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Journal Article

An Empirical Model of the Equatorial Electron Pitch Angle Distributions in Earth’s Outer Radiation Belt

Authors
/persons/resource/asmirnov

Smirnov,  Artem
2.7 Space Physics and Space Weather, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/yshprits

SHPRITS,  YURI
2.7 Space Physics and Space Weather, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/haylis

Allison,  Hayley J.
2.7 Space Physics and Space Weather, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/naseev

Aseev,  N.
2.7 Space Physics and Space Weather, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Drozdov,  Alexander
External Organizations;

Kollmann,  Peter
External Organizations;

/persons/resource/dedong

Wang,  D.
2.7 Space Physics and Space Weather, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Saikin,  Anthony
External Organizations;

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Fulltext (public)

5010003.pdf
(Publisher version), 5MB

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Citation

Smirnov, A., SHPRITS, Y., Allison, H. J., Aseev, N., Drozdov, A., Kollmann, P., Wang, D., Saikin, A. (2022): An Empirical Model of the Equatorial Electron Pitch Angle Distributions in Earth’s Outer Radiation Belt. - Space Weather, 20, 9, e2022SW003053.
https://doi.org/10.1029/2022SW003053


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5010003
Abstract
In this study we present an empirical model of the equatorial electron pitch angle distributions (PADs) in the outer radiation belt based on the full data set collected by the Magnetic Electron Ion Spectrometer (MagEIS) instrument onboard the Van Allen Probes in 2012-2019. The PADs are fitted with a combination of the first, third and fifth sine harmonics. The resulting equation resolves all PAD types found in the outer radiation belt (pancake, flat-top, butterfly and cap PADs) and can be analytically integrated to derive omnidirectional flux. We introduce a two-step modeling procedure that ensures a continuous dependence on L, MLT and activity, parametrized by the solar wind dynamic pressure, for the first time. We propose two methods to reconstruct equatorial electron flux using the model. The first approach requires two uni-directional flux observations and is applicable to low-PA data. The second method can be used to reconstruct the full equatorial PADs from a single uni- or omnidirectional measurement at off-equatorial latitudes. The model can be used for converting the long-term data sets of the omnidirectional electron fluxes to phase space density in terms of adiabatic invariants, for physics-based modeling in the form of boundary conditions, and for data assimilation purposes.