scholarly journals Pitch angle distribution of relativistic electrons in the inner radiation belt and its relation to equatorial plasma wave turbulence phenomena

2001 ◽  
Vol 28 (5) ◽  
pp. 931-934 ◽  
Author(s):  
Akira Morioka ◽  
Hiroaki Misawa ◽  
Yoshizumi Miyoshi ◽  
Hiroshi Oya ◽  
Masahide Iizima ◽  
...  
Keyword(s):  
Plasma Wave ◽  
Pitch Angle ◽  
Radiation Belt ◽  
Wave Turbulence ◽  
Relativistic Electrons ◽  
Angle Distribution ◽  
Pitch Angle Distribution

scholarly journals Peculiar pitch angle distribution of relativistic electrons in the inner radiation belt and slot region

2014 ◽  
Vol 41 (7) ◽  
pp. 2250-2257 ◽  
Author(s):  
H. Zhao ◽  
X. Li ◽  
J. B. Blake ◽  
J. F. Fennell ◽  
S. G. Claudepierre ◽  
...  
Keyword(s):  
Pitch Angle ◽  
Radiation Belt ◽  
Relativistic Electrons ◽  
Angle Distribution ◽  
Pitch Angle Distribution

The Pitch Angles of Electrons in Jupiter’s Radiation Belt

1976 ◽  
Vol 3 (1) ◽  
pp. 53-55 ◽  
Author(s):  
J. A. Roberts
Keyword(s):  
Radio Emission ◽  
Pitch Angle ◽  
Radiation Belt ◽  
Synchrotron Emission ◽  
Angle Distribution ◽  
Space Probe ◽  
Frequency Range ◽  
Pitch Angle Distribution ◽  
5 Ghz ◽  
Apparent Conflict

The radio emission from Jupiter in the frequency range from ∽ 50 MHz to ∽ 5 GHz is mainly synchrotron emission from electrons in the intense radiation belt which surrounds Jupiter out to several planetary radii. Information about the pitch angles of these electrons can be derived both from the radio observations and from the Pioneer space probe observations. In this communication we discuss the pitch angle distribution inferred from the radio data and the apparent conflict with the Pioneer data.

scholarly journals POLAR spacecraft observations of helium ion angular anisotropy in the Earth's radiation belts

1999 ◽  
Vol 17 (6) ◽  
pp. 723-733 ◽  
Author(s):  
W. N. Spjeldvik ◽  
T. A. Fritz ◽  
J. Chen ◽  
R. B. Sheldon
Keyword(s):  
Local Time ◽  
Pitch Angle ◽  
Radiation Belt ◽  
Radiation Belts ◽  
Magnetic Local Time ◽  
Angle Distribution ◽  
Pitch Angle Distribution ◽  
Helium Ion ◽  
Earth’S Radiation Belt ◽  
Earth's Radiation Belts

Abstract. New observations of energetic helium ion fluxes in the Earth's radiation belts have been obtained with the CAMMICE/HIT instrument on the ISTP/GGS POLAR spacecraft during the extended geomagnetically low activity period April through October 1996. POLAR executes a high inclination trajectory that crosses over both polar cap regions and passes over the geomagnetic equator in the heart of the radiation belts. The latter attribute makes possible direct observations of nearly the full equatorial helium ion pitch angle distributions in the heart of the Earth's radiation belt region. Additionally, the spacecraft often re-encounters the same geomagnetic flux tube at a substantially off-equatorial location within a few tens of minutes prior to or after the equatorial crossing. This makes both the equatorial pitch angle distribution and an expanded view of the local off-equatorial pitch angle distribution observable. The orbit of POLAR also permitted observations to be made in conjugate magnetic local time sectors over the course of the same day, and this afforded direct comparison of observations on diametrically opposite locations in the Earth's radiation belt region at closely spaced times. Results from four helium ion data channels covering ion kinetic energies from 520 to 8200 KeV show that the distributions display trapped particle characteristics with angular flux peaks for equatorially mirroring particles as one might reasonably expect. However, the helium ion pitch angle distributions generally flattened out for equatorial pitch angles below about 45°. Significant and systematic helium ion anisotropy difference at conjugate magnetic local time were also observed, and we report quiet time azimuthal variations of the anisotropy index.Key words. Magnetospheric physics (energetic particles · trapped; magnetospheric configuration and dynamics; plasmasphere)

scholarly journals Evolution of Radiation Belt Electron Pitch Angle Distribution Due to Combined Scattering by Plasmaspheric Hiss and Magnetosonic Waves

2019 ◽  
Vol 46 (6) ◽  
pp. 3033-3042 ◽  
Author(s):  
Man Hua ◽  
Binbin Ni ◽  
Wen Li ◽  
Xudong Gu ◽  
Song Fu ◽  
...  
Keyword(s):  
Pitch Angle ◽  
Radiation Belt ◽  
Angle Distribution ◽  
Pitch Angle Distribution

scholarly journals Gyromagnetic Emission and Absorption: Approximate Formulas of Wide Validity

1984 ◽  
Vol 37 (6) ◽  
pp. 675 ◽  
Author(s):  
PA Robinson ◽  
DB Melrose
Keyword(s):  
Pitch Angle ◽  
Bessel Functions ◽  
Harmonic Number ◽  
Relativistic Electrons ◽  
Angle Distribution ◽  
Pitch Angle Distribution ◽  
Approximate Formulas

Approximate formulas of wide validity are derived for gyro magnetic emission and absorption of gyromagnetic waves by mildly relativistic electrons. An averaged emissivity is defined by replacing the sum over harmonic number by an integral and averaging over the pitch angle distribution of the radiating particles. A method for performing the average over pitch angle without approximation to the Bessel functions is developed and the resulting expressions are then approximated using Wild-Hill formulas which interpolate between the non-relativistic and ultra-relativistic limits.

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