Bandwidths and amplitudes of chorus‐like banded emissions measured by the TC‐1 Double Star spacecraft
TLDR
In this paper, the authors derived the characteristics of banded whistler-mode emissions from a database of chorus-like events obtained from the complete data set of the wave measurements provided by the Spatio-TemporalAnalysis of Field Fluctuation-Digital Wave Processing (STAFF-DWP) wave instrument on board the Double Star spacecraft.Abstract:
Characteristics of banded whistler-mode emissions are derived from a database of chorus-like
events obtained from the complete data set of the wave measurements provided by the Spatio-Temporal
Analysis of Field Fluctuation-Digital Wave Processing (STAFF-DWP) wave instrument on board the TC-1
Double Star spacecraft. Our study covers the full operational period of this spacecraft (almost 4 years). Our
entire data set has been collected within 30◦ of geomagnetic latitude at L shells between 2 and 12 and
below 4 kHz. All events have been processed automatically to accurately determine their power spectral
density (PSD), bandwidth, and amplitude. We found most cases of chorus-like banded emissions at L≤10 on
the dawnside and dayside. The upper band emissions (above one half of the equatorial electron cyclotron
frequency) occur almost 20 times less often than the lower band, and their average amplitude is almost
3 times smaller than for the lower band. Intense upper band emissions cover smaller L shell, magnetic local
time (MLT), and magnetic latitudes regions than intense lower band emissions. The intense nightside and
dawnside chorus-like banded emissions were observed at low magnetic latitudes, while the intense dayside
and duskside emissions were mostly found at higher magnetic latitudes. The amplitudes of dayside lower
band waves slightly increase as they propagate away from the geomagnetic equator and are smaller than
chorus amplitudes on nightside and dawnside. The PSD, the amplitude of the lower band, its frequency
bandwidth, and its occurrence rate significantly increase with increasing geomagnetic activity, while all
these parameters for the upper band are not so strongly dependent on the geomagnetic activity.read more
Citations
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New chorus wave properties near the equator from Van Allen Probes wave observations
Wen Li,Ondrej Santolik,Jacob Bortnik,Richard M. Thorne,Craig Kletzing,William S. Kurth,George Hospodarsky +6 more
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Relation between Fine Structure of Energy Spectra for Pulsating Aurora Electrons and Frequency Spectra of Whistler Mode Chorus Waves
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TL;DR: In this article, the authors investigate the origin of the fine structure of the energy spectrum of precipitating electrons for the pulsating aurora (PsA) observed by the low-altitude Reimei satellite.
Journal ArticleDOI
Examining Coherency Scales, Substructure, and Propagation of Whistler Mode Chorus Elements With Magnetospheric Multiscale (MMS)
Drew Turner,Justin H. Lee,Seth G. Claudepierre,J. F. Fennell,J. B. Blake,Allison Jaynes,T. W. Leonard,Frederick Wilder,Robert E. Ergun,Daniel N. Baker,Ian J. Cohen,Barry Mauk,Robert J. Strangeway,David Hartley,Craig Kletzing,Hugo Breuillard,O. Le Contel,Yuri V. Khotyaintsev,Roy B. Torbert,Roy B. Torbert,Robert Allen,James L. Burch,Ondrej Santolik,Ondrej Santolik +23 more
TL;DR: In this article, a case study was examined from a period of substorm activity around the time of a conjunction between the MMS constellation and NASA's Van Allen Probes mission on 07 April 2016.
Journal ArticleDOI
Dependence of Generation of Whistler Mode Chorus Emissions on the Temperature Anisotropy and Density of Energetic Electrons in the Earth's Inner Magnetosphere
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Poynting Vector and Wave Vector Directions of Equatorial Chorus
Ulrich Taubenschuss,Ondřej Santolík,Ondřej Santolík,Hugo Breuillard,Wen Li,Wen Li,Olivier Le Contel +6 more
TL;DR: In this article, the authors present new results on wave vectors and Poynting vectors of chorus rising and falling tones on the basis of 6 years of THEMIS (Time History of Events and Macroscale Interactions during Substorms) observations.
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