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Excitation of O+ Band EMIC Waves Through H+ Ring Velocity Distributions: Van Allen Probe Observations

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2018GL077109· OSTI ID:1542833
 [1];  [1];  [1];  [1];  [2];  [3];  [4]
  1. Wuhan Univ., Wuhan (China)
  2. GFZ German Research Center for Geosciences, Potsdam (Germany)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Minnesota, Minneapolis, MN (United States)
+ Show Author Affiliations
A typical case of electromagnetic ion cyclotron (EMIC) emissions with both He+ band and O+ band waves was observed by Van Allen Probe A on 14 July 2014. These emissions occurred in the morning sector on the equator inside the plasmasphere, in which region O+ band EMIC waves prefer to appear. Through property analysis of these emissions, it is found that the He+ band EMIC waves are linearly polarized and propagating quasi–parallelly along the background magnetic field, while the O+ band ones are of linear and left–hand polarization and propagating obliquely with respect to the background magnetic field. Using the in situ observations of plasma environment and particle data, excitation of these O+ band EMIC waves has been investigated with the linear growth theory. The calculated linear growth rate shows that these O+ band EMIC waves can be locally excited by ring current protons with ring velocity distributions. The comparison of the observed wave spectral intensity and the calculated growth rate suggests that the density of H+ rings providing the free energy for the instability has decreased after the wave grows. Furthermore, this paper provides a direct observational evidence to the excitation mechanism of O+ band EMIC waves: ring current protons with ring distributions provide the free energy supporting the instability in the presence of rich O+ in the plasmasphere.
Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
NASA; USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1542833
Report Number(s):
LA-UR--18-26636
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 3 Vol. 45; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Response of Banded Whistler Mode Waves to the Enhancement of Solar Wind Dynamic Pressure in the Inner Earth's Magnetosphere journal September 2018
Simultaneous Trapping of Electromagnetic Ion Cyclotron and Magnetosonic Waves by Background Plasmas journal March 2019
Saturation Characteristics of Parallel EMIC Waves in the Inner Magnetosphere journal July 2019
Analyzing EMIC Waves in the Inner Magnetosphere Using Long‐Term Van Allen Probes Observations journal September 2019
Propagation of EMIC Waves Inside the Plasmasphere: A Two‐Event Study journal November 2019

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
O+ band EMIC waves
linear wave growth
ring distributions