Rocket Observation of Sub‐Relativistic Electrons in the Quiet Dayside Auroral Ionosphere

Namekawa, Taku; Mitani, Takefumi; Asamura, Kazushi; Miyoshi, Yoshizumi; Hosokawa, K.; Ogawa, Y.; Saito, Shinji; Hori, Tomoaki; Sugo, Shin; Kawashima, O.; Kasahara, Satoshi; Nomura, Reiko; Yagi, Naoshi; Fukizawa, Mizuki; Sakanoi, Takeshi; Saito, Yoshifumi; Matsuoka, A.; Shinohara, I.; Fedorenko, Yu. V.; Nikitenko, A. S.; Koehler, C.

doi:10.1029/2020ja028633

Cited by 2 publications

(2 citation statements)

References 69 publications

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“…The additional requirement of a conjugation of ground-based and equatorial observations with ELFIN low-altitude measurements of precipitations further reduces significantly the number of events. As a consequence, the results of the present study are based on only four events and should be considered (in addition to the results of recent simulations, see L. Chen et al, 2020Namekawa et al, 2021) as an observational indication of the possibly important role of whistler-mode wave ducting for relativistic electron precipitations.…”

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confidence: 64%

Role of Ducting in Relativistic Electron Loss by Whistler‐Mode Wave Scattering

et al. 2021

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confidence: 64%

Role of Ducting in Relativistic Electron Loss by Whistler‐Mode Wave Scattering

et al. 2021

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“…HEP is an improved version of the detector installed in a previous sounding rocket experiment (Namekawa et al., 2021). HEP consists of a mechanical collimator, eight‐layered silicon semiconductor detectors (SSDs), and an anti‐coincidence sensor used to remove the effects of cosmic rays.…”

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confidence: 99%

Simultaneous Precipitation of Sub‐Relativistic Electron Microburst and Pulsating Aurora Electrons

Namekawa,

Mitani,

Asamura

et al. 2023

Geophysical Research Letters

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We have identified for the first time an energy‐time dispersion of precipitating electron flux in a pulsating aurora patch, ranging from 6.7 to 580 keV, through simultaneous in‐situ observations of sub‐relativistic electrons of microburst precipitations and lower‐energy electrons using the Loss through Auroral Microburst Pulsation sounding rocket launched from the Poker Flat Research Range in Alaska. Our observations reveal that precipitating electrons with energies of 180–320 keV were observed first, followed by 250–580 keV electrons 0–30 ms later, and finally, after 500–1,000 ms, 6.7–14.6 keV electrons were observed. The identified energy‐time dispersion is consistent with the theoretical estimation that the relativistic electron microbursts are a high‐energy tail of pulsating aurora electrons, which are caused by chorus waves propagating along the field line.

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Rocket Observation of Sub‐Relativistic Electrons in the Quiet Dayside Auroral Ionosphere

Abstract: It is suggested that this phenomenon is related to the loss mechanism of the outer radiation belt electrons through physical processes such as pitch angle scattering due to magnetospheric whistler-mode waves (e.g.,

Cited by 2 publications

References 69 publications

Role of Ducting in Relativistic Electron Loss by Whistler‐Mode Wave Scattering

Role of Ducting in Relativistic Electron Loss by Whistler‐Mode Wave Scattering

Simultaneous Precipitation of Sub‐Relativistic Electron Microburst and Pulsating Aurora Electrons

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