Analysis of ionospheric anomalies before the 2011 M w 9.0 Japan earthquake

Yao, Yibin; Chen, Peng; Han, Wei; Zhang, Shun; Peng, WenFei

doi:10.1007/s11434-011-4851-y

Cited by 61 publications

(43 citation statements)

References 27 publications

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“…Thampi et al (2009) used CIT to investigate summer night ionospheric anomalies that occur at middle latitudes. Yao et al (2012a) used CIT technology to inverse the 3-D variations in ionospheric electron density before the Japan M w = 9.0 earthquake on 11 March 2011. The authors excluded the effects of magnetic storms in their study.…”

Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

Temporal and spatial variations in ionospheric electron density profiles over South Africa during strong magnetic storms

Yao

Chen

Zhang

et al. 2013

Nat. Hazards Earth Syst. Sci.

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Observations from the South African TrigNet global navigation satellite system (GNSS) and vertical total electron content (VTEC) data from the Jason-1 satellite were used to analyze the variations in ionospheric electron density profiles over South Africa before and after the severe geomagnetic storms on 15 May 2005. Computerized ionospheric tomography (CIT) was used to inverse the 3-D structure of ionospheric electron density and its response to the magnetic storms. Inversion results showed that electron density significantly increased at 10:00 UT, 15 May compared with that at the same period on 14 May. Positive ionospheric storms were observed in the inversion region during the magnetic storms. Jason-1 data show that the VTEC observed on descending orbits on 15 May significantly increased, whereas that on ascending orbits only minimally changed. This finding is identical to the CIT result

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Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

Temporal and spatial variations in ionospheric electron density profiles over South Africa during strong magnetic storms

Yao

Chen

Zhang

et al. 2013

Nat. Hazards Earth Syst. Sci.

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“…For instance, earthquakes can produce positive or negative ionospheric anomalies (e.g., Zakharenkova et al, 2008;Yao et al, 2012;Guo et al, 2015;Li et al, 2015). Although, such variations are expected to be localized within the earthquake's preparation region (Dobrovolsky et al, 1979).…”

Section: Introductionmentioning

confidence: 99%

Emergence of a localized total electron content enhancement during the G4 geomagnetic storm of September 8, 2017

Sotomayor-Beltran¹

2018

Preprint

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Abstract. In this work, the first results of the analysis on total electron content (TEC) data before, during and after the geomagnetic storm of September 8, 2017 are reported. A common response to geomagnetic storms due to the southern vertical interplanetary magnetic field (Bz) is the enhancement of the electron density in the ionosphere. Vertical TEC (VTEC) from the Center for Orbit determination in Europe (CODE) along with a statistical method were used to identify positive and/or negative ionospheric storms in response to the geomagnetic storm of September 8, 2017. When analysing the response to the G4 storm of September 8, 2017 it was indeed possible to observed an enhancement of the equatorial ionization anomaly (EIA); however what it is was unexpected, was the identification of a local TEC enhancement (LTE) to the south of the EIA (~ 40° S), right over New Zealand and extending towards the south-eastern coast of Australia and also eastward towards the Pacific). This was a very transitory LTE that lasted approximately 2 hours, starting at ~ 02:00 UT on September 8 where its maximum VTEC increase was of 241,2 %. Using the same statistical method we looked for LTEs in a similar category geomagnetic storm, the G4 storm of St. Patrick's day of 2015; however for this storm, no LTEs were identified. As also indicated in a past recent study for the August 15, 2015 geomagnetic storm, an association between the LTE and the excursion of Bz observed during the September 8, 2017 storm is observed. Nevertheless, it is more likely that a direct impact of the super-fountain effect along with another ionospheric physical mechanism may be playing an important role in the production of this LTE.

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“…Some of the stations appeared anomalous, whereas the others did not. Yao et al (2012) investigated pre-earthquake ionospheric anomalies during the 2011 M w = 9.0 Japan earthquake period, using data from GPS and ionosonde stations near the epicenter. They inverted the spatial and temporal distribution of electron density in the ionosphere, and attested an ionospheric precursor of the 11 March earthquake in Japan.…”

Section: Introductionmentioning

confidence: 99%

Analysis of pre-earthquake ionospheric anomalies before the global <i>M</i> = 7.0+ earthquakes in 2010

Yao

Chen

Zhang

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Abstract. The pre-earthquake ionospheric anomalies that occurred before the global M = 7.0+ earthquakes in 2010 are investigated using the total electron content (TEC) from the global ionosphere map (GIM). We analyze the possible causes of the ionospheric anomalies based on the space environment and magnetic field status. Results show that some anomalies are related to the earthquakes. By analyzing the time of occurrence, duration, and spatial distribution of these ionospheric anomalies, a number of new conclusions are drawn, as follows: earthquake-related ionospheric anomalies are not bound to appear; both positive and negative anomalies are likely to occur; and the earthquake-related ionospheric anomalies discussed in the current study occurred 0-2 days before the associated earthquakes and in the afternoon to sunset (i.e. between 12:00 and 20:00 local time). Pre-earthquake ionospheric anomalies occur mainly in areas near the epicenter. However, the maximum affected area in the ionosphere does not coincide with the vertical projection of the epicenter of the subsequent earthquake. The directions deviating from the epicenters do not follow a fixed rule. The corresponding ionospheric effects can also be observed in the magnetically conjugated region. However, the probability of the anomalies appearance and extent of the anomalies in the magnetically conjugated region are smaller than the anomalies near the epicenter. Deep-focus earthquakes may also exhibit very significant pre-earthquake ionospheric anomalies.

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Analysis of ionospheric anomalies before the 2011 M w 9.0 Japan earthquake

Cited by 61 publications

References 27 publications

Temporal and spatial variations in ionospheric electron density profiles over South Africa during strong magnetic storms

Temporal and spatial variations in ionospheric electron density profiles over South Africa during strong magnetic storms

Emergence of a localized total electron content enhancement during the G4 geomagnetic storm of September 8, 2017

Analysis of pre-earthquake ionospheric anomalies before the global <i>M</i> = 7.0+ earthquakes in 2010

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Analysis of ionospheric anomalies before the 2011 M w 9.0 Japan earthquake

Cited by 61 publications

References 27 publications

Temporal and spatial variations in ionospheric electron density profiles over South Africa during strong magnetic storms

Temporal and spatial variations in ionospheric electron density profiles over South Africa during strong magnetic storms

Emergence of a localized total electron content enhancement during the G4 geomagnetic storm of September 8, 2017

Analysis of pre-earthquake ionospheric anomalies before the global &lt;i&gt;M&lt;/i&gt; = 7.0+ earthquakes in 2010

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Analysis of pre-earthquake ionospheric anomalies before the global <i>M</i> = 7.0+ earthquakes in 2010