Abstract. Polar Mesosphere Summer Echoes (PMSE) are strong radar echoes observed in polar mesopause during local summer. Measurements of layered PMSE observed by the European Incoherent Scatter Scientific Association Very high frequency (EISCAT VHF) radar from 2004 to 2015 in the latest solar cycle, can be used to study the variations of PMSE occurrence ratio (OR). The seasonal variation of PMSE mono-, double- and tri-layer occurrence ratio was analyzed, and there is different seasonal behavior. A method was given to calculate the PMSE mono-, double- and tri-layer occurrence ratio under different electron density threshold conditions. In addition, the correlation between PMSE layered occurrence ratios and solar 10.7 cm flux index (F10.7), and the correlation between PMSE layered occurrence ratios and geomagnetic K index were analyzed respectively in this study. It can be obtained that PMSE mono-, double- and tri-layer OR are positively correlated with the K index. The correlation coefficient between PMSE mono- and double-layer OR and F10.7 is weak, and the PMSE tri-layer OR has a negative correlation with F10.7.

Shucan Ge et al.
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Short summary
The statistical results of PMSE layered occurrence ratio (OR) observed by EISCAT 224 MHz radar over the period 2004–2015 are given in this paper. The seasonal variation of PMSE mono-, double- and tri-layer occurrence ratio was analyzed. A method was given to calculate the PMSE layered OR under different electron density threshold conditions. The method solves the defect that the measurements of EISCAT radar is discontinuous, which makes a significant breakthrough in the description of the PMSE.
The statistical results of PMSE layered occurrence ratio (OR) observed by EISCAT 224 MHz radar...
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