The occurrence and wave properties of H⁺-, He⁺-, and O⁺-band EMIC waves observed by the Van Allen Probes

Saikin, A. A.; Zhang, J. -C.; Allen, R. C.; Smith, C. W.; Kistler, L. M.; Spence, H. E.; Torbert, R. B.; Kletzing, C. A.; Jordanova, Vania K.

doi:10.1002/2015JA021358

Title: The occurrence and wave properties of H⁺-, He⁺-, and O⁺-band EMIC waves observed by the Van Allen Probes

Journal Article · Sat Sep 26 00:00:00 EDT 2015 · Journal of Geophysical Research. Space Physics

DOI:https://doi.org/10.1002/2015JA021358· OSTI ID:1221606

Saikin, A. A. ^[1]; Zhang, J. -C. ^[1]; Allen, R. C. ^[2]; Smith, C. W. ^[1]; Kistler, L. M. ^[1]; Spence, H. E. ^[1]; Torbert, R. B. ^[1]; Kletzing, C. A. ^[3]; Jordanova, Vania K. ^[4]

Univ. of New Hampshire, Durham, NH (United States)
Univ. of Texas at San Antonio, TX (United States); Southwest Research Institute, San Antonio, TX (United States)
Univ. of Iowa, Iowa City, IA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We perform a statistical study of electromagnetic ion cyclotron (EMIC) waves detected by the Van Allen Probes mission to investigate the spatial distribution of their occurrence, wave power, ellipticity, and normal angle. The Van Allen Probes have been used which allow us to explore the inner magnetosphere (1.1 to 5.8 RE). Magnetic field measurements from the Electric and Magnetic Field Instrument Suite and Integrated Science on board the Van Allen Probes are used to identify EMIC wave events for the first 22 months of the mission operation (8 September 2012 to 30 June 2014). EMIC waves are examined in H⁺-, He⁺-, and O⁺-bands. Over 700 EMIC wave events have been identified over the three different wave bands (265 H⁺-band events, 438 He⁺-band events, and 68 O⁺-band events). EMIC wave events are observed between L = 2 – 8, with over 140 EMIC wave events observed below L = 4. The results show that H⁺-band EMIC waves have two peak magnetic local time (MLT) occurrence regions: pre-noon (09:00 < MLT ≤ 12:00) and afternoon (15:00 < MLT ≤ 17:00) sectors. He⁺-band EMIC waves feature an overall stronger dayside occurrence. O⁺-band EMIC waves have one peak region located in the morning sector at lower L shells (L < 4). He⁺-band EMIC waves average the highest wave power overall (>0.1 nT²/Hz), especially in the afternoon sector. Ellipticity observations reveal that linearly polarized EMIC waves dominate in lower L shells.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1221606

Report Number(s):: LA-UR-15-23068

Journal Information:: Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 177 works

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58 GEOSCIENCES
EMIC waves
Van Allen Probes
Fast Fourier Transform
spatial distribution
band separation

Title: The occurrence and wave properties of H⁺-, He⁺-, and O⁺-band EMIC waves observed by the Van Allen Probes

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