A collimator for measurements of the loss cone flux of energetic electrons

2011 ◽  
Author(s):  
James D. Sullivan ◽  
Charles W. Parker
Keyword(s):  
Loss Cone ◽  
Energetic Electrons

scholarly journals Modeling whistler wave generation regimes in magnetospheric cyclotron maser

2004 ◽  
Vol 22 (10) ◽  
pp. 3561-3570 ◽  
Author(s):  
D. L. Pasmanik ◽  
A. G. Demekhov ◽  
V. Y. Trakhtengerts ◽  
M. Parrot
Keyword(s):  
Source Parameters ◽  
Energetic Electron ◽  
Low Frequency ◽  
Wave Generation ◽  
Whistler Wave ◽  
Particle Precipitation ◽  
Loss Cone ◽  
Energetic Electrons ◽  
Cyclotron Maser ◽  
Different Characteristics

Abstract. Numerical analysis of the model for cyclotron instability in the Earth's magnetosphere is performed. This model, based on the self-consistent set of equations of quasi-linear plasma theory, describes different regimes of wave generation and related energetic particle precipitation. As the source of free energy the injection of energetic electrons with transverse anisotropic distribution function to the interaction region is considered. A parametric study of the model is performed. The main attention is paid to the analysis of generation regimes for different characteristics of energetic electron source, such as the shape of pitch angle distributions and its intensity. Two mechanisms of removal of energetic electrons from a generation region are considered, one is due to the particle precipitation through the loss cone and another one is related to the magnetic drift of energetic particles. It was confirmed that two main regimes occur in this system in the presence of a constant particle source, in the case of precipitation losses. At small source intensity relaxation oscillations were found, whose parameters are in good agreement with simplified analytical theory developed earlier. At a larger source intensity, transition to a periodic generation occurs. In the case of drift losses the regime of self-sustained periodic generation regime is realized for source intensity higher than some threshold. The dependencies of repetition period and dynamic spectrum shape on the source parameters were studied in detail. In addition to simple periodic regimes, those with more complex spectral forms were found. In particular, alteration of spikes with different spectral shape can take place. It was also shown that quasi-stationary generation at the low-frequency band can coexist with periodic modulation at higher frequencies. On the basis of the results obtained, the model for explanation of quasi-periodic whistler wave emissions is verified.

scholarly journals Low altitude energetic electron lifetimes after enhanced magnetic activity as deduced from SAC-C and DEMETER data

2010 ◽  
Vol 28 (3) ◽  
pp. 849-859 ◽  
Author(s):  
S. Benck ◽  
L. Mazzino ◽  
M. Cyamukungu ◽  
J. Cabrera ◽  
V. Pierrard
Keyword(s):  
Pitch Angle ◽  
Energetic Electron ◽  
Magnetic Activity ◽  
Decay Rates ◽  
Data Sets ◽  
Quiet Time ◽  
Loss Cone ◽  
Energetic Electrons ◽  
Low Altitude ◽  
The Difference

Abstract. When flux enhancements of energetic electrons are produced as a consequence of geomagnetic storm occurrence, they tend to vanish gradually when the magnetic activity calms down and the fluxes decay to quiet-time levels. We use SAC-C and DEMETER low altitude observations to estimate the energetic electron lifetimes (E=0.16–1.4 MeV, L=1.6–5, B=0.22–0.46 G) and compare the decay rates to those observed at high altitude. While crossing the radiation belts at high latitude, the SAC-C and DEMETER instruments sample particles with small equatorial pitch angles (αeq<18° for L>2.5) whereas the comparison is done with other satellite data measured mainly in the equatorial plane (for αeq>75°). While in the inner belt and in the slot region no significant lifetime differences are observed from the data sets with different αeq, in the outer belt, for the least energetic electrons (<500 keV), the lifetimes are up to ~3 times larger for the electrons with the equatorial pitch-angle close to the loss cone than for those mirroring near the equator. The difference decreases with increasing energy and vanishes for energies of about 1 MeV.

Modelling Energetic Electrons by a Kappa-Loss-Cone Distribution at Geostationary Orbit

2007 ◽  
Vol 24 (7) ◽  
pp. 2006-2009 ◽  
Author(s):  
Xiao Fu-Liang ◽  
Zhou Qing-Hua ◽  
He Hui-Yong
Keyword(s):  
Geostationary Orbit ◽  
Loss Cone ◽  
Energetic Electrons

Analytic model of the energy distribution for energetic electrons in HiPIMS

2015 ◽  
Author(s):  
Sara Gallian ◽  
Jan Trieschmann ◽  
Thomas Mussenbrock ◽  
William N. G. Hitchon ◽  
Ralf Peter Brinkmann
Keyword(s):  
Energy Distribution ◽  
Analytic Model ◽  
Energetic Electrons

scholarly journals Magnetic Fields in the Lower Corona Associated with the Expanding Limb Burst On March 30th 1969 Inferred from the Microwave High-Resolution Observations

1971 ◽  
Vol 43 ◽  
pp. 413-416 ◽  
Author(s):  
Shinzo Énomé ◽  
Haruo Tanaka
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Magnetic Fields ◽  
The West ◽  
Lower Corona ◽  
Energetic Electrons ◽  
West Limb ◽  
Flare Region ◽  
Solar Microwave ◽  
Solar Microwave Burst

An expansion of the source of a great solar microwave burst was observed a little beyond the west limb on March 30, 1969. This expansion is interpreted in terms of diffusion of energetic electrons in a turbulent magnetic field in the flare region. The height of the source is estimated to have been 104 km.

Probing the Reaction Mechanisms Involved in the Decomposition of Solid 1,3,5-Trinitro-1,3,5-triazinane by Energetic Electrons

2019 ◽  
Vol 123 (44) ◽  
pp. 9479-9497 ◽  
Author(s):  
Santosh K. Singh ◽  
Cheng Zhu ◽  
Vasant Vuppuluri ◽  
Steven F. Son ◽  
Ralf I. Kaiser
Keyword(s):  
Reaction Mechanisms ◽  
Energetic Electrons
Sign in / Sign up

Export Citation Format

Share Document