 |
| Titel |
Significance of Wave-Particle Interaction Analyzer for direct measurements of nonlinear wave-particle interactions |
| VerfasserIn |
Y. Katoh, M. Kitahara, H. Kojima, Y. Omura, S. Kasahara, M. Hirahara, Y. Miyoshi, K. Seki, K. Asamura, T. Takashima, T. Ono |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 31, no. 3 ; Nr. 31, no. 3 (2013-03-19), S.503-512 |
| Datensatznummer |
250019010
|
| Publikation (Nr.) |
 copernicus.org/angeo-31-503-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| In the upcoming JAXA/ERG satellite mission, Wave Particle Interaction
Analyzer (WPIA) will be installed as an onboard software function. We study
the statistical significance of the WPIA for measurement of the energy
transfer process between energetic electrons and whistler-mode chorus
emissions in the Earth's inner magnetosphere. The WPIA measures a relative
phase angle between the wave vector E and velocity vector
v of each electron and computes their inner product W, where
W is the time variation of the kinetic energy of energetic electrons
interacting with plasma waves. We evaluate the feasibility by applying the
WPIA analysis to the simulation results of whistler-mode chorus generation.
We compute W using both a wave electric field vector observed at a fixed
point in the simulation system and a velocity vector of each energetic
electron passing through this point. By summing up Wi of an individual
particle i to give Wint, we obtain significant values of
Wint as expected from the evolution of chorus emissions in the
simulation result. We can discuss the efficiency of the energy exchange
through wave-particle interactions by selecting the range of the kinetic
energy and pitch angle of the electrons used in the computation of
Wint. The statistical significance of the obtained
Wint is evaluated by calculating the standard deviation
σW of Wint. In the results of the analysis, positive
or negative Wint is obtained at the different regions of
velocity phase space, while at the specific regions the obtained
Wint values are significantly greater than σW,
indicating efficient wave-particle interactions. The present study
demonstrates the feasibility of using the WPIA, which will be on board the
upcoming ERG satellite, for direct measurement of wave-particle interactions. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|