The Occurrence Feature of Plasma Bubbles in the Equatorial to Midlatitude Ionosphere During Geomagnetic Storms Using Long‐Term GNSS‐TEC Data

Sori, Takuya; Shinbori, Atsuki; Otsuka, Yuichi; Tsugawa, Takuya; Nishioka, Michi

doi:10.1029/2020ja029010

Cited by 13 publications

(14 citation statements)

References 60 publications

(154 reference statements)

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“…Thus, storm-time electric fields serve as a major source of the equatorial ionosphere modification, forcing significant changes in equatorial plasma drifts and typical EPBs generation. Previous studies reported occurrence of the intense EPBs associated with PPEF effects during different geomagnetic storms (Abdu, 2012;Carter et al, 2016;Kil et al, 2016;Li et al, 2018;Sori et al, 2021;Tulasi Ram et al, 2008;Zakharenkova et al, 2019). However, it is still impossible to predict how strong will the ionosphere's response be to a particular geomagnetic storm and when/ where the storm-induced EPBs may occur around the globe.…”

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confidence: 99%

Development of the Storm‐Induced Ionospheric Irregularities at Equatorial and Middle Latitudes During the 25–26 August 2018 Geomagnetic Storm

Cherniak

Zakharenkova

2022

Space Weather

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The 25-26 August 2018 space weather event was classified as the third largest geomagnetic storm of the twenty fourth solar cycle (in terms of the Dst minimum excursion) after the March 2015 and June 2015 geomagnetic storms. The slowly moving coronal mass ejection (CME) occurring on 20 August 2018 was expected to cause a minor geomagnetic activity only, but surprisingly it turned into a strong geomagnetic storm at the very end of the twenty fourth solar cycle. The space weather events of such intensity occurring during the solar minimum period and at the background of the very low ionospheric density can result in a strong ionosphere-thermosphere response. Several recent papers were devoted to the investigation of the positive and negative ionospheric storm effects on the ionospheric density distribution over the globe (Astafyeva et al., 2020;Mansilla & Zossi, 2020;

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mentioning

confidence: 99%

Development of the Storm‐Induced Ionospheric Irregularities at Equatorial and Middle Latitudes During the 25–26 August 2018 Geomagnetic Storm

Cherniak

Zakharenkova

2022

Space Weather

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“…Finally, we convert the coordinates of the rTEC data into geomagnetic coordinates with the Altitude‐Adjusted Corrected Geomagnetic Model (AACGM; Shepherd, 2014), and conduct a superposed epoch analysis of the rTEC data together with solar wind parameters, IMF, and geomagnetic indices (AE and SYM‐H) for 663 geomagnetic storm events that occurred during 2000–2019. Here, we select the SYM‐H variation with the minimum value of ≤ 40 nT as a geomagnetic storm and define the universal time giving the minimum SYM‐H value as a zero epoch time (Sori et al., 2021). Furthermore, we classify these geomagnetic storms into four categories: weak, moderate, strong, and severe events.…”

Section: Observation Data and Analysis Methodsmentioning

confidence: 99%

Statistical Behavior of Large‐Scale Ionospheric Disturbances From High Latitudes to Mid‐Latitudes During Geomagnetic Storms Using 20‐yr GNSS‐TEC Data: Dependence on Season and Storm Intensity

et al. 2022

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To establish the statistical behavior of ionospheric TEC variations from high latitudes to mid‐latitudes during the main and recovery phases of geomagnetic storms, we conducted a superposed epoch analysis of interplanetary magnetic field, solar wind, geomagnetic indices (AE and SYM‐H), and global navigation satellite system (GNSS)‐total electron content (TEC) data for 20 yr (2000–2019). In this study, we identify 663 geomagnetic storm events with the minimum SYM‐H value of less than −40 nT and investigate the characteristics of the TEC variations for the weak (−60 ≤ SYM‐Hmin < −40 nT), moderate (−100 ≤ SYM‐Hmin < −60 nT), and strong (−150 ≤ SYM‐Hmin < −100 nT) geomagnetic storms. The main results obtained from the present study are as follows: (a) The TEC enhancements related to the tongue of ionization (TOI), auroral oval, and storm‐enhanced density (SED) plume are more dominant in winter than in summer during the main phase of geomagnetic storms. (b) The structure of the mid‐latitude trough in the nighttime sector becomes unclear in winter. (c) The TEC depletion at auroral and mid‐latitudes (40°–70° GMLAT: geomagnetic latitude) starts to appear in the morning sector (8–10 hr GMLT: geomagnetic local time) during the main phase of geomagnetic storms and the decreased region extends in the lower latitude and GMLT directions with time. The negative storm activity tends to be enhanced significantly as the storm intensity becomes larger. The activity of the TEC depletion is dominant in summer than in winter, which is agreement with the classical ionospheric storm scenario.

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“…We derived the GNSS-TEC value with time resolution of 30 s from the collected GNSS data according to the procedure described in several papers (50)(51)(52)(53). To quantify the range between satellite and receiver, we need to know the time delay of the pseudorandomnoise code sequences of the received signal.…”

Section: Derivation Of Tec Rot and Roti Grid Data From Rinex (Receive...mentioning

confidence: 99%

Generation of equatorial plasma bubble after the 2022 Tonga volcanic eruption

Shinbori

Sori

Otsuka

et al. 2022

Preprint

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Equatorial plasma bubbles are a phenomenon of plasma density depletion with small-scale density irregularities, normally observed in the equatorial ionosphere. This phenomenon, which impacts satellite-based communications, was observed in the Asia-Pacific region after the largest-on-record January 15, 2022 eruption of the Tonga volcano. We used satellite and ground-based ionospheric observations to demonstrate that an air pressure wave triggered by the Tonga volcanic eruption could cause the emergence of an equatorial plasma bubble. The most prominent observation result shows a sudden increase of electron density and height of the ionosphere several ten minutes to hours before the arrival of the air pressure wave in the lower atmosphere. After the ionospheric perturbations, plasma density depletion appeared in the equatorial and low-latitude ionosphere. We stress that tracking of such ionospheric signals before the initial arrival of the air pressure wave helps us to predict the arrival and scale of Tsunami.

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The Occurrence Feature of Plasma Bubbles in the Equatorial to Midlatitude Ionosphere During Geomagnetic Storms Using Long‐Term GNSS‐TEC Data

Abstract: Plasma bubbles, which have a significantly sharp depletion in the plasma density, are ionospheric irregularities in the low-latitude and equatorial regions. Within the plasma bubbles, plasma density irregularities exist at different spatial scales (

Cited by 13 publications

References 60 publications

Development of the Storm‐Induced Ionospheric Irregularities at Equatorial and Middle Latitudes During the 25–26 August 2018 Geomagnetic Storm

Development of the Storm‐Induced Ionospheric Irregularities at Equatorial and Middle Latitudes During the 25–26 August 2018 Geomagnetic Storm

Statistical Behavior of Large‐Scale Ionospheric Disturbances From High Latitudes to Mid‐Latitudes During Geomagnetic Storms Using 20‐yr GNSS‐TEC Data: Dependence on Season and Storm Intensity

Generation of equatorial plasma bubble after the 2022 Tonga volcanic eruption

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