Simultaneous ground and satellite observations of an isolated proton arc at subauroral latitudes

Sakaguchi, Kaori; Shiokawa, K.; Ieda, A.; Miyoshi, Yoshizumi; Otsuka, Yuichi; Ogawa, T.; Connors, Martin; Donovan, E.; Rich, F. J.

doi:10.1029/2006ja012135

Cited by 63 publications

(87 citation statements)

References 29 publications

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“…Since the geomagnetic latitude of ATH is ~62 o , auroral arcs separated equatorward from the auroral oval are often observed by the imager. Figure 3 shows solar wind and IMF data and ground variations of aurora (keograms) and magnetic field (ordinary magnetograms and dynamic spectra) during the isolated proton arc event at ATH on September 5, 2005, reported by Sakaguchi et al [2007]. An isolated arc was observed at 0500-0640 UT in all three emissions as seen in the keograms.…”

Section: Observations Of Auroral Arcs Equatorward Of the Oval At Athamentioning

confidence: 95%

The Optical Mesosphere Thermosphere Imagers (OMTIs) for network measurements of aurora and airglow

Shiokawa¹,

Hosokawa²,

Sakaguchi³

et al. 2009

AIP Conference Proceedings

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A new digital all-sky imager experiment for optical auroral studies in conjunction with the Scandinavian twin auroral radar experiment Rev. ABSTRACTThe Optical Mesosphere Thermosphere Imagers (OMTIs) currently consist of eight all-sky cooled-CCD imagers and several interferometers and spectrometers. They are making routine observations of aurora and airglow in Japan, Australia, Indonesia, and Canada. Here we show recent results of OMTIs particularly from the two Canadian stations at Resolute Bay (RSB) and Athabasca (ATH). At RSB, we observe polar-cap plasma patches almost always during southward IMF periods. From two-dimensional cross-correlation analyses, we determine velocity vectors of the patches, which indicates the ionospheric convection vector, showing high correlation with the IMF-By and -Bz variations. At ATH, we often observe isolated proton arcs and Stable Auroral Red (SAR) arcs, which are located equatorward of the auroral oval. The appearance of the isolated proton arcs is highly correlated with the Pc 1 geomagnetic pulsations measured simultaneously at ATH, suggesting interactions between the electromagnetic ion cyclotron (EMIC) waves and protons in the vicinity of the plasmapause and the ring current. Similar interactions without waves are also suggested for the SAR arcs, which appear after the substorm expansion phase even without geomagnetic storms. These observations show promising capability to monitor magnetospheric processes from the ground stations, which would contribute to the future satellite projects, such as THEMIS, ERG, and Scope/Xscale.

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Section: Observations Of Auroral Arcs Equatorward Of the Oval At Athamentioning

confidence: 95%

The Optical Mesosphere Thermosphere Imagers (OMTIs) for network measurements of aurora and airglow

Shiokawa¹,

Hosokawa²,

Sakaguchi³

et al. 2009

AIP Conference Proceedings

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“…As shown by Jun et al (2014Jun et al ( , 2016, comparison of Pc1 pearl structures (amplitude modulation) at different stations may help understanding the generation mechanisms of the pearl structure through beating of different waves during duct propagation. Comparison with all-sky airglow/aurora imager data gives us an interesting opportunity to monitor interaction between EMIC waves and ring-current protons/relativistic electrons (e.g., Sakaguchi et al 2007Sakaguchi et al , 2008Sakaguchi et al , 2012Miyoshi et al 2008;Nomura et al 2011Nomura et al , 2012Nomura et al , 2016Ozaki et al 2016). …”

Section: Induction Magnetometermentioning

confidence: 99%

Ground-based instruments of the PWING project to investigate dynamics of the inner magnetosphere at subauroral latitudes as a part of the ERG-ground coordinated observation network

Shiokawa

Katoh

Hamaguchi

et al. 2017

Earth Planets Space

102

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The plasmas (electrons and ions) in the inner magnetosphere have wide energy ranges from electron volts to megaelectron volts (MeV). These plasmas rotate around the Earth longitudinally due to the gradient and curvature of the geomagnetic field and by the co-rotation motion with timescales from several tens of hours to less than 10 min. They interact with plasma waves at frequencies of mHz to kHz mainly in the equatorial plane of the magnetosphere, obtain energies up to MeV, and are lost into the ionosphere. In order to provide the global distribution and quantitative evaluation of the dynamical variation of these plasmas and waves in the inner magnetosphere, the PWING project (study of dynamical variation of particles and waves in the inner magnetosphere using ground-based network observations, http://www.isee.nagoya-u.ac.jp/dimr/PWING/) has been carried out since April 2016. This paper describes the stations and instrumentation of the PWING project. We operate all-sky airglow/aurora imagers, 64-Hz sampling induction magnetometers, 40-kHz sampling loop antennas, and 64-Hz sampling riometers at eight stations at subauroral latitudes (~ 60° geomagnetic latitude) in the northern hemisphere, as well as 100-Hz sampling EMCCD cameras at three stations. These stations are distributed longitudinally in Canada, Iceland, Finland, Russia, and Alaska to obtain the longitudinal distribution of plasmas and waves in the inner magnetosphere. This PWING longitudinal network has been developed as a part of the ERG (Arase)-ground coordinated observation network. The ERG (Arase) satellite was launched on December 20, 2016, and has been in full operation since March 2017. We will combine these ground network observations with the ERG (Arase) satellite and global modeling studies. These comprehensive datasets will © The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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“…Imager 6 at Resolute Bay (RSB) observes sun-aligned auroral arcs and polar cap patches (Hosokawa et al, 2006). Imager 7 at Athabasca (ATH) observes auroras at subauroral latitudes (e.g., Sakaguchi et al, 2007). Other imagers at mid-and low latitudes in Japan (Rikubetsu (RIK), Shigaraki (SGK), Sata (STA), and Yonaguni (YNG)), Indonesia (Kototabang (KTB)), and Australia (Darwin (DRW)) observe atmospheric gravity waves in the mesopause region and traveling ionospheric disturbances and plasma bubbles in the thermosphere and the ionosphere.…”

Section: Details Of the Airglow Imagersmentioning

confidence: 99%

Propagation characteristics of nighttime mesospheric and thermospheric waves observed by optical mesosphere thermosphere imagers at middle and low latitudes

2009

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We review measurements of nighttime atmospheric/ionospheric waves in the upper atmosphere in Japan, Indonesia, and Australia, using all-sky airglow imagers of optical mesosphere thermosphere imagers (OMTIs). The imagers observe two-dimensional patterns of airglow emissions from oxygen (wavelength: 557.7 nm) and hydroxyl (OH) (near-infrared band) in the mesopause region (80-100 km) and from oxygen (630.0 nm) in the thermosphere/ionosphere (200-300 km). Several statistical studies were done to investigate propagation characteristics of small-scale (less than 100 km) gravity waves in the mesopause region and medium-scale traveling ionospheric disturbances (MSTIDs, ∼100-1,000 km) in the thermosphere/ionosphere. Clear seasonal variations of occurrence and propagation directions were reported for these waves. The propagation directions in the mesopause region are controlled by wind filtering, ducting processes and relative location to the wave sources in the troposphere. Poleward-propagating waves tend to be observed in the summer in the mesopause region at several stations, suggesting that mesospheric gravity waves are generated by intense convective activity in the equatorial troposphere. On the other hand, systematic equatorward and westward motions were observed for all seasons for nighttime MSTIDs in the midlatitude ionosphere with geomagnetic conjugacy between the northern and southern hemispheres. Ionospheric instabilities may play important role for the generation and propagation of these MSTIDs. We also give an example of simultaneous observation of quasi-periodic southward-moving waves in the mesopause region and in the thermosphere at the geographic equator. From these results, we discuss mean wind acceleration by mesospheric gravity waves and penetration of gravity waves from the mesosphere to the thermosphere.

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Simultaneous ground and satellite observations of an isolated proton arc at subauroral latitudes

Cited by 63 publications

References 29 publications

The Optical Mesosphere Thermosphere Imagers (OMTIs) for network measurements of aurora and airglow

The Optical Mesosphere Thermosphere Imagers (OMTIs) for network measurements of aurora and airglow

Ground-based instruments of the PWING project to investigate dynamics of the inner magnetosphere at subauroral latitudes as a part of the ERG-ground coordinated observation network

Propagation characteristics of nighttime mesospheric and thermospheric waves observed by optical mesosphere thermosphere imagers at middle and low latitudes

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