Geospace exploration project: Arase (ERG)

Miyoshi, Yoshizumi; Kasaba, Yasumasa; Shinohara, I.; Takashima, Takeshi; Asamura, Kazushi; Matsumoto, Haruhisa; Higashio, Nana; Mitani, Takefumi; Kasahara, Satoshi; Yokota, Shoichiro; Wang, Shiang‐Yu; Kazama, Y.; Kasahara, Yoshiya; Yagitani, Satoshi; Matsuoka, A.; Kojima, Hirotsugu; Katoh, Yutai; Shiokawa, K; Seki, K.; Fujimoto, M.; Ono, Takayuki

doi:10.1088/1742-6596/869/1/012095

Cited by 36 publications

(46 citation statements)

References 3 publications

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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, ).…”

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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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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“…Both measurements were available for a range of primates -and, as predicted, a positive relationship was found between these factors. Multiple teams replicated the finding, using a range of related variables -for example, measuring the relative sizes of the neocortex region rather than overall brain size -for primates 7 and other taxa 8 . Yet, as Ashton and colleagues acknowledge, analyses of large databases often provide conflicting results.…”

Section: O Bservations Of Primates' Everyday Lives Led the Psychologimentioning

confidence: 89%

“…When these particles interact with electromagnetic waves called chorus waves, which are generated in the equatorial region of the magnetosphere, they can be directed towards Earth's atmosphere, where they produce auroral light. The authors detected the interactions between the chorus waves and the electrons using the Arase spacecraft 8 , which was positioned on the relevant field line.…”

mentioning

confidence: 99%

The origin of pulsating auroras

Jaynes¹

2018

Nature

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“…The primary objective of the Arase mission is to reveal the generation mechanisms of relativistic electrons in radiation belts Miyoshi et al 2017). Particles of various energies and waves of various frequencies are considered to be involved in the electron acceleration process in the inner magnetosphere.…”

Section: Introductionmentioning

confidence: 99%

The ARASE (ERG) magnetic field investigation

Matsuoka

Teramoto

Nomura

et al. 2018

Earth Planets Space

139

156

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The fluxgate magnetometer for the Arase (ERG) spacecraft mission was built to investigate particle acceleration processes in the inner magnetosphere. Precise measurements of the field intensity and direction are essential in studying the motion of particles, the properties of waves interacting with the particles, and magnetic field variations induced by electric currents. By observing temporal field variations, we will more deeply understand magnetohydrodynamic and electromagnetic ion-cyclotron waves in the ultra-low-frequency range, which can cause production and loss of relativistic electrons and ring-current particles. The hardware and software designs of the Magnetic Field Experiment (MGF) were optimized to meet the requirements for studying these phenomena. The MGF makes measurements at a sampling rate of 256 vectors/s, and the data are averaged onboard to fit the telemetry budget. The magnetometer switches the dynamic range between ± 8000 and ± 60,000 nT, depending on the local magnetic field intensity. The experiment is calibrated by preflight tests and through analysis of in-orbit data. MGF data are edited into files with a common data file format, archived on a data server, and made available to the science community. Magnetic field observation by the MGF will significantly improve our knowledge of the growth and decay of radiation belts and ring currents, as well as the dynamics of geospace storms.

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Geospace exploration project: Arase (ERG)

Cited by 36 publications

References 3 publications

Instantaneous Frequency Analysis on Nonlinear EMIC Emissions: Arase Observation

Instantaneous Frequency Analysis on Nonlinear EMIC Emissions: Arase Observation

The origin of pulsating auroras

The ARASE (ERG) magnetic field investigation

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