Electron Density Comparison Between IRI 2007 and DEMETER Satellite Data in Solar Minimum Year

Zhang, Xuemin

doi:10.3319/tao.2014.02.24.01(aa)

Cited by 10 publications

(12 citation statements)

References 39 publications

(46 reference statements)

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“…The ISL measured in situ ionospheric parameters including the electron density and temperature. Zhang [] pointed out that the relative variation in T e and N e measured by the ISL instrument ought to be credible, while the absolute values of the electron density and temperature may not be accurately determined due to the photoelectron contamination. Kakinami et al [] reported that DEMETER N e is lower than that expected from observations by CHAMP and Gravity Recovery and Climate Experiment, but their altitudes were different.…”

Section: Satellite Observations and Data Processingmentioning

confidence: 99%

“…The electron density is higher in the geomagnetic equator region than in the midlatitude region, and the longitudinal structure appears along the geomagnetic equator region. The detailed description on the behavior of the electron density measured by ISL according to the season and solar cycle can be found in the studies of Zhang et al [] and Zhang []. It is clear that only one peak region exists near the equator, in general, so the EIA intensity index derived using two density peaks in the Northern and Southern Hemispheres is not applicable to the altitude and local time of DEMETER during normal conditions.…”

Section: Satellite Observations and Data Processingmentioning

confidence: 99%

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Seismo‐ionospheric coupling appearing as equatorial electron density enhancements observed via DEMETER electron density measurements

et al. 2014

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International audienceWe report the processes and results of statistical analysis on the ionospheric electron densitydata measured by the Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions(DEMETER) satellite over a period of 6 years (2005–2010), in order to investigate the correlation betweenseismic activity and equatorial plasma density variations. To simplify the analysis, three equatorial regionswith frequent earthquakes were selected and then one-dimensional time series analysis between thedaily seismic activity indices and the equatorial ionization anomaly (EIA) intensity indices, which representrelative equatorial electron density increase, were performed for each region. The statistically significantvalues of the lagged cross-correlation function, particularly in the region with minimal effects oflongitudinal asymmetry, indicate that some of the very large earthquakes with M > 5.0 in the low-latituderegion can accompany observable precursory and concurrent EIA enhancements, even though the seismicactivity is not the most significant driver of the equatorial ionospheric evolution. The physical mechanismsof the seismo-ionospheric coupling is consistent with our observation, and the possibility of earthquakeprediction using the EIA intensity variation is discussed

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Section: Satellite Observations and Data Processingmentioning

confidence: 99%

Section: Satellite Observations and Data Processingmentioning

confidence: 99%

Seismo‐ionospheric coupling appearing as equatorial electron density enhancements observed via DEMETER electron density measurements

et al. 2014

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“…In local daytime around 9:30 -10:30, under the heating action from the Sun and tidal movement from the atmosphere, the electrons and ions at the lower ionosphere move upwards and across the horizontal geomagnetic power lines around the equator to interact with the geomagnetic field, resulting in the equatorial ionospheric anomaly (EIA). At the altitude of DEMETER and DMSP, double peaks at ±20° converge to one single peak (Zhang 2014) around the equator. After the upward movement, the zonal wind will play a role to determine the spatial distribution of ions.…”

Section: Discussionmentioning

confidence: 99%

“…The disappearance of peak H + in June over southern hemisphere is the biggest difference with two other ion species. Some scientists have studied the asymmetry features in Ne and Ni by using satellite observations (Mendillo et al 2005;Liu et al 2007;Zhang et al 2014Zhang et al , 2015, and all solstitial AI (Asymmetry Index,…”

Section: Discussionmentioning

confidence: 99%

The spatial distribution of hydrogen ions at topside ionosphere in local daytime

Shen¹,

Zhang²

2017

Terr. Atmos. Ocean. Sci.

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Using DEMETER and DMSP satellite data, the spatial distribution of hydrogen ion (H + ) in local daytime has been compared and analyzed. At 840 km of DMSP height, the seasonal variations of H + density is basically symmetric, with similar density values near to the magnetic equator at northern hemisphere in December and at southern hemisphere in June. But at DEMETER satellite height, the peak H + density shows obvious enhancement at northern hemisphere in December solstice, while with approximate small values at both hemispheres in June. This spatial distribution feature is totally different with other ions such as O + and He + at the topside ionosphere. And also it influences the transition height in topside ionosphere, with lower transition height over northern hemisphere in December season at 10 -20°N than those at equator and over southern hemisphere in June season. The solstitial asymmetry index (AI) of H + at 670 km altitude gives the significant December season enhancement over northern hemisphere, which is typically reversed with electron density (Ne) and ion density (Ni) with large numbers over southern hemisphere in December season. Finally combining with the distribution of H atoms and neutral wind velocity in upper atmosphere, the forming mechanism and asymmetry feature of peak H + density is discussed. It is illustrated that the upwelling movement at equatorial area and northward neutral wind play important roles in H + peak drift in December season at DEMETER satellite altitude below the transition height where H + is not the main composition in the local daytime in solar minimum years. Keywords:Hydrogen ion, Topside ionosphere, Seasonal asymmetry, DEMETER satellite Citation:Shen, X. and X. Zhang, 2017: The spatial distribution of hydrogen ions at topside ionosphere in local daytime.

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“…Based on the DEMETER satellite observations, Zhang et al [33,34] studied the solar cycle variations in the electron density in the topside ionosphere (660-710 km) during low solar activity years in 2005-2010, in which the electron density Ne reduced by more than 50 % in 3 years, from 2006 to 2008, at the equatorial and middle latitudes. Zhang [35] revealed the overestimation of Ne by the IRI model. There is only an equatorial peak structure in Ne at 660 km during solar minimum, not the double-crest structure predicted in the IRI model.…”

Section: Ionospheric Climatology and Structuresmentioning

confidence: 99%

New understanding achieved from 2 years of Chinese ionospheric investigations

Liu

Wan

2016

Science Bulletin

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Electron Density Comparison Between IRI 2007 and DEMETER Satellite Data in Solar Minimum Year

Abstract: ABSTRACT

Cited by 10 publications

References 39 publications

Seismo‐ionospheric coupling appearing as equatorial electron density enhancements observed via DEMETER electron density measurements

Seismo‐ionospheric coupling appearing as equatorial electron density enhancements observed via DEMETER electron density measurements

The spatial distribution of hydrogen ions at topside ionosphere in local daytime

New understanding achieved from 2 years of Chinese ionospheric investigations

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