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Sökning: WFRF:(Wang MaoYan)

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1.
  • Ge, ShuCan, et al. (författare)
  • Characteristic analysis of layered PMSEs measured with different elevation angles at VHF based on an experimental case
  • 2021
  • Ingår i: Earth and Planetary Physics. - : Earth and Planetary Physics. - 2096-3955. ; 5:1, s. 42-51
  • Tidskriftsartikel (refereegranskat)abstract
    • Polar Mesosphere Summer Echoes (PMSEs) are very strong radar echoes observed at altitudes near the polar summer mesopause. One of the essential properties of these radar echoes is that they can give useful diagnostic information about the physics of the scattering process. In this paper, the related characteristics of PMSEs measured with the European Incoherent SCATter Very High Frequency (EISCAT VHF) 224 MHz radar on 13-15 July 2010 are studied at different elevation angles from 78 degrees to 90 degrees. It is found that the PMSEs peak power and strongest PMSEs average power occur at the same elevation angles. Also interesting is that the strongest PMSEs occur at off-vertical angles when a PMSEs has a layered (multilayer) structure. And reflection may have more significant effects on PMSEs when there are double or multilayer PMSEs. Possible explanations regarding these observations are discussed.
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2.
  • Ge, ShuCan, et al. (författare)
  • On the radar frequency dependence of polar mesosphere summer echoes
  • 2020
  • Ingår i: Earth and Planetary Physics. - : Earth and Planetary Physics. - 2096-3955. ; 4:6, s. 571-578
  • Tidskriftsartikel (refereegranskat)abstract
    • Polar mesosphere summer echoes (PMSEs) are very strong radar echoes in the polar mesopause in local summer. Here we present the frequency dependence of the volume reflectivity and the effect of energetic particle precipitation on modulated PMSEs by using PMSEs observations carried out by European Incoherent SCATter (EISCAT) heating equipment simultaneously with very high frequency (VHF) radar and ultra high frequency (UHF) radar on 12 July 2007. According to the experimental observations, the PMSEs occurrence rate at VHF was much higher than that at UHF, and the altitude of the PMSEs maximum observed at VHF was higher than that at UHF. Overlapping regions were observed by VHF radar between high energetic particle precipitation and the PMSEs. In addition, high-frequency heating had a very limited impact on PMSEs when the UHF electron density was enhanced because of energetic particle precipitation. In addition, an updated qualitative method was used to study the relationship between volume reflectivity and frequency. The volume reflectivity was found to be inversely proportional to the fourth power of radar frequency. The theoretical and experimental results provide a definitive data foundation for further analysis and investigation of the physical mechanism of PMSEs.
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
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Rauf, Abdur (2)
Li, Hailong (2)
Ge, ShuCan (2)
Xu, Tong (2)
Meng, Lin (2)
Wang, MaoYan (2)
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Ullah, Safi (2)
Broman, Lina (1)
Hannachi, Abdel (1)
Xu, Bin (1)
Zhu, MengYan (1)
Hannachid, Abdel (1)
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Stockholms universitet (2)
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