Stormtime Dynamics of the Relativistic Electron Flux in Earth’s Radiation Belts

2011 ◽  
Author(s):  
D. Vassiliadis ◽  
Dimitris Vassiliadis ◽  
Shing F. Fung ◽  
Xi Shao ◽  
Ioannis A. Daglis ◽  
...  
Keyword(s):  
Relativistic Electron ◽  
Electron Flux ◽  
Radiation Belts ◽  
Earth's Radiation Belts

scholarly journals Quantifying the nonlinear dependence of energetic electron fluxes in the Earth's radiation belts with radial diffusion drivers

2021 ◽  
Author(s):  
Adnane Osmane ◽  
Mikko Savola ◽  
Emilia Kilpua ◽  
Hannu Koskinen ◽  
Joseph E. Borovsky ◽  
...  
Keyword(s):  
Solar Wind ◽  
Mutual Information ◽  
Relativistic Electron ◽  
Pearson Correlation ◽  
Radiation Belts ◽  
Nonlinear Dependence ◽  
Wave Power ◽  
Ulf Wave ◽  
Linear And Nonlinear ◽  
Earth's Radiation Belts

Abstract. In this study, we use mutual information to characterise statistical dependencies of seed and relativistic electron fluxes in the Earth's radiation belts on ultra low frequency (ULF) wave power measured on the ground and at geostationary orbit . The benefit of mutual information, in comparison to measures such as the Pearson correlation, lies in the capacity to distinguish nonlinear dependencies from linear ones. After reviewing the property of mutual information and its relationship with the Pearson correlation for Gaussian bivariates of arbitrary correlation, we present a methodology to quantify and distinguish linear and nonlinear statistical dependencies that can be generalised to a wide range of solar wind drivers and magnetospheric responses. We present an application of the methodology by revisiting the case events studied by Rostoker et al. (1998). Our results corroborate the conclusions of Rostoker et al. (1998) that ULF wave power and relativistic electron fluxes are statistically dependent upon one another. However, we find that observed enhancements in relativistic electron fluxes correlate modestly, both linearly and nonlinearly, with the ULF power spectrum when compared with values found in previous studies (Simms et al., 2014), and with values found between seed electrons and ULF wave power for the same case events. Our results are indicative of the importance in incorporating data analysis tools that can quantify and distinguish between linear and nonlinear interdependencies of various solar wind drivers.

scholarly journals Probability of relativistic electron trapping by parallel and oblique whistler-mode waves in Earth's radiation belts

2015 ◽  
Vol 22 (11) ◽  
pp. 112903 ◽  
Author(s):  
A. V. Artemyev ◽  
A. A. Vasiliev ◽  
D. Mourenas ◽  
A. I. Neishtadt ◽  
O. V. Agapitov ◽  
...  
Keyword(s):  
Relativistic Electron ◽  
Radiation Belts ◽  
Electron Trapping ◽  
Whistler Mode ◽  
Whistler Mode Waves ◽  
Earth's Radiation Belts

scholarly journals Empirically estimated electron lifetimes in the Earth's radiation belts: 2. Comparison with theory

2019 ◽  
Author(s):  
Seth G. Claudepierre ◽  
Qianli Ma ◽  
Jacob Bortnik ◽  
Thomas Paul O'Brien ◽  
Joseph F. Fennell ◽  
...  
Keyword(s):  
Radiation Belts ◽  
Earth's Radiation Belts

Relativistic electron flux comparisons at low and high altitudes with fast time resolution and broad spatial coverage

1994 ◽  
Vol 99 (A9) ◽  
pp. 17421 ◽  
Author(s):  
W. L. Imhof ◽  
E. E. Gaines ◽  
J. P. McGlennon ◽  
D. N. Baker ◽  
G. D. Reeves ◽  
...  
Keyword(s):  
Relativistic Electron ◽  
Time Resolution ◽  
Electron Flux ◽  
Fast Time ◽  
High Altitudes ◽  
Spatial Coverage

On the effect of ULF waves on the outer radiation belt during geomagnetic storms

2021 ◽  
Author(s):  
Christopher Lara ◽  
Pablo S. Moya ◽  
Victor Pinto ◽  
Javier Silva ◽  
Beatriz Zenteno
Keyword(s):  
Relativistic Electron ◽  
Radiation Belt ◽  
Geomagnetic Storms ◽  
Cumulative Effect ◽  
Radiation Belts ◽  
Ulf Waves ◽  
Relativistic Electrons ◽  
Relative Role ◽  
Outer Radiation Belt ◽  
Ulf Wave

<p>The inner magnetosphere is a very important region to study, as with satellite-based communications increasing day after day, possible disruptions are especially relevant due to the possible consequences in our daily life. It is becoming very important to know how the radiation belts behave, especially during strong geomagnetic activity. The radiation belts response to geomagnetic storms and solar wind conditions is still not fully understood, as relativistic electron fluxes in the outer radiation belt can be depleted, enhanced or not affected following intense activity. Different studies show how these results vary in the face of different events. As one of the main mechanisms affecting the dynamics of the radiation belt are wave-particle interactions between relativistic electrons and ULF waves. In this work we perform a statistical study of the relationship between ULF wave power and relativistic electron fluxes in the outer radiation belt during several geomagnetic storms, by using magnetic field and particle fluxes data measured by the Van Allen Probes between 2012 and 2017. We evaluate the correlation between the changes in flux and the cumulative effect of ULF wave activity during the main and recovery phases of the storms for different position in the outer radiation belt and energy channels. Our results show that there is a good correlation between the presence of ULF waves and the changes in flux during the recovery phase of the storm and that correlations vary as a function of energy. Also, we can see in detail how the ULF power change for the electron flux at different L-shell We expect these results to be relevant for the understanding of the relative role of ULF waves in the enhancements and depletions of energetic electrons in the radiation belts for condition described.</p>

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