Cluster observations of EMIC triggered emissions in association with Pc1 waves near Earth's plasmapause

By J. Pickett, B. Grison, Yoshiharu Omura, M. Engebretson, I. Dandouras, Arnaud Masson, M. L. Adrian, O. Santolík, P. Décréau, N. Cornilleau-Wehrlin and 1 more. 2010

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The Cluster spacecraft were favorably positioned on the nightside near the equatorial plasmapause of Earth at L ∼ 4.3 on 30 March 2002 to observe electromagnetic ion cyclotron (EMIC) rising tone emissions in association with Pc1 waves at 1.5 Hz. The EMIC rising tone emissions were found to be left‐hand, circularly polarized, dispersive, and propagating away from the equator. Their burstiness and dispersion of ∼30s/Hz rising out of the 1.5 Hz Pc1 waves are consistent with their identification as EMIC triggered chorus emissions, the first to be reported through in situ observations near the plasmapause. Along with the expected H+ ring current ions seen at higher energies (>300 eV), lower energy ions (300 eV and less) were observed during the most intense EMIC triggered emission events. Nonlinear wave‐particle interactions via cyclotron resonance between the ∼2–10 keV H+ ions with temperature anisotropy and the linearly‐amplified Pc1 waves are suggested as a possible generation mechanism for the EMIC triggered emissions.

Subfields: Astronomy and Astrophysics, Geophysics

View Paper: https://www.semanticscholar.org/paper/db3c3c16b5a0200b29fe018a5066546d23ac5afe

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In Astronomy and Astrophysics

1. R. Thorne
2. Wen Li
3. R. Horne
4. Nigel P. Meredith
5. M. Hudson
6. Jacob Bortnik
7. Y. Shprits
8. Binbin Ni

In Geophysics

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2. Wen Li
3. Nigel P. Meredith
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5. M. Hudson
6. Y. Shprits
7. Jacob Bortnik
8. Binbin Ni

Citations in the corpus

• Earth's Van Allen Radiation Belts: From Discovery to the Van Allen Probes Era (2019, background): “As discussed in sections 3.1 and 3.2, magnetospheric waves, such as chorus and EMIC waves, often exhibit coherent, discrete structures (e.g., Pickett et al., 2010; Santolík et al., 2003), for which the quasilinear approach may not be valid.”
• The occurrence and wave properties of H+‐, He+‐, and O+‐band EMIC waves observed by the Van Allen Probes (2015, background): “…to the well-known enhanced EMIC wave occurrence region where ring current ions overlap with the plasmasphere and where dayside drainage plumes are known to occur [Morley et al., 2009; Pickett et al., 2010; Thorne, 2010] and has been reported before at higher L shells [Keika et al., 2013].”
• The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on RBSP (2013, background): “Favored regions for EMIC excitation include the overlap between the ring current and the plasmasphere (Pickett et al. 2010), dayside drainage plumes (Morley et al. 2009), and the outer dayside magnetosphere in association with solar wind pressure fluctuations (Arnoldy et al. 2005; Usanova et al.…”
• Global morphology and spectral properties of EMIC waves derived from CRRES observations (2014, background): “They are preferentially excited in regions of high density and hence are strongest in regions where the ring current overlaps the plasmasphere [e.g., Yahnina et al., 2003; Pickett et al., 2010] and dayside drainage plumes [Morley et al., 2009].”