Multievent Analysis of Oscillatory Motion of Medium‐Scale Traveling Ionospheric Disturbances Observed by a 630‐nm Airglow Imager Over Tromsø

Yadav, Sneha; Shiokawa, K.; Oyama, Shin‐ichiro; Otsuka, Yuichi

doi:10.1029/2019ja027598

Cited by 3 publications

(16 citation statements)

References 64 publications

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“…In contrast to the observations presented in Yadav et al. (2020), there was no major change in the direction of MSTIDs during the current event. The authors suggest that the westward turning of MSTIDs was likely a result of a poleward‐directed magnetospheric electric field that is imposed on the ionosphere during intervals of enhanced geomagnetic activity.…”

Section: Discussioncontrasting

confidence: 99%

“…Shiokawa et al (2013) presented a statistical analysis of high-latitude nighttime MSTIDs observed by all-sky airglow imagers in the European and Canadian sectors and suggested that they are linked to the auroral electric field and caused mainly by the Perkins and E-F coupling instabilities. While the current event is much stronger in magnitude (in terms of electric field strength and phase speed) compared to these previous reports, the mechanism shown in Figure 11 is in good agreement with Shiokawa et al (2012Shiokawa et al ( , 2013 and Yadav et al (2020) during geomagnetic disturbances. We can note from Figure 8, that the oscillations in the SuperDARN and GNSS TEC data sets are observed in the afternoon-midnight sector, between 15 and 20 MLT.…”

Section: Discussionsupporting

confidence: 82%

“…The occurrence of electrified MSTIDs during moderately disturbed geomagnetic conditions was reported previously (Shiokawa et al., 2013; Yadav et al., 2020). A multi‐event analysis of MSTIDs observed by a 630‐nm airglow imager over Tromsø (magnetic latitude 66.7°N) was presented by Yadav et al.…”

Section: Discussionsupporting

confidence: 75%

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Storm Time Electrified MSTIDs Observed Over Mid‐Latitude North America

et al. 2023

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Traveling Ionospheric Disturbances (TIDs; Munro, 1948) are wave-like structures which propagate through the ionosphere. TIDs are most commonly expected to be driven by Atmospheric Gravity Waves (AGWs) originating in the neutral atmosphere (Hines, 1960) and can be sensed with instruments used for monitoring ionospheric dynamics such as Global Navigational Satellite Service (GNSS) Total Electron Content (TEC;Saito et al., 1998) and coherent scatter radars (Fukao et al., 1991;Samson et al., 1990). TIDs are further classified as either Large-Scale (LSTIDs) or MSTIDs based on their spatio-temporal scales (Georges, 1968). MSTIDs typically have a time period of 15-60 min, phase velocities of 100-300 m/s, and wavelengths between 200 and 800 km. On the other hand, LSTIDs have phase speeds between 400 and 10,00 m/s, periods above 30 min, and wavelengths above 1,000 km (Hocke & Schlegel, 1996;Hunsucker, 1982). The differences between MSTIDs and LSTIDs are not just limited to their spatio-temporal scales, previous studies have shown that the underlying generation mechanisms and the physics of their propagation also differ (Hocke & Schlegel, 1996). MSTIDs are often linked to AGWs, which are a neutral atmospheric phenomenon generally carrying more energy than the TIDs themselves (Hunsucker, 1982). Such AGW-driven MSTIDs are more commonly reported at high latitudes, and on the dayside, and in the winter (Bristow et al., 1994;Frissell et al., 2014). The AGWs are in turn expected to be driven by factors such tropospheric weather (Chou et al., 2017), Joule heating (Chimonas & Hines, 1970), and ground-based disturbances including tsunamis and earthquakes (Liu et al., 2011). Determining the sources of AGWs/MSTIDs can be challenging since they travel thousands of kilometers from the source and dissipate along the propagation paths (e.g.,

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionsupporting

confidence: 82%

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Storm Time Electrified MSTIDs Observed Over Mid‐Latitude North America

et al. 2023

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“…The G-type MSTIDs, which seem to be caused by gravity waves in the thermosphere, have the following characteristics in airglow images: (a) invading continuously into the aurora seen in the northern part of the airglow images, (b) having more sinusoidal phase structures, and (c) propagating uni-directionally, and not showing temporal change of the propagation direction. The former-type (I-type) MSTIDs have been reported by Shiokawa et al (2012) and Yadav et al (2020). The latter-type (G-type) MSTIDs have been reported by Shiokawa et al (2013), particularly at summertime in Athabasca in their analysis.…”

Section: Multi-event Analysis and Discussionmentioning

confidence: 84%

“…(2012) and Yadav et al. (2020). The latter‐type (G‐type) MSTIDs have been reported by Shiokawa et al.…”

Section: Multi‐event Analysis and Discussionmentioning

confidence: 95%

Multi‐Event Analysis of Magnetosphere‐Ionosphere Coupling of Nighttime Medium‐Scale Traveling Ionospheric Disturbances From the Ground and the Arase Satellite

et al. 2023

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Kawai et al. (2021) reported the first ground‐satellite conjugate observation of nighttime medium‐scale traveling ionospheric disturbances (MSTIDs), by analyzing measurements from an airglow imager at Gakona (geographic latitude: 62.39°N, geographic longitude: 214.78°E, magnetic latitude: 63.60°N) and the Arase satellite in the magnetosphere on 3 November 2018. The Arase satellite observed variations in both the polarization electric field and the electron density as the Arase footprint passed through the MSTID structures in the ionosphere. In this study, we investigated whether these electric field and density variations associated with MSTIDs at subauroral latitudes are always observed by Arase in the magnetosphere. We used three airglow imagers installed at Gakona, Athabasca (geographic latitude: 54.60°N, geographic longitude: 246.36°E, magnetic latitude: 61.10°N), and Kapuskasing (geographic latitude: 49.39°N, geographic longitude: 277.81°E, magnetic latitude: 58.70°N) and the Arase satellite. We found eight observations of MSTIDs conjugate with Arase. They indicate that electric field and density variations associated with MSTIDs are not always observed in the magnetosphere. These variations tend to be observed in the magnetosphere during geomagnetically quiet times and when the amplitude of the MSTID is large. We categorized the MSTIDs into those caused by plasma instabilities and gravity waves and found that the electric field and density variations can be observed in the magnetosphere for both types of MSTIDs.

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Statistical Analysis of Low‐Latitude Boundary of Polar‐Type Medium‐Scale Traveling Ionospheric Disturbances Observed by a 630‐nm Airglow Imager at Nyrölä, Finland

Sato,

Shiokawa,

Oyama

et al. 2024

JGR Space Physics

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Medium‐scale traveling ionospheric disturbances (MSTIDs) are one of the ionospheric plasma density structures and are observable through 630‐nm airglow images. Previous studies using airglow images at Tromsø (69.6°N, 19.2°E; magnetic latitude: 66.7°N), Norway, reported high‐latitude MSTIDs (here we call them as polar‐type MSTIDs) whose propagation direction changes associated with auroral brightening and magnetic field disturbances. However, there has been little statistical analysis on the connection of MSTIDs occurring at high and middle latitudes. In this study, we statistically analyzed the MSTIDs observed by an airglow imager at Nyrölä (62.3°N, 25.5°E; magnetic latitude: 59.4°N), Finland, which is located ∼7° south of Tromsø, corresponding to subauroral latitudes. The period analyzed was from 23 January 2017, to 30 September 2021. We found 11 cases of MSTIDs during this period. Eight cases were found to be the polar‐type MSTIDs whose motion changes associated with auroral brightening and magnetic field disturbances. We found that 9 cases of MSTID show the low‐latitude boundary at 61° ± 2°N for geographic latitude and 58° ± 2°N for magnetic latitude, indicating disconnection between high‐ and mid‐latitude MSTIDs. We also derived occurrence probability, velocity, wavelength, period, wave front direction, and propagation direction of these MSTIDs. The occurrence probability of MSTIDs at Nyrölä is 1.9%, which is much lower than those at high (Tromsoe, more than 50%) and middle (Japan, ∼30%) latitudes. We discuss these MSTID characteristics at subauroral latitudes based on possible difference of generation mechanisms of nighttime MSTIDs at high and middle latitudes.

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Multievent Analysis of Oscillatory Motion of Medium‐Scale Traveling Ionospheric Disturbances Observed by a 630‐nm Airglow Imager Over Tromsø

Cited by 3 publications

References 64 publications

Storm Time Electrified MSTIDs Observed Over Mid‐Latitude North America

Storm Time Electrified MSTIDs Observed Over Mid‐Latitude North America

Multi‐Event Analysis of Magnetosphere‐Ionosphere Coupling of Nighttime Medium‐Scale Traveling Ionospheric Disturbances From the Ground and the Arase Satellite

Statistical Analysis of Low‐Latitude Boundary of Polar‐Type Medium‐Scale Traveling Ionospheric Disturbances Observed by a 630‐nm Airglow Imager at Nyrölä, Finland

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