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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 25 May 2020

Submitted as: regular paper | 25 May 2020

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This preprint is currently under review for the journal ANGEO.

Variability of Relativistic Electron Flux (E > 2 MeV) during Geo-Magnetically Quiet and Disturbed days: A Case Study

Tulsi Thapa1,2, Binod Adhikari1,3, Prashrit Baruwal4, and Kiran Pudasainee1 Tulsi Thapa et al.
  • 1Departmentof Physics, St. Xavier's College, Maitighar, Kathmandu, Nepal
  • 2National Astronomical Observatories of China, University of Chinese Academy of Sciences, China
  • 3Department of Physics, Patan Multiple Campus, Tribhuvan University, Kathmandu, Nepal
  • 4Central Department of Physics, University Campus, Tribhuvan University, Kirtipur, Nepal

Abstract. We analyzed the relativistic electron fluxes (E > 2 MeV) during three different geomagnetic storms: moderate, intense, and super-intense and one geo-magnetically quiet period. We have opted Continuous wavelet analysis and cross-correlation technique to extend current understanding and of the radiation-belt dynamics. We found that the fluctuation of relativistic electron fluxes dependent basically on prolonged southward interplanetary magnetic field IMF-Bz. Cross-correlation analysis depicted that SYM-H does not show a strong connection either with relativistic electron enhancement events or persistent depletion events. Our result supports the fact that geomagnetic storms are not a primary factor that pumps up the radiation belt. In fact they seem event specific; either depletion or enhancement or slight effect on the outer radiation belt might be observed depending on the event. Solar wind pressure and velocity were found to be highly and positively correlated with relativistic electron. We found that, the count of relativistic electron flux (> 2 MeV) decreases during the main phase of geomagnetic storm with the increase in – from quiet to super intense storm – geomagnetic storm conditions (Table 1). However, Psw was found to be weakly correlated in case of intense storms following an abrupt increase of electron flux for ~ 4 hrs, which is interesting and unique.

Tulsi Thapa et al.

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Tulsi Thapa et al.

Tulsi Thapa et al.


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