Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 39, issue 1
Articles | Volume 39, issue 1
https://doi.org/10.5194/angeo-39-181-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-39-181-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 39, issue 1
ANGEO Communicates
 | 
24 Feb 2021
ANGEO Communicates |  | 24 Feb 2021

Seasonal dependence of the Earth's radiation belt – new insights

Rajkumar Hajra

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Cited articles

Baker, D. N., Blake, J. B., Klebesadel, R. W., and Higbie, P. R.: Highly relativistic electrons in the Earth's outer magnetosphere: 1. Lifetimes and temporal history 1979–1984, J. Geophys. Res.-Space, 91, 4265–4276, https://doi.org/10.1029/JA091iA04p04265, 1986. a
Baker, D. N., Mason, G. M., Figueroa, O., Colon, G., Watzin, J. G., and Aleman, R. M.: An overview of the Solar Anomalous, and Magnetospheric Particle Explorer (SAMPEX) mission, IEEE T. Geosci Remote, 31, 531–541, 1993. a
Baker, D. N., Kanekal, S. G., Pulkkinen, T. I., and Blake, J. B.: Equinoctial and solstitial averages of magnetospheric relativistic electrons: A strong semiannual modulation, Geophys. Res. Lett., 26, 3193–3196, https://doi.org/10.1029/1999GL003638, 1999. a, b
Baker, D. N., Erickson, P. J., Fennell, J. F., Foster, J. C., Jaynes, A. N., and Verronen, P. T.: Space Weather Effects in the Earth's Radiation Belts, Space Sci. Rev., 214, https://doi.org/10.1007/s11214-017-0452-7, 2018. a
Boller, B. R. and Stolov, H. L.: Kelvin–Helmholtz instability and the semiannual variation of geomagnetic activity, J. Geophys. Res.-Space, 75, 6073–6084, https://doi.org/10.1029/JA075i031p06073, 1970. a
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Geomagnetic activity is known to exhibit semi-annual variation with larger occurrences during equinoxes. A similar seasonal feature was reported for relativistic (∼ MeV) electrons throughout the entire outer zone radiation belt. Present work, for the first time reveals that electron fluxes increase with an ∼ 6-month periodicity in a limited L-shell only with large dependence in solar activity cycle. In addition, flux enhancements are not essentially equinoctial.
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