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Comparing simulated and observed EMIC wave amplitudes using in situ Van Allen Probes’ measurements

Journal Article · · Journal of Atmospheric and Solar-Terrestrial Physics
 [1];  [2];  [1];  [1];  [1];  [3];  [3];  [1];  [4];  [5];  [6]
  1. Univ. of New Hampshire, Durham, NH (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); The New Mexico Consortium, Los Alamos, NM (United States)
  4. Univ. of Iowa, Iowa City, IA (United States)
  5. Univ. of California, Los Angeles, CA (United States)
  6. Univ. of California, Los Angeles, CA (United States) ; University of Potsdam (Germany)
+ Show Author Affiliations
In this study, we perform a statistical study calculating electromagnetic ion cyclotron (EMIC) wave amplitudes based off in situ plasma measurements taken by the Van Allen Probes’ (1.1–5.8 Re) Helium, Oxygen, Proton, Electron (HOPE) instrument. Calculated wave amplitudes are compared to EMIC waves observed by the Electric and Magnetic Field Instrument Suite and Integrated Science on board the Van Allen Probes during the same period. The survey covers a 22-month period (1 November 2012 to 31 August 2014), a full Van Allen Probe magnetic local time (MLT) precession. The linear theory proxy was used to identify EMIC wave events with plasma conditions favorable for EMIC wave excitation. Two hundred and thirty-two EMIC wave events (103 H+-band and 129 He+-band) were selected for this comparison. Nearly all events selected are observed beyond L = 4. Results show that calculated wave amplitudes exclusively using the in situ HOPE measurements produce amplitudes too low compared to the observed EMIC wave amplitudes. Hot proton anisotropy (Ahp) distributions are asymmetric in MLT within the inner (L < 7) magnetosphere with peak (minimum) Ahp, ~0.81 to 1.00 (~0.62), observed in the dawn (dusk), 0000 < MLT ≤ 1200 (1200 < MLT ≤ 2400), sectors. Measurements of Ahp are found to decrease in the presence of EMIC wave activity. Ahp amplification factors are determined and vary with respect to EMIC wave-band and MLT. Lastly, He+-band events generally require double (quadruple) the measured Ahp for the dawn (dusk) sector to reproduce the observed EMIC wave amplitudes.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
NASA; USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1422963
Alternate ID(s):
OSTI ID: 1702939
Report Number(s):
LA-UR--17-23552
Journal Information:
Journal of Atmospheric and Solar-Terrestrial Physics, Journal Name: Journal of Atmospheric and Solar-Terrestrial Physics Vol. 177; ISSN 1364-6826
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Test of Ion Cyclotron Resonance Instability Using Proton Distributions Obtained From Van Allen Probe-A Observations journal August 2018
EMIC Wave Properties Associated With and Without Injections in The Inner Magnetosphere journal March 2019
Storm Time EMIC Waves Observed by Swarm and Van Allen Probe Satellites journal January 2019

Figures / Tables (8)

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Table 1(p. 50)table Table 1

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Related Subjects

58 GEOSCIENCES
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
EMIC waves
Linear theory
Van Allen Probes
Wave generation