Wire Probe Antenna (WPT) and Electric Field Detector (EFD) of Plasma Wave Experiment (PWE) aboard the Arase satellite: specifications and initial evaluation results

Kasaba, Yasumasa; Ishisaka, Keigo; Kasahara, Yoshiya; Imachi, Tomohiko; Yagitani, Satoshi; Kojima, Hirotsugu; Matsuda, Shoya; Motomizu, Shoji; Kurita, Satoshi; Hori, Tomoaki; Shinbori, Atsuki; Teramoto, Masaaki; Miyoshi, Yoshizumi; Nakagawa, Tomoko; Takahashi, Naoko; Nishimura, Y.; Matsuoka, A.; Kumamoto, A.; Tsuchiya, F.; Nomura, Reiko

doi:10.1186/s40623-017-0760-x

Cited by 54 publications

(63 citation statements)

References 21 publications

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“…The relationships suggested in the present study should be examined by comparing with other in situ observations, such as those from the Arase satellite in the Exploration of energization and Radiation in Geospace (ERG) project (Miyoshi et al, ), which has orbits in a relatively inner portion of the magnetosphere than the THEMIS probes. The Arase satellite is capable to observe chorus elements (Kasaba et al, ; Kasahara et al, ; Matsuda et al, ), the number density of cold plasma derived from both the upper hybrid resonance frequency (Kumamoto et al, ) and the local magnetic field intensity (Matsuoka et al, ), energetic electrons that provide free energy to chorus generating (Kasahara et al, ; Kazama et al, ), and energy exchanges between waves and particles (Hikishima et al, ; Katoh et al, ). A comprehensive study in Arase's data in the future will help us find important clues in understanding the characteristics of chorus elements revealed by the present study.…”

Section: Discussion and Summarymentioning

confidence: 99%

A Systematic Study in Characteristics of Lower Band Rising‐Tone Chorus Elements

et al. 2019

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Chorus waves are usually generated outside the plasmapause in the equatorial region of the magnetosphere. The discrete characteristics of chorus elements are quantified by the three parameters: lasting time, frequency bandwidth, and repetition period. A systematic study in the lasting time and frequency bandwidth in terms of background plasma and magnetic fields has not been performed in the past. Here we use burst mode waveform data from the Time History of Events and Macroscale Interaction during Substorms (THEMIS) probes and the random forest method of machine learning and Pearson's correlation analysis to investigate which background plasma and magnetic field parameter is dominant over the lasting time and frequency bandwidth. We find that the temperature is the most important parameter that controls the lasting time. The lasting time is shorter when this temperature is higher. We also find that the normalized bandwidth by the local electron cyclotron frequency is controlled by the number density of energetic electrons. The normalized bandwidth is wider when this number density is larger. These results can be well explained by the threshold and optimum wave amplitudes for the nonlinear generation of chorus waves (Omura & Nunn, 2011, https://doi.org/10.1029/2010JA016280). The findings derived from this analysis can be used to serve as a guideline for a deep understanding of the generation mechanism of chorus elements and help choose input for a modeling of wave‐particle interactions in the radiation belts.

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Section: Discussion and Summarymentioning

confidence: 99%

A Systematic Study in Characteristics of Lower Band Rising‐Tone Chorus Elements

et al. 2019

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“…The Arase (ERG) spacecraft (Miyoshi et al, ) was launched in December 2016 by ISAS/JAXA. The Arase satellite payload includes the electric field detector (EFD; Kasaba et al, ) which is a subcomponent of the Plasma Wave Experiment (PWE; Kasahara et al, ) and the fluxgate magnetometer (MGF) (Matsuoka et al, ). These instruments observe low frequency fluctuations of the electromagnetic field using wire‐probe antennas in the spin plane and MGFs in three directions (two in the spin plane and one in the spin axis).…”

Section: Dynamic Spectra Of Nonlinear Emic Emissionsmentioning

confidence: 99%

Instantaneous Frequency Analysis on Nonlinear EMIC Emissions: Arase Observation

Motomizu

Miyoshi

Omura

et al. 2018

Geophysical Research Letters

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In the inner magnetosphere, the Arase spacecraft has observed electromagnetic ion cyclotron (EMIC) emissions with both rising and falling frequencies. The instantaneous frequency analyses on the electromagnetic fields of the EMIC rising tone emission have been performed by the Hilbert‐Huang transform. The time variation of the instantaneous frequency shows a good agreement with the nonlinear theory for the frequency evolutions. Rapid instantaneous frequency modulation is also found during the rising tone emission. We estimate the peak‐to‐peak time of the fluctuation in the frequency and find that the fluctuation is caused around a half of the particle trapping time. From the motion of the phase‐bunched particle around the resonant velocity, it is expected that the nonlinear resonant current, which induces the falling frequency is formed in half the trapping time.

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“…Here we present magnetospheric in situ observations by ERG to demonstrate that electron strong diffusion is commonly observed in the midnight to dawnside equatorial region. In addition to the energetic electron data from MEP‐e (S. Kasahara, Yokota, et al, ), we use the in situ wave data obtained by the PWE/OFA instrument (Kasaba et al, ; Y. Kasahara, Kasaba, et al, ; Matsuda et al, ; Ozaki et al, ), the electron density data from PWE/HFA (Kumamoto et al, ), and the magnetic field data from MGF (Matsuoka et al, ).…”

Section: Introductionmentioning

confidence: 99%

Strong Diffusion of Energetic Electrons by Equatorial Chorus Waves in the Midnight‐to‐Dawn Sector

Kasahara

Miyoshi

Kurita

et al. 2019

Geophysical Research Letters

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Drastic variations of radiation‐belt/ring current electrons are the result of competing processes of acceleration, transport, and loss. For subrelativistic energetic electrons (10–100 keV), one of the promising loss mechanisms is precipitation into the atmosphere due to pitch angle scattering by whistler mode chorus waves. The efficiency of the scattering has yet to be quantified by direct observations, however. Using in situ measurements by the ERG (Arase) spacecraft in the midnight‐to‐dawn sector at and around the magnetic equator, we demonstrate that the full filling of energetic electron loss cones occurs commonly, associated with typical‐amplitude (greater than 50 pT) chorus waves. The spatial distribution of the loss cone filling indicates that the efficient scattering is limited to |MLAT|< 10°.

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Wire Probe Antenna (WPT) and Electric Field Detector (EFD) of Plasma Wave Experiment (PWE) aboard the Arase satellite: specifications and initial evaluation results

Cited by 54 publications

References 21 publications

A Systematic Study in Characteristics of Lower Band Rising‐Tone Chorus Elements

A Systematic Study in Characteristics of Lower Band Rising‐Tone Chorus Elements

Instantaneous Frequency Analysis on Nonlinear EMIC Emissions: Arase Observation

Strong Diffusion of Energetic Electrons by Equatorial Chorus Waves in the Midnight‐to‐Dawn Sector

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