scholarly journals A novel technique to construct the global distribution of whistler mode chorus wave intensity using low-altitude POES electron data

2014 ◽  
Vol 119 (7) ◽  
pp. 5685-5699 ◽  
Author(s):  
Binbin Ni ◽  
Wen Li ◽  
Richard M. Thorne ◽  
Jacob Bortnik ◽  
Janet C. Green ◽  
...  
Keyword(s):  
Wave Intensity ◽  
Global Distribution ◽  
Whistler Mode ◽  
Novel Technique ◽  
Low Altitude ◽  
Chorus Wave

Global Morphology of Lower-band Chorus Wave Intensity Reconstructed Using multi-year POES Electron Measurements

2020 ◽  
Author(s):  
Yang Zhang ◽  
Binbin Ni ◽  
Xudong Gu ◽  
Yuri Shprits ◽  
Song Fu ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Wave Intensity ◽  
Global Distribution ◽  
Loss Cone ◽  
Wave Measurements ◽  
Lower Band ◽  
Chorus Waves ◽  
Radiation Belt Electrons ◽  
Chorus Wave

<p><span>Magnetospheric chorus is known to play a significant role in the acceleration and loss of radiation belt electrons. Interactions of chorus waves with radiation belt particles are commonly evaluated using quasi-linear diffusion codes that rely on statistical models, which might not accurately provide the instantaneous global wave distribution from limited in-situ wave measurements. Thus, a novel technique capable of inferring wave amplitudes from POES particle measurements, with an extensive coverage of L-shell and magnetic local time, has been established to obtain event-specific, global dynamic evolutions of chorus waves. This study, using 5 years of POES electron data, further improves the technique, and enables us to subsequently infer the chorus wave amplitudes for all useful data points (removing the electrons which were in the drift loss cone) and to construct the global distribution of lower-band chorus wave intensity. The results obtained from the improved technique reproduce Van Allen Probes in-situ observations of chorus waves reasonably well and reconstruct the major features of the global distribution of chorus waves. We demonstrate that such a data-based, dynamic model can provide near-real-time estimates of chorus wave intensity on a global scale for any time period when POES data are available, which cannot be obtained from in-situ wave measurements by equatorial satellites alone, but is crucial for quantifying the  dynamics of the radiation belt electrons.</span></p>

On the upper frequency limit of whistler mode waves observed by low-altitude spacecraft

2020 ◽  
Author(s):  
Frantisek Nemec ◽  
Ondřej Santolík ◽  
Michel Parrot
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Waves ◽  
Low Frequency ◽  
Realistic Model ◽  
Wave Intensity ◽  
Frequency Limit ◽  
Whistler Mode ◽  
The Earth ◽  
Whistler Mode Waves ◽  
Low Altitude

<p>Frequency-latitude plots of electromagnetic wave intensity in the very low frequency range (VLF, up to about 20 kHz) observed by the low altitude DEMETER spacecraft are analyzed. Apart from electromagnetic waves generated by plasma instabilities in the magnetosphere, a significant portion of the detected wave intensity comes from ground-based lightning activity and VLF military transmitters. These whistler mode waves are observed not only close to source locations, but also close to their geomagnetically conjugated points. There appears to be an upper frequency limit of such emissions, where the wave intensity substantially decreases. Its frequency roughly corresponds to half of the equatorial electron cyclotron frequency at a respective magnetic field line, suggesting a relation to wave ducting in ducts with enhanced density. However, it seems to exhibit a non-negligible longitudinal dependence and it is different during the day than during the night. We use a realistic model of the Earth’s magnetic field to explain the observed variations. We interpret the observations in terms of ducted/unducted wave propagation, and we compare the wave intensities in the source hemisphere with those measured in the hemisphere geomagnetically conjugated.</p>

scholarly journals Constructing the global distribution of chorus wave intensity using measurements of electrons by the POES satellites and waves by the Van Allen Probes

2013 ◽  
Vol 40 (17) ◽  
pp. 4526-4532 ◽  
Author(s):  
W. Li ◽  
B. Ni ◽  
R. M. Thorne ◽  
J. Bortnik ◽  
J. C. Green ◽  
...  
Keyword(s):  
Wave Intensity ◽  
Global Distribution ◽  
Van Allen Probes ◽  
Chorus Wave

scholarly journals Testing the Organization of Whistler-mode Chorus Wave Properties by Plasmapause Location

2020 ◽  
Author(s):  
David M. Malaspina ◽  
Allison N Jaynes ◽  
Scot R. Elkington ◽  
Anthony Arthur Chan ◽  
George Blair Hospodarsky ◽  
...  
Keyword(s):  
Whistler Mode ◽  
Wave Properties ◽  
Chorus Wave

scholarly journals A prediction model for the global distribution of whistler chorus wave amplitude developed separately for two latitudinal zones

2015 ◽  
Vol 120 (4) ◽  
pp. 2819-2837 ◽  
Author(s):  
Jin-Hee Kim ◽  
Dae-Young Lee ◽  
Jung-Hee Cho ◽  
Dae-Kyu Shin ◽  
Kyung-Chan Kim ◽  
...  
Keyword(s):  
Prediction Model ◽  
Wave Amplitude ◽  
Global Distribution ◽  
Chorus Wave

Global distribution of whistler-mode chorus waves observed on the THEMIS spacecraft

2009 ◽  
Vol 36 (9) ◽  
Author(s):  
W. Li ◽  
R. M. Thorne ◽  
V. Angelopoulos ◽  
J. Bortnik ◽  
C. M. Cully ◽  
...  
Keyword(s):  
Global Distribution ◽  
Whistler Mode ◽  
Chorus Waves

scholarly journals Testing the Organization of Lower‐Band Whistler‐Mode Chorus Wave Properties by Plasmapause Location

2020 ◽  
Vol 126 (1) ◽  
Author(s):  
David M. Malaspina ◽  
Allison N. Jaynes ◽  
Scot Elkington ◽  
Anthony Chan ◽  
George Hospodarsky ◽  
...  
Keyword(s):  
Whistler Mode ◽  
Lower Band ◽  
Wave Properties ◽  
Chorus Wave
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