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Penetration of magnetosonic waves into the plasmasphere observed by the Van Allen Probes

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2015GL065745· OSTI ID:1402599
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [4];  [5]
  1. Changsha Univ. of Science and Technology, Changsha (China). School of Physics and Electronic Sciences
  2. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
  3. Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Aerospace Corporation, Los Angeles, CA (United States)

During the small storm on 14–15 April 2014, Van Allen Probe A measured a continuously distinct proton ring distribution and enhanced magnetosonic (MS) waves along its orbit outside the plasmapause. Inside the plasmasphere, strong MS waves were still present but the distinct proton ring distribution was falling steeply with distance. We adopt a sum of subtracted bi-Maxwellian components to model the observed proton ring distribution and simulate the wave trajectory and growth. MS waves at first propagate toward lower L shells outside the plasmasphere, with rapidly increasing path gains related to the continuous proton ring distribution. The waves then gradually cross the plasmapause into the deep plasmasphere, with almost unchanged path gains due to the falling proton ring distribution and higher ambient density. These results present the first report on how MS waves penetrate into the plasmasphere with the aid of the continuous proton ring distributions during weak geomagnetic activities.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautic and Space Administration (NASA); National Natural Science Foundation of China (NNSFC); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1402599
Report Number(s):
LA-UR--15-28235
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 18 Vol. 42; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Resonant Scattering of Radiation Belt Electrons by Off‐Equatorial Magnetosonic Waves journal February 2018
The Effect of Hot Protons on Magnetosonic Waves Inside and Outside the Plasmapause: New Observations and Theoretic Results journal January 2018
Fast Magnetosonic Waves Observed by Van Allen Probes: Testing Local Wave Excitation Mechanism journal January 2018
Equatorial Noise With Quasiperiodic Modulation: Multipoint Observations by the Van Allen Probes Spacecraft journal June 2018
EMIC Waves Converted From Equatorial Noise Due to M / Q = 2 Ions in the Plasmasphere: Observations From Van Allen Probes and Arase journal June 2019
Characteristics and Generation of Low‐Frequency Magnetosonic Waves Below the Proton Gyrofrequency journal November 2019
Wave Normal Angle Distribution of Fast Magnetosonic Waves: A Survey of Van Allen Probes EMFISIS Observations journal July 2019
Equatorial Propagation of the Magnetosonic Mode Across the Plasmapause: 2‐D PIC Simulations journal June 2019
Obliquely propagating magnetosonic waves in a plasma modeled by bi-anisotropic Cairns distribution journal August 2018

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