Plasma depletions lasting into daytime during the recovery phase of a geomagnetic storm in May 2017: Analysis and simulation of GPS total electron content observations

Otsuka, Yuichi; Shinbori, Atsuki; Sori, Takuya; Tsugawa, Takuya; Nishioka, Michi; Huba, J. D.

doi:10.26464/epp2021046

Cited by 10 publications

(12 citation statements)

References 17 publications

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“…These are sudden electron density depletions observed in the nightside equatorial ionosphere. Observations have confirmed the existence of plasma bubbles below the peak ionization region (about 200 km) and their eventual raising to altitudes up to about 1,700 km (Otsuka et al, 2002(Otsuka et al, , 2021Oya et al, 1986). Rayleigh-Taylor instability is considered to be the most likely cause of the bubble formation at Earth (Kil, 2015;Oliveira et al, 2020).…”

Section: Discussionmentioning

confidence: 93%

Ionospheric Plasma Depletions at Mars Observed by the MAVEN Spacecraft

et al. 2022

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Mars is an unmagnetized planet with a thin layer of atmosphere compared to Earth. Due to the precipitation of energetic solar charged particles (mostly electrons) and the absorption of incoming solar radiation (EUV and X-rays), the neutral atmosphere of Mars becomes partially ionized forming the dayside ionosphere composed of ions and free electrons (Krasnopolsky, 2002;Němec et al., 2010). The dayside ionosphere is photochemically controlled below the exobase (about 220 km) (Mendillo et al., 2017). On the other hand, the nightside ionosphere is formed-apart from the impact ionization by precipitating energetic particles-due to the plasma transport from the dayside (

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Section: Discussionmentioning

confidence: 93%

Ionospheric Plasma Depletions at Mars Observed by the MAVEN Spacecraft

et al. 2022

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“…Under normal conditions, the photoionization process generates plasma, and a decreased plasma density region can be filled by the newly created plasma during the process. Some previous study has suggested that the early morning recovery‐phase of storms can contribute to long‐lasting plasma depletions even with photoionization (Otsuka et al., 2021).…”

Section: Resultsmentioning

confidence: 99%

Equatorial Plasma Bubbles Observed at Dawn and After Sunrise Over South America During the 2015 St. Patrick's Day Storm

Carmo

Nardin

et al. 2022

JGR Space Physics

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“…Plasma bubbles contain plasma density irregularities (Booker & Wells, 1938; Woodman & La Hoz, 1976) and have field‐aligned structures connecting the Northern and Southern Hemispheres (Martinis & Mendillo, 2007; Otsuka et al., 2002; Tsunoda, 1980a). There are many studies conducted on plasma bubbles using ionosondes (Abdu et al., 2003), all‐sky imagers (Otsuka et al., 2002; Martinis & Mendillo, 2007), VHF radars (Ajith et al., 2015; de Paula et al., 2019; Saito et al., 2008; Tulasi Ram et al., 2008, 2017; Woodman & La Hoz, 1976), and global navigation satellite system (GNSS) networks (Cherniak & Zakharenkova, 2016; Li et al., 2018; Ma & Maruyama, 2006; Otsuka et al., 2021; Sori, Shinbori, et al., 2022; Sori, Otsuka, et al., 2022; Valladares et al., 2004).…”

Section: Introductionmentioning

confidence: 99%

First Detection of Midlatitude Plasma Bubble by SuperDARN During a Geomagnetic Storm on May 27 and 28, 2017

et al. 2023

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We used the global navigation satellite system‐total electron content (TEC) and Super Dual Auroral Radar Network (SuperDARN) radar to elucidate the characteristics of the plasma bubble extending to midlatitudes over North America during a geomagnetic storm on 27 and 28 May 2017. To identify plasma bubbles, we analyzed the rate of the TEC index (ROTI), which is a good indicator of the occurrence of plasma bubbles. The enhanced ROTI region expanded up to 50°N (geomagnetic latitude), and the upper limit of this region coincided with the equatorward wall of the midlatitude trough. Two‐dimensional ROTI maps show that the enhanced midlatitude ROTI region moved westward at a bulk speed of approximately 310 m/s. The Fort Hays East SuperDARN radar also detected the radar echo, showing the existence of plasma density irregularities at ∼10‐m scales within the midlatitude plasma bubble. The radar echo had a westward velocity of ∼300 m/s, which is almost consistent with the westward motion of the enhanced midlatitude ROTI region. We deduced that the westward propagation of the plasma bubble could be caused by a poleward sub‐auroral polarization stream electric field. The observed radar echo overlapping with the enhanced ROTI region had a narrower spectral width (<50 m/s) than that of the auroral activity. This feature resembled that of the type 1 echo, although the Doppler velocity was smaller than the ion acoustic speed at the F‐region height. This is the first case in which plasma density irregularities within plasma bubbles were captured by the SuperDARN radar.

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Plasma depletions lasting into daytime during the recovery phase of a geomagnetic storm in May 2017: Analysis and simulation of GPS total electron content observations

Cited by 10 publications

References 17 publications

Ionospheric Plasma Depletions at Mars Observed by the MAVEN Spacecraft

Ionospheric Plasma Depletions at Mars Observed by the MAVEN Spacecraft

Equatorial Plasma Bubbles Observed at Dawn and After Sunrise Over South America During the 2015 St. Patrick's Day Storm

First Detection of Midlatitude Plasma Bubble by SuperDARN During a Geomagnetic Storm on May 27 and 28, 2017

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