EMIC wave spatial and coherence scales as determined from multipoint Van Allen Probe measurements

L. W. Blum, O. Agapitov, J. W. Bonnell, C. Kletzing, J. Wygant

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Electromagnetic ion cyclotron (EMIC) waves can provide a strong source of energetic electron pitch angle scattering. These waves are often quite localized, thus their spatial extent can have a large effect on their overall scattering efficiency. Using measurements from the dual Van Allen Probes, we examine four EMIC wave events observed simultaneously on the two probes at varying spacecraft separations. Correlation of both the wave amplitude and phase observed at both spacecraft is examined to estimate the active region and coherence scales of the waves. We find well-correlated wave amplitude and amplitude modulation across distances spanning hundreds to thousands of kilometers. Phase coherence persisting 30–60 s is observable during close conjunction events but is lost as spacecraft separations exceed ~1 Earth Radii.

Original languageEnglish (US)
Pages (from-to)4799-4807
Number of pages9
JournalGeophysical Research Letters
Volume43
Issue number10
DOIs
StatePublished - 2016

Bibliographical note

Publisher Copyright:
©2016. American Geophysical Union. All Rights Reserved.

Keywords

  • EMIC waves
  • coherence scales
  • multipoint measurements

Fingerprint

Dive into the research topics of 'EMIC wave spatial and coherence scales as determined from multipoint Van Allen Probe measurements'. Together they form a unique fingerprint.

Cite this