Plasma wave observation and sounder experiments(PWS) using the Akebono (EXOS-D) satellite. Instrumentation and initial results including discovery of the high altitude equatorial plasma turbulence.

Oya, Hiroshi; Morioka, A.; Kobayashi, K.; Iizima, M.; Ono, Takayuki; Miyaoka, Hiroshi; Okada, T.; Obara, Takao

doi:10.5636/jgg.42.411

Cited by 100 publications

(70 citation statements)

References 40 publications

(33 reference statements)

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“…Hot electron data were derived from NOAA/POES satellite observations [Evans and Greer, 2000]. Thermal plasma densities were derived from the frequency of the upper-hybrid resonance waves measured by the Plasma Wave observation and Sounder experiments instrument of the Akebono satellite [Oya et al, 1990]. The data for whistler mode waves were obtained by the VLF instrument of the Akebono satellite [Kimura et al, 1990].…”

Section: Discussionmentioning

confidence: 99%

High‐speed solar wind with southward interplanetary magnetic field causes relativistic electron flux enhancement of the outer radiation belt via enhanced condition of whistler waves

Miyoshi

Kataoka

Kasahara

et al. 2013

Geophysical Research Letters

132

163

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Relativistic electron flux in the outer radiation belt tends to increase during the high‐speed solar wind stream (HSS) events. However, HSS events do not always cause large flux enhancement. To determine the HSS events that cause such enhancement and the mechanisms that are responsible for accelerating the electrons, we analyzed long‐term plasma data sets, for periods longer than one solar cycle. We demonstrate that during HSS events with the southward interplanetary magnetic field (IMF)‐dominant HSS (SBz‐HSS), relativistic electrons are accelerated by whistler mode waves; however, during HSS events with the northward IMF‐dominant HSS, this acceleration mechanism is not effective. The differences in the responses of the outer radiation belt flux variations are caused by the differences in the whistler mode wave–electron interactions associated with a series of substorms. During SBz‐HSS events, hot electron injections occur and the thermal plasma density decreases due to the shrinkage of the plasmapause, causing large flux enhancement of relativistic electrons through whistler mode wave excitation. These results explain why large flux enhancement of relativistic electrons tends to occur during SBz‐HSS events.

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Section: Discussionmentioning

confidence: 99%

High‐speed solar wind with southward interplanetary magnetic field causes relativistic electron flux enhancement of the outer radiation belt via enhanced condition of whistler waves

Miyoshi

Kataoka

Kasahara

et al. 2013

Geophysical Research Letters

132

163

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“…The impedance probe instrument was originally developed by Oya (1966) and installed in various sounding rockets and satellites because of its exclusively high performance for the plasma density measurement in space (e.g. Oya and Obayashi, 1966, Oya et al, 1975, 1990Yamamoto et al, 1998).…”

Section: Instrumentmentioning

confidence: 99%

Electron density and plasma waves in mid-latitude sporadic-<i>E</i> layer observed during the SEEK-2 campaign

et al. 2005

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Abstract. The SEEK-2 campaign was carried out over Kyushu Island in Japan on 3 August 2002, by using the two sounding rockets of S310-31 and S310-32. This campaign was planned to elucidate generation mechanisms of Quasi-Periodic Echoes (QPEs) associated with mid-latitude sporadic-E(E s ) layers. Electron number densities were successfully measured in the E s layers by using the impedance probe on board two rockets. The plasma waves in the VLF and ELF ranges were also observed on board the S310-32 rocket. Results of electron density measurement showed that there were one or two major peaks in the E s layers along the rockets' trajectories near the altitude of about 100 km. There were some smaller peaks associated with the main E s layers in the altitude range from 90 to 120 km. These density peaks were distributed in a very large extent during the SEEK-2 campaign. The E s layer structure is also measured by using the Fixed Bias Probe (FBP), which has a high spatial resolution of several meters (the impedance probe has an altitude resolution of about 400 m). The comparison with the total electron content (TEC) measured by the Dual Band Beacon revealed that the E s layer was also modulated in the horizontal direction with the scale size of 30-40 km. It was shown that the QP echoes observed by the ground-based coherent radar come from the major density peak of the E s layer. The plasma wave instrument detected the enhancement of VLF and ELF plasma waves associated with the operation of the TMA release, and also with the passage of the E s layers.

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“…The Plasma Wave and Sounder Experiment (PWS) onboard the Akebono satellite detects electric fields in the frequency range from 20 kHz to 5.12 MHz (Oya et al, 1990). The Very Low Frequency Plasma Wave Detector (VLF) detects electric and magnetic fields in the frequency range from 3.16 Hz to 17.8 kHz (Kimura et al, 1990).…”

Section: Observationsmentioning

confidence: 99%

Storm-time electron flux precipitation in the inner radiation belt caused by wave-particle interactions

et al. 2009

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Abstract. It has been believed that electrons in the inner belt do not show the dynamical variation during magnetic storms except for great magnetic storms. However, Tadokoro et al. (2007) recently disclosed that low-altitude electrons in the inner belt frequently show flux variations during storms (Storm Time inner belt Electron Enhancement at the Low altitude (STEEL)). This paper investigates a possible mechanism explaining STEEL during small and moderate storms, and shows that it is caused not by radial transport processes but by pitch angle scattering through wave-particle interactions. The waves related to wave-particle interactions are attributed to be banded whistler mode waves around 30 kHz observed in the inner magnetosphere by the Akebono satellite. The estimated pitch angle distribution based on a numerical calculation is roughly consistent with the observed results.

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Plasma wave observation and sounder experiments(PWS) using the Akebono (EXOS-D) satellite. Instrumentation and initial results including discovery of the high altitude equatorial plasma turbulence.

Cited by 100 publications

References 40 publications

High‐speed solar wind with southward interplanetary magnetic field causes relativistic electron flux enhancement of the outer radiation belt via enhanced condition of whistler waves

High‐speed solar wind with southward interplanetary magnetic field causes relativistic electron flux enhancement of the outer radiation belt via enhanced condition of whistler waves

Electron density and plasma waves in mid-latitude sporadic-<i>E</i> layer observed during the SEEK-2 campaign

Storm-time electron flux precipitation in the inner radiation belt caused by wave-particle interactions

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Plasma wave observation and sounder experiments(PWS) using the Akebono (EXOS-D) satellite. Instrumentation and initial results including discovery of the high altitude equatorial plasma turbulence.

Cited by 100 publications

References 40 publications

High‐speed solar wind with southward interplanetary magnetic field causes relativistic electron flux enhancement of the outer radiation belt via enhanced condition of whistler waves

High‐speed solar wind with southward interplanetary magnetic field causes relativistic electron flux enhancement of the outer radiation belt via enhanced condition of whistler waves

Electron density and plasma waves in mid-latitude sporadic-&lt;i&gt;E&lt;/i&gt; layer observed during the SEEK-2 campaign

Storm-time electron flux precipitation in the inner radiation belt caused by wave-particle interactions

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Electron density and plasma waves in mid-latitude sporadic-<i>E</i> layer observed during the SEEK-2 campaign