Characteristics of polar mesosphere summer echoes (PMSE) observed with the EISCAT 224 MHz radar and possible explanations of their origin |
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| Institution: | 1. Institute of Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens, Greece;2. Bulgarian Academy of Sciences, Sofia, Bulgaria;3. Institute of Information and Communication Technologies, Bulgarian Academy of Sciences, Sofia, Bulgaria;1. State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China;2. China-Brazil Joint Laboratory for Space Weather, Chinese Academy of Sciences, São Jose dos Campos, Brazil;3. School of Physics and Electronics Engineering, Hainan Normal University, Haikou 571158, China;1. Department of Physical Sciences, Landmark University, PMB 1001, Omu-Aran, Kwara State, Nigeria;2. Department of Physics, Olabisi Onabanjo University, P.M.B. 2002, Ago Iwoye, Nigeria;1. Institute of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211100, China;2. State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, China;1. Space Research Institute, Prosp. Akad. Glushkova 40, Build. 4/1, 03187, MSP Kyiv-187, Ukraine;2. Institute of Radio Astronomy NAS of Ukraine, Chervonopraporna St. 4, 61002, Kharkiv, Ukraine |
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| Abstract: | We describe experiments carried out with the EISCAT VHF radar during the MAC/SINE campaign. These experiments included observations of the polar mesosphere summer echoes (PMSE), which were studied with a high spectral resolution program. The fine structure of the spectra imply that very thin and non-random transient structures of reflectivity occur frequently in the mesopause region. We find no clear relation between the echo power and the coherence time which could support the hypothesis of scatter from turbulence or partial reflection. In addition, the estimates of radar reflectivity let us discard incoherent scatter and pure turbulence scatter as the cause of the PMSE. We also discuss the relation of the PMSE and cluster ions, electric fields, charge accumulation and atmospheric gravity waves. |
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