New understanding achieved from 2 years of Chinese ionospheric investigations

Liu, Libo; Wan, Weixing

doi:10.1007/s11434-016-1035-9

Cited by 7 publications

(4 citation statements)

References 101 publications

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“…Being considered as the most complicated phenomena in the T-I system, ionospheric storms have been investigated as a hot spot for several decades [Prölss, 2008;Liu and Wan, 2016], and various features of the ionospheric response to geomagnetic storms have been revealed by observations and simulations [e.g., Prölss, In low latitude and equatorial regions, the storm time ionospheric disturbed electric fields are a particularly important contributor to ionospheric storm effects. The disturbed electric fields can affect the occurrence of plasma density irregularities and redistribute the ionospheric plasma to create ionospheric storm effects in low latitude and equatorial regions [e.g., Fejer, 1986;Abdu, 1997;Sastri et al, 2000;Bagiya et al, 2011;Kuai et al, 2015;Carter et al, 2016].…”

Section: Introductionmentioning

confidence: 99%

Effects of disturbed electric fields in the low‐latitude and equatorial ionosphere during the 2015 St. Patrick's Day storm

Kuai

Liu

et al. 2016

JGR Space Physics

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The 2015 St. Patrick's Day geomagnetic storm with SYM‐H value of −233 nT is an extreme space weather event in the current 24th solar cycle. In this work, we investigated the main mechanisms of the profound ionospheric disturbances over equatorial and low latitudes in the Asian‐Australian sector and the American sector during this super storm event. The results reveal that the disturbed electric fields, which comprise penetration electric fields (PEFs) and disturbance dynamo electric fields (DDEFs), play a decisive role in the ionospheric storm effects in low latitude and equatorial regions. PEFs occur on 17 March in both the American sector and the Asian‐Australian sector. The effects of DDEFs are also remarkable in the two longitudinal sectors. Both the DDEFs and PEFs show the notable local time dependence, which causes the sector differences in the characteristics of the disturbed electric fields. This differences would further lead to the sector differences in the low‐latitude ionospheric response during this storm. The negative storm effects caused by the long‐duration DDEFs are intense over the Asian‐Australian sector, while the repeated elevations of hmF2 and the equatorial ionization anomaly intensifications caused by the multiple strong PEFs are more distinctive over the American sector. Especially, the storm time F3 layer features are caught on 17 March in the American equatorial region, proving the effects of the multiple strong eastward PEFs.

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Section: Introductionmentioning

confidence: 99%

Effects of disturbed electric fields in the low‐latitude and equatorial ionosphere during the 2015 St. Patrick's Day storm

Kuai

Liu

et al. 2016

JGR Space Physics

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“…The free electrons and ions in the ionosphere are produced via ionization of the neutral particles both by extreme ultraviolet radiation from the Sun and by collisions with energetic particles [ Schunk and Nagy , ]. Geomagnetic storms occur when the solar wind dynamic pressure has a large sudden change at the magnetopause, and many researchers have found that the plasma can be affected by geomagnetic activities [ Habarulema and Carelse , 2016; Liu and Wan , ]. In order to extract the plasma disturbances related to earthquake, we excluded the ionospheric perturbation effected by solar, geomagnetic storm, substorm, and so on according to the magnetic indexes.…”

Section: Analyzing Methods and Resultsmentioning

confidence: 99%

Variations of ionospheric plasma at different altitudes before the 2005 Sumatra Indonesia M_s 7.2 earthquake

et al. 2016

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In recent years, many researchers pay more attention to abnormities before earthquake, and in this study, seismo‐ionospheric synchronous disturbances at different altitudes by GPS and satellite observations were first studied around one Sumatra Indonesia Ms 7.2 earthquake that occurred on 5 July 2005. By using the same temporal and spatial methods, data of GPS‐total electron content (TEC) from Jet Propulsion Laboratory, electron density (Ne) from Detection of Electro‐Magnetic Emissions Transmitted from Earthquake Regions, and ion density (Ni) from Defense Meteorological Satellite Program were deeply analyzed. The ionospheric plasma disturbances in GPS‐TEC and increasement of Ne at 710 km were found on 4 July, and plasma density at the three altitudes has all increased on 7 July after the earthquake. All the disturbances were not just above the epicenter. TEC perturbations have happened at the east of the epicenter for the two days, and electron density enhancement at 710 km has moved to west of the TEC perturbations at the same time on 4 July, which may be caused by E × B drift. The moving direction of upgoing plasma was simulated using SAMI2 model. The results have shown that the plasma will move to higher altitude along the geomagnetic force line, which could exactly account for the plasma density enhancement in the northern direction of the geomagnetic south latitude earthquake.

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“…The storm time ionospheric variations have been investigated as a hot spot for several decades (Mendillo, 2006). The increases and depletions in ionospheric electron density are widely attributed to the coupled compositions, thermodynamics, and electrodynamics (e.g., Abdu, 1997; Astafyeva et al., 2015; Danilov & Lăstovička, 2001; Heelis, 2008; Liu & Wan, 2016; Prölss, 1995, 2008; Zhang et al., 2019). However, the electron temperature under magnetically active conditions has not yet received much attention.…”

Section: Introductionmentioning

confidence: 99%

Extreme Enhancements of Electron Temperature in Low Latitude Topside Ionosphere During the October 2016 Storm

Zhang

Liu

et al. 2022

JGR Space Physics

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We use the in‐situ observations of DMSP and SWARM satellites to report the changes of the topside ionospheric electron temperature during the October 2016 storm. Electron temperature in the afternoon sector dramatically increases in low latitudes in the recovery phase of the storm. Furthermore, the temperature enhancements have an obvious dependence on longitude and are mainly centralized around 100°–150°E in different satellite observations. The temperature enhancements attain more than 2,000 K at 840 km and 1,500 K at 450 km around the magnetic equator. The decrease in the electron‐ion collision cooling rate, resulting from the lessened topside electron density, could not fully explain the temperature enhancement. At the same time, the electron densities in crests of the equatorial ionization anomaly are suppressed drastically at 100°–150°E, which cause a less heat conduction effect from the equatorial topside ionosphere to low altitudes via magnetic field lines and heat the topside ionospheric electron temperature. Further analysis indicates that dayside westward disturbance dynamo electric field presents a significant longitude structure and is a primary driver for the topside ionospheric temperature enhancement during the storm.

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New understanding achieved from 2 years of Chinese ionospheric investigations

Cited by 7 publications

References 101 publications

Effects of disturbed electric fields in the low‐latitude and equatorial ionosphere during the 2015 St. Patrick's Day storm

Effects of disturbed electric fields in the low‐latitude and equatorial ionosphere during the 2015 St. Patrick's Day storm

Variations of ionospheric plasma at different altitudes before the 2005 Sumatra Indonesia M_s 7.2 earthquake

Extreme Enhancements of Electron Temperature in Low Latitude Topside Ionosphere During the October 2016 Storm

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New understanding achieved from 2 years of Chinese ionospheric investigations

Cited by 7 publications

References 101 publications

Effects of disturbed electric fields in the low‐latitude and equatorial ionosphere during the 2015 St. Patrick's Day storm

Effects of disturbed electric fields in the low‐latitude and equatorial ionosphere during the 2015 St. Patrick's Day storm

Variations of ionospheric plasma at different altitudes before the 2005 Sumatra Indonesia Ms 7.2 earthquake

Extreme Enhancements of Electron Temperature in Low Latitude Topside Ionosphere During the October 2016 Storm

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Variations of ionospheric plasma at different altitudes before the 2005 Sumatra Indonesia M_s 7.2 earthquake