Empirical model of the inner magnetosphere H+ pitch angle distributions

2005 ◽  
pp. 283-291 ◽  
Author(s):  
Jacopo De Benedetti ◽  
Anna Milillo ◽  
Stefano Orsini ◽  
Alessandro Mura ◽  
Elisabetta De Angelis ◽  
...  
Keyword(s):  
Empirical Model ◽  
Pitch Angle ◽  
Inner Magnetosphere

scholarly journals Empirical model of proton fluxes in the equatorial inner magnetosphere: Development

2001 ◽  
Vol 106 (A11) ◽  
pp. 25713-25729 ◽  
Author(s):  
A. Milillo ◽  
S. Orsini ◽  
I. A. Daglis
Keyword(s):  
Empirical Model ◽  
Inner Magnetosphere ◽  
Proton Fluxes

scholarly journals On the origin of low‐energy electrons in the inner magnetosphere: Fluxes and pitch‐angle distributions

2017 ◽  
Vol 122 (2) ◽  
pp. 1789-1802 ◽  
Author(s):  
M. H. Denton ◽  
G. D. Reeves ◽  
B. A. Larsen ◽  
R. H. W. Friedel ◽  
M. F. Thomsen ◽  
...  
Keyword(s):  
Pitch Angle ◽  
Low Energy ◽  
Inner Magnetosphere ◽  
Low Energy Electrons

scholarly journals Magnetic field line curvature induced pitch angle diffusion in the inner magnetosphere

2008 ◽  
Vol 113 (A3) ◽  
pp. n/a-n/a ◽  
Author(s):  
S. L. Young ◽  
R. E. Denton ◽  
B. J. Anderson ◽  
M. K. Hudson
Keyword(s):  
Magnetic Field ◽  
Field Line ◽  
Magnetic Field Line ◽  
Pitch Angle ◽  
Inner Magnetosphere

Empirical model of proton fluxes in the equatorial inner magnetosphere: 2. Properties and applications

2003 ◽  
Vol 108 (A5) ◽  
Author(s):  
A. Milillo ◽  
S. Orsini ◽  
D. C. Delcourt ◽  
A. Mura ◽  
S. Massetti ◽  
...  
Keyword(s):  
Empirical Model ◽  
Inner Magnetosphere ◽  
Proton Fluxes

scholarly journals Characterising electron butterfly pitch angle distributions in the magnetosphere through observations and simulations

2013 ◽  
Vol 31 (2) ◽  
pp. 305-314 ◽  
Author(s):  
M. M. Klida ◽  
T. A. Fritz
Keyword(s):  
Lorentz Force ◽  
Significant Role ◽  
Pitch Angle ◽  
Radial Distance ◽  
Equatorial Zone ◽  
Electron Spectrometer ◽  
Inner Magnetosphere ◽  
Different Shapes ◽  
Modelling Effort ◽  
Polar Satellite

Abstract. The Imaging Electron Spectrometer (IES) on the Polar satellite has measured the average characteristics of the equatorial electron pitch angle distributions (PADs) in the midnight sector as a function of radial distance out to the 9 RE apogee of the Polar satellite. Depressions in the observed fluxes of electrons occur with pitch angles around 90° in the equatorial zone, while the more field-aligned electrons remain largely unchanged. The orbital precessions of the satellite have allowed much of the inner equatorial magnetosphere to be observed. Statistically, butterfly PADs with different shapes are observed selectively in different regions, which can provide insight to their source and possible history. Electron paths of varied pitch angles were modelled using Runge-Kutta approximations of the Lorentz force in a Tsyganenko (T96) simulated magnetosphere. The resulting drift paths suggest that the process of magnetopause shadowing plays a significant role in the loss of these electrons. Case studies of the drifting patterns of electrons with varied pitch angles were simulated from Polar's orbit when a butterfly PAD was observed on 3 October 2002 at an altitude near 9 RE and on 12 September 2000 at an altitude near 6 RE. These two locations represent regions on each side of the boundary of stable trapping. The modelling effort strongly suggests that magnetopause shadowing does play a significant role in the loss of equatorially drifting electrons from the outer regions of the inner magnetosphere.

scholarly journals REPAD: An empirical model of pitch angle distributions for energetic electrons in the Earth's outer radiation belt

2014 ◽  
Vol 119 (3) ◽  
pp. 1693-1708 ◽  
Author(s):  
Yue Chen ◽  
Reiner H. W. Friedel ◽  
Michael G. Henderson ◽  
Seth G. Claudepierre ◽  
Steven K. Morley ◽  
...  
Keyword(s):  
Empirical Model ◽  
Pitch Angle ◽  
Radiation Belt ◽  
Outer Radiation Belt ◽  
Energetic Electrons

Energy-dependent Boundaries of Earth's Radiation Belt Electron Slot Region

2021 ◽  
Vol 922 (2) ◽  
pp. 246
Author(s):  
Yang Mei ◽  
Yasong Ge ◽  
Aimin Du ◽  
Xudong Gu ◽  
Danny Summers ◽  
...  
Keyword(s):  
Empirical Model ◽  
Radiation Belt ◽  
Lower Boundary ◽  
Recovery Process ◽  
Compression Process ◽  
Inner Magnetosphere ◽  
P Index ◽  
Energy Dependent ◽  
Geomagnetic Activities ◽  
Dependent Processes

Abstract The variations in radiation belt boundaries reflect competition between acceleration and loss physical processes of energetic electrons, which is an important issue for radiation belts of planets with an internal magnetic field (e.g., Earth, Jupiter, and Saturn). Based on high-quality measurements from Van Allen Probes spanning the years 2014–2018, we develop an empirical model of the energy-dependent boundaries of Earth's electron radiation belt slot region, showing that the lower boundary follows a logarithmic function of the electron energy while the upper boundary is controlled by two competing energy-dependent processes, namely compression and recovery. The compression process relates linearly to a 15 hr averaged Kp index, while the recovery process is found to be approximately proportional to time. Detailed data-model comparisons demonstrate that our model, using only the Kp index and time epoch as inputs, reconstructs the slot region boundaries in real time for 200 keV to 2 MeV electrons under varying geomagnetic conditions. Such a data-driven empirical model is prerequisite to understanding the dynamic changes of the slot region in response to both solar and geomagnetic activities. The model can be readily incorporated into future global simulations of radiation belt electron dynamics in Earth's inner magnetosphere and provide new insights into the study of Saturn's and Jupiter's radiation belt variability.

scholarly journals An Empirical Model of Radiation Belt Electron Pitch Angle Distributions Based On Van Allen Probes Measurements

2018 ◽  
Vol 123 (5) ◽  
pp. 3493-3511 ◽  
Author(s):  
H. Zhao ◽  
R. H. W. Friedel ◽  
Y. Chen ◽  
G. D. Reeves ◽  
D. N. Baker ◽  
...  
Keyword(s):  
Empirical Model ◽  
Pitch Angle ◽  
Radiation Belt ◽  
Van Allen Probes

Equatorial pitch angle distributions in Earth's radiation belts: an empirical model from Van Allen Probes data

2020 ◽  
Author(s):  
Artem Smirnov ◽  
Yuri Shprits ◽  
Hayley Allison ◽  
Nikita Aseev
Keyword(s):  
Solar Activity ◽  
Empirical Model ◽  
Pitch Angle ◽  
Electron Flux ◽  
Dynamic Pressure ◽  
Radiation Belts ◽  
Data Set ◽  
Van Allen Probes ◽  
Flux Measurements ◽  
Solar Wind Parameters

<p><span>Earth’s radiation belts comprise complex and dynamic systems, depending substantially on solar activity. The pitch angle distributions (PADs) play an important role for radiation belts modelling, as they yield information on the particle transport, source and loss processes. Yet, many missions flying in the radiation belts provide omni-directional or uni-directional electron flux measurements and do not resolve pitch angles. We propose an empirical model of the equatorial PADs and a method to retrieve PADs from omni-directional flux measurements at different energies and locations along the inclined orbits. We use the entire dataset of MagEIS and REPT instruments aboard the Van Allen Probes (RBSP) mission to analyze the equatorial pitch angle distributions in the energy range from 30 keV to 6.2 MeV. The fitting method resolves all main types of PADs, including butterfly and cap distributions, and the resulting coefficients are directly related to the PAD shapes. The developed model can be used to obtain pitch angle resolved fluxes for GPS, Arase and other missions. The proposed algorithm is applied to the GPS electron flux data set to obtain the pitch-angle resolved fluxes, which are compared to the RBSP data at a number of GPS-RBSP conjunctions. The proposed model also allows one to reconstruct the pitch-angle resolved data using LEO measurements. The dynamics of the fitting coefficients based on solar activity is discussed with respect to AE, Kp, Dst indices and solar wind parameters: velocity, density and dynamic pressure.</span></p>

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