Proton loss of inner radiation belt during geomagnetic storm of 2018 based on CSES satellite observation

Electron filling and proton loss in radiation belts and SAA during 2018 storm based on ZH-1 satellite observations

10.5194/egusphere-egu21-1529 ◽

2021 ◽

Author(s):

Zhenxia Zhang

Keyword(s):

Geomagnetic Storm ◽

Radiation Belt ◽

Electron Flux ◽

Outer Boundary ◽

Energetic Electron ◽

High Energy ◽

Radiation Belts ◽

High Energy Particle ◽

Van Allen Probes ◽

Proton Loss

Based on data from the ZH-1 satellites, companied with Van Allen Probes and NOAA observations, we analyze the high energy particle evolutions in radiation belts, slot region and SAA during August 2018 major geomagnetic storm (minimum Dst &#8776; &#8722;190 nT).&#160;&#160;&#160;1) Relativistic electron enhancements in extremely low L-shell regions (reaching L &#8764; 3) were observed during storm. Contrary to what occurs in the outer belt, such an intense and deep electron penetration event is rare and more interesting. Strong whistler-mode (chorus and hiss) waves, with amplitudes 81&#8211;126 pT, were also observed in the extremely low L-shell simultaneously (reaching L &#8764; 2.5) where the plasmapause was suppressed. The bounce-averaged diffusion coefficient calculations support that the chorus waves can play a significantly important role in diffusing and accelerating the 1&#8211;3 MeV electrons even in such low L-shells during storms.2) A robust evidence is clearly demonstrated that the energetic electron flux with energy 30&#8764;600 keV are increased by 2&#8764;3 times in the inner radiation belt near equator and SAA region on dayside during the major geomagnetic storm. This is the first time that the 100s keV electron flux enhancement is reported to be potentially induced by the interaction with magnetosonic waves in extremely low L-shells (L<2) observed by Van Allen Probes. Proton loss in outer boundary of inner radiation belt takes place in energy of 2~220 MeV extensively during the occurrence of this storm but the loss mechanism is energy dependence which is consistent with some previous studies. It is confirmed that the magnetic field line curvature scattering plays a significant role in the proton loss phenomenon in energy 30-100 MeV during this storm. This work provides a beneficial help to comprehensively understand the charged particles trapping and loss in SAA region and inner radiation belt dynamic physics.

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Competing source and loss mechanisms due to wave-particle interactions in Earth's outer radiation belt during the 30 September to 3 October 2012 geomagnetic storm

Journal of Geophysical Research Space Physics ◽

10.1002/2014ja019770 ◽

2014 ◽

Vol 119 (3) ◽

pp. 1960-1979 ◽

Cited By ~ 65

Author(s):

D. L. Turner ◽

V. Angelopoulos ◽

W. Li ◽

J. Bortnik ◽

B. Ni ◽

...

Keyword(s):

Geomagnetic Storm ◽

Radiation Belt ◽

Particle Interactions ◽

Outer Radiation Belt ◽

Wave Particle Interactions ◽

Loss Mechanisms

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PROBLEMS OF THE OUTER RADIATION BELT FORMATION AND TOPOLOGICAL FEATURES OF HIGH LATITUDE MAGNETOSPHERE

PHYSICS OF AURORAL PHENOMENA ◽

10.51981/2588-0039.2021.44.001 ◽

2021 ◽

Vol 44 ◽

pp. 7-11

Author(s):

Elena Antonova ◽

Keyword(s):

Geomagnetic Storm ◽

High Latitude ◽

Radiation Belt ◽

Ring Current ◽

Outer Part ◽

Auroral Oval ◽

Plasma Pressure ◽

Relativistic Electrons ◽

Outer Radiation Belt ◽

Topological Features

We analyzed the problems of formation of the outer radiation belt (ORB) taking into consideration the latest changes in our understanding of the high-latitude magnetospheric topology. This includes strong evidence that the auroral oval maps to the outer part of the ring current, meanwhile the ORB polar boundary maps inside the auroral oval. Our analysis also includes the variation of the plasma pressure distribution and the time of the acceleration of relativistic electrons during geomagnetic storm. It is shown that the maximum of ORB is formed after the geomagnetic storm in the region of plasma pressure maximum. The position of this maximum agrees with the prediction of the ORB formation theory based on the analysis of ring current development during storm. We emphasize the role of adiabatic processes in the ORB dynamics and the importance of the substorm injections during storm recovery phase for the formation of enhanced fluxes of ORB electrons after the storm.

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Radiation belt electron precipitation into the atmosphere: Recovery from a geomagnetic storm

Journal of Geophysical Research Atmospheres ◽

10.1029/2007ja012383 ◽

2007 ◽

Vol 112 (A11) ◽

pp. n/a-n/a ◽

Cited By ~ 57

Author(s):

Craig J. Rodger ◽

Mark A. Clilverd ◽

Neil R. Thomson ◽

Rory J. Gamble ◽

Annika Seppälä ◽

...

Keyword(s):

Geomagnetic Storm ◽

Radiation Belt ◽

Electron Precipitation

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Simulations of inner radiation belt proton loss during geomagnetic storms

Journal of Geophysical Research Space Physics ◽

10.1002/2015ja021568 ◽

2015 ◽

Vol 120 (11) ◽

pp. 9323-9333 ◽

Cited By ~ 6

Author(s):

M. A. Engel ◽

B. T. Kress ◽

M. K. Hudson ◽

R. S. Selesnick

Keyword(s):

Radiation Belt ◽

Geomagnetic Storms ◽

Proton Loss

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

10.5194/angeo-2020-35 ◽

2020 ◽

Author(s):

Tulsi Thapa ◽

Binod Adhikari ◽

Prashrit Baruwal ◽

Kiran Pudasainee

Keyword(s):

Relativistic Electron ◽

Geomagnetic Storm ◽

Radiation Belt ◽

Cross Correlation ◽

Electron Flux ◽

Geomagnetic Storms ◽

Correlation Technique ◽

Outer Radiation Belt ◽

Cross Correlation Analysis ◽

Intense Storm

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.

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Discovering the Low-Latitude Ionospheric Trough Associated With the Inner Radiation Belt

10.21203/rs.3.rs-143325/v1 ◽

2021 ◽

Author(s):

Alexander Karpachev

Keyword(s):

Geomagnetic Storm ◽

Radiation Belt ◽

Ring Current ◽

Recovery Phase ◽

Low Latitude ◽

Champ Satellite ◽

Main Ionospheric Trough ◽

Long Time ◽

Late Recovery ◽

First Time

Abstract The dynamics of ionospheric troughs during great geomagnetic storm on April 11–13, 2001 is considered. An analysis is based on measurements of electron density at altitudes of the CHAMP satellite 410–465 km. The subauroral, mid-latitude and low-latitude troughs were observed at nighttime, sometimes simultaneously. The subauroral trough is usually defined as the main ionospheric trough. The mid-latitude trough is associated with the magnetospheric ring current. It appears at the beginning of the storm recovery phase at latitudes of 40–45° GMLat (L=1.7–2.0) and exists for a long time at the late recovery phase at latitudes of the residual ring current 50–55° GMLat (L~2.4–3.0). The low-latitude trough was revealed for the first time. It is developed at the latitudes of the inner radiation belt 34–45° GMLat (L=1.45–2.00). This trough is associated with the precipitation of energetic particles from the inner radiation belt.

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