scholarly journals Improved outer boundary conditions for outer radiation belt data assimilation using THEMIS-SST data and the Salammbo-EnKF code

2015 ◽  
Vol 120 (7) ◽  
pp. 5608-5622 ◽  
Author(s):  
V. Maget ◽  
A. Sicard-Piet ◽  
S. Bourdarie ◽  
D. Lazaro ◽  
D. L. Turner ◽  
...  
Keyword(s):  
Data Assimilation ◽  
Boundary Conditions ◽  
Radiation Belt ◽  
Outer Boundary ◽  
Outer Radiation Belt

scholarly journals Constraining the Location of the Outer Boundary of Earth’s Outer Radiation Belt

2021 ◽  
Author(s):  
T. Bloch ◽  
C. E. J. Watt ◽  
M. J. Owens ◽  
R. L. Thompson ◽  
O. Agiwal
Keyword(s):  
Radiation Belt ◽  
Outer Boundary ◽  
Outer Radiation Belt

How Coherent are Flux Variations in the Outer Van Allen Radiation Belt?

2020 ◽  
Author(s):  
Samuel Walton ◽  
Colin Forsyth ◽  
Iain Jonathan Rae ◽  
Clare Watt ◽  
Richard Horne ◽  
...  
Keyword(s):  
Geomagnetic Activity ◽  
Radiation Belt ◽  
Geomagnetic Storms ◽  
Outer Boundary ◽  
Radial Distance ◽  
Radiation Belts ◽  
Outer Radiation Belt ◽  
Electron Population ◽  
Storms And Substorms ◽  
Using Data

<p>The electron population inside Earth’s outer radiation belt is highly variable and typically linked to geomagnetic activity such as storms and substorms. These variations can differ with radial distance, such that the fluxes at the outer boundary are different from those in the heart of the belt. Using data from the Proton Electron Telescope (PET) on board NASA’s Solar Anomalous Magnetospheric Particle Explorer (SAMPEX), we have examined the correlation between electron fluxes at all L's within the radiation belts for a range of geomagnetic conditions, as well as longer-term averages. Our analysis shows that fluxes at L≈2-4 and L≈4-10 are well correlated within these regions, with coefficients in excess of 80%, however, the correlation between these two regions is low. These correlations vary between storm-times and quiet-times. We examine whether, and to what extent this correlation is related to the level of enhancement of the outer radiation belt during geomagnetic storms, and whether the plasmapause plays any role defining the different regions of correlated flux.</p>

scholarly journals Constraining the Location of the Outer Boundary of Earth's Outer Radiation Belt

2021 ◽  
Author(s):  
Téo Bloch ◽  
Clare E. J. Watt ◽  
Mathew J Owens ◽  
Rhys Leighton Thompson ◽  
Omakshi Agiwal
Keyword(s):  
Radiation Belt ◽  
Outer Boundary ◽  
Outer Radiation Belt

scholarly journals OSCILLATIONS OF THE OUTER BOUNDARY OF THE OUTER RADIATION BELT DURING SAWTOOTH OSCILLATIONS

2006 ◽  
Vol 23 (3) ◽  
pp. 217-226
Author(s):  
Jae-Hun Kim ◽  
Kyung-Chan Kim ◽  
Dae-Young Lee ◽  
Hee-Jeong Kim
Keyword(s):  
Radiation Belt ◽  
Outer Boundary ◽  
Outer Radiation Belt ◽  
Sawtooth Oscillations

scholarly journals A relation between the locations of the polar boundary of outer electron radiation belt and the equatorial boundary of the auroral oval

2018 ◽  
Author(s):  
Maria O. Riazanteseva ◽  
Elizaveta E. Antonova ◽  
Marina V. Stepanova ◽  
Boris V. Marjin ◽  
Ilia A. Rubinshtein ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Geomagnetic Storms ◽  
Outer Boundary ◽  
Background Level ◽  
Auroral Oval ◽  
External Boundary ◽  
Electron Radiation ◽  
Outer Electron ◽  
Outer Radiation Belt ◽  
The Difference

Abstract. Finding the position of the external boundary of the outer electron radiation belt, relative to the position of the auroral oval, is a long-standing problem. Here we analyze it using data of the Meteor-M No. 1 auroral satellite for the period from 11 November 2009 to 27 March 2010. The geomagnetic conditions during the analyzed period were comparatively quiet. Meteor-M No. 1 has a polar solar-synchronous circular orbit with an altitude of ~ 832 km, a period of 101.3 min, and an inclination of 98°. We analyze flux observations of auroral electrons with energies between 0.03 and 16 keV, and electrons with energies > 100 keV, measured simultaneously by the GGAK-M set of instruments, composed by semiconductors, scintillator detectors, and electrostatic analyzers. We assume that at the absence of geomagnetic storms the external boundary of the outer radiation belt can be identified as a decrease in the count rate of precipitating energetic electrons to the background level. It was found that this boundary can be located both inside the auroral oval or to the equator from the equatorial boundary of the auroral precipitations. It was also found that for disturbed geomagnetic conditions the external boundary of the outer radiation belt is almost always located inside the auroral oval. We observe that the difference between the position of the outer boundary of the outer radiation belt and the position of the equatorial boundary of auroral precipitations depends on the AE and PC indexes of geomagnetic activity. The implications of these results in the analysis of the formation of the outer radiation belt is discussed.

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