Transient ionization of the mesosphere during auroral breakup: Arase satellite and ground-based conjugate observations at Syowa Station

Kataoka, Ryuho; Nishiyama, Takanori; Tanaka, Yoshimasa; Kadokura, Akira; Uchida, Herbert Akihito; Ebihara, Yusuke; Ejiri, Mitsumu K.; Tomikawa, Yoshihiro; Tsutsumi, Masaki; Sato, K.; Miyoshi, Yoshizumi; Shiokawa, K.; Kurita, Satoshi; Kasahara, Yoshiya; Ozaki, Mitsunori; Hosokawa, K.; Matsuda, Shoya; Shinohara, I.; Takashima, Takeshi; Sato, Tatsuhiko; Mitani, Takefumi; Hori, Tomoaki; Higashio, Nana

doi:10.1186/s40623-019-0989-7

Cited by 9 publications

(11 citation statements)

References 52 publications

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“…Nishiyama et al () have shown some good examples of PMWE and CNA simultaneously observed in the daytime during substorms. Kataoka et al () reported that the mesosphere echoes were observed at 65–70 km during the premidnight auroral breakup in association with CNA in the ionosphere and broadband noise in the magnetosphere. In this study, it was deduced from the PMWE observed at 63–8 km that the energetic electrons with E up to 500 keV were precipitated during the substorm expansion phase.…”

Section: Discussionmentioning

confidence: 99%

Direct Comparison Between Magnetospheric Plasma Waves and Polar Mesosphere Winter Echoes in Both Hemispheres

et al. 2019

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We present the first and direct comparison between magnetospheric plasma waves and polar mesosphere winter echoes (PMWE) simultaneously observed by the conjugate observation with Arase satellite and high-power atmospheric radars in both hemispheres, namely, the Program of the Antarctic Syowa Mesosphere, Stratosphere, and Troposphere/Incoherent Scatter Radar at Syowa Station (SYO; −69.00°S, 39.58°E), Antarctica, and the Middle Atmosphere Alomar Radar System at Andøya (AND; 69.30°N, 16.04°E), Norway. The PMWE were observed during 03-07 UT on 21 March 2017, just after the arrival of corotating interaction region in front of high-speed solar wind stream. An isolated substorm occurred at 04 UT during this interval. Electromagnetic ion cyclotron (EMIC) waves and whistler mode chorus waves were simultaneously observed near the magnetic equator and showed similar temporal variations to that of the PMWE. These results indicate that chorus waves as well as EMIC waves are drivers of precipitation of energetic electrons, including relativistic electrons, which make PMWE detectable at 55-to 80-km altitude. Cosmic noise absorption measured with a 38.2-MHz imaging riometer and low-altitude echoes at 55-70 km measured with an medium-frequency radar at SYO also support the relativistic electron precipitation. We suggest a possible scenario in which the various phenomena observed in near-Earth space, such as magnetospheric plasma waves (EMIC waves and chorus waves), pulsating auroras, cosmic noise absorption, and PMWE, can be explained by the interaction between the high-speed solar wind containing corotating interaction regions and the magnetosphere.

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Section: Discussionmentioning

confidence: 99%

Direct Comparison Between Magnetospheric Plasma Waves and Polar Mesosphere Winter Echoes in Both Hemispheres

et al. 2019

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“…Using electron density profiles from ISRs it is possible to estimate Hall and Pedersen conductivities in the ionosphere (Hosokawa et al, 2010;Kirkwood et al, 1988), energy spectra of precipitating electrons (Fang et al, 2010;Semeter and Kamalabadi, 2005;Sivadas et al, 2017), ionospheric electron heating (Liang et al, 2018), and Hall and Pedersen currents. Atmospheric radars such as PANSY in Antarctica (Sato et al, 2014) can be used to identify deep mesospheric ionization during diffuse or pulsating aurora (Kataoka et al, 2019). SuperDARN, a global network of highfrequency radars in the Arctic and Antarctic, uses coherent scatter signals to study ionospheric plasma convection.…”

Section: Recent Advances 21 Observation Techniquementioning

confidence: 99%

Diffuse and Pulsating Aurora

et al. 2020

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This chapter reviews fundamental properties and recent advances of diffuse and pulsating aurora. Diffuse and pulsating aurora often occurs on closed field lines and involves energetic electron precipitation by wave-particle interaction. After summarizing the definition, large-scale morphology, types of pulsation, and driving processes, we review observation techniques, occurrence, duration, altitude, evolution, small-scale structures, fast modulation, relation to high-energy precipitation, the role of ECH waves, reflected and secondary electrons, ionosphere dynamics, and simulation of wave-particle interaction. Finally we discuss open questions of diffuse and pulsating aurora.

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“…The Arase satellite orbits in an elliptical orbit with a perigee of 400 km and an apogee of 32,000 km, covering a wide L‐shell region up to about 10–11 to observe the entire region of the radiation belts. There were several good opportunities of coordinated campaign events between the Arase satellite and ground‐based observations at SYO (Kataoka et al, 2019; Tanaka et al, 2019). In this study, we show the magnetic field data from MGF instrument (Matsuoka et al, 2018) to see the distorted magnetic field of the inner magnetosphere before and after the substorm onset.…”

Section: Conjugate Observation Settingsmentioning

confidence: 99%

Asymmetric Development of Auroral Surges in the Northern and Southern Hemispheres

Uchida

Kataoka

Kadokura

et al. 2020

Geophysical Research Letters

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Simultaneous eastward and westward traveling surges were observed at Tjörnes, Iceland, and Syowa station, Antarctica, respectively. Several remarkable differences were identified. (1) The position of the initial bright spot was shifted by 1.7 to 2.3 MLT between both hemispheres. (2) The surges differ in traveling speed between the eastward traveling surge (6.5 km s−1) and the westward traveling surge (1.3 km s−1). (3) The Arase satellite was located on a geomagnetic field line connecting both ground stations and observed a significant excess in westward component of the magnetic field, which is consistent with the large shifts of the initial bright spots in both hemispheres. (4) The background Hall current flows eastward (Northern Hemisphere) and westward (Southern Hemisphere). The observed north‐south asymmetry of the traveling surges suggests that the ionosphere can play an essential role in controlling the fundamental spatiotemporal development of auroras in both hemispheres.

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Transient ionization of the mesosphere during auroral breakup: Arase satellite and ground-based conjugate observations at Syowa Station

Cited by 9 publications

References 52 publications

Direct Comparison Between Magnetospheric Plasma Waves and Polar Mesosphere Winter Echoes in Both Hemispheres

Direct Comparison Between Magnetospheric Plasma Waves and Polar Mesosphere Winter Echoes in Both Hemispheres

Diffuse and Pulsating Aurora

Asymmetric Development of Auroral Surges in the Northern and Southern Hemispheres

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