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Title: Hiss or equatorial noise? Ambiguities in analyzing suprathermal ion plasma wave resonance

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1002/2016JA022975· OSTI ID:1503185
ORCiD logo [1]; ORCiD logo [1];  [2];  [3]; ORCiD logo [2];  [4];  [2]; ORCiD logo [2];  [4];  [5];  [5];  [1];  [6];  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Climate and Space Sciences and Engineering
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Czech Academy of Sciences, Prague (Czech Republic). Inst. of Atmospheric Physics. Dept. of Space Physics; Charles Univ., Prague (Czech Republic). Faculty of Mathematics and Physics
  4. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
  5. Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
  6. Eastern Michigan Univ., Ypsilanti, MI (United States). Dept. of Mathematics
+ Show Author Affiliations

Previous studies have shown that low-energy ion heating occurs in the magnetosphere due to strong equatorial noise emission. Observations from the Van Allen Probes Helium Oxygen Proton Electron (HOPE) instrument recently determined that there was a depletion in the 1–10 eV ion population in the postmidnight sector of Earth during quiet times at L < 3. The diurnal variation of equatorially mirroring 1–10 eV H+ ions at 2 < L < 3 is connected with similar diurnal variation in the electric field component of plasma waves ranging between 150 and 600 Hz. Measurements from the Van Allen Probes Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) data set are used here to analyze waves of this frequency in near-Earth space. However, when we examine the polarization of the waves in the 150 to 600 Hz range in the equatorial plane, the majority are right-hand polarized plasmaspheric hiss waves. The 1–10 eV H+ equatorially mirroring population does not interact with right-hand waves, despite a strong statistical relationship suggesting that the two are linked. We present evidence supporting the relationship, both in our own work and the literature, but we ultimately conclude that the 1–10 eV H+ heating is not related to the strong enhancement of 150 to 600 Hz waves.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Univ. of Michigan, Ann Arbor, MI (United States); Univ. of Iowa, Iowa City, IA (United States); Czech Academy of Sciences, Prague (Czech Republic)
Sponsoring Organization:
USDOE; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); Czech Academy of Sciences (Czech Republic)
Grant/Contract Number:
89233218CNA000001; NWX11AO60G; NWX144AC02G; NNG07EK09I; 921647; AGS-1265651; AGS-1102863; LH14010; LH15304
OSTI ID:
1503185
Report Number(s):
LA-UR-16-25767
Journal Information:
Journal of Geophysical Research. Space Physics, Vol. 121, Issue 10; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

References (54)

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
79 ASTRONOMY AND ASTROPHYSICS
plasmasphere
equatorial noise
plasma waves
plasmaspheric hiss
low-energy ions