Real time 3‐D electron density reconstruction over Europe by using TaD profiler

Kutiev, I.; Marinov, Pencho; Belehaki, A.

doi:10.1002/2015rs005932

Cited by 7 publications

(6 citation statements)

References 39 publications

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“…The EDP modeling under the lack of RO data is typically performed by means of the standard Chapman model, defined by the peak height, h m F 2 , the peak electron density N m F 2 , and the scale height H, which is assumed constant in different works and modeling scenarios, such as (1) the topside of the profile: from in situ low-earth orbiting electron density measurements [see Tulasi Ram et al, 2009], from radio-occultation measurements [see Liu et al, 2008] or for combining GPS and ionosonde data in geomagnetic storm scenarios [Zhu et al, 2016]; (2) the ionospheric and plasmaspheric modeling [see González-Casado et al, 2015;Lee et al, 2016;Kutiev et al, 2016]; (3) the Multilayer Chapman model [Alizadeh et al, 2015]; (4) the Ionospheric correction in tropospheric radio-occultation modeling [see Danzer et al, 2015;Zeng et al, 2016].…”

Section: Extrapolation Of Electron Density Profilesmentioning

confidence: 99%

Electron density extrapolation above F2 peak by the linear Vary‐Chap model supporting new Global Navigation Satellite Systems‐LEO occultation missions

et al. 2017

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The new radio‐occultation (RO) instrument on board the future EUMETSAT Polar System‐Second Generation (EPS‐SG) satellites, flying at a height of 820 km, is primarily focusing on neutral atmospheric profiling. It will also provide an opportunity for RO ionospheric sounding, but only below impact heights of 500 km, in order to guarantee a full data gathering of the neutral part. This will leave a gap of 320 km, which impedes the application of the direct inversion techniques to retrieve the electron density profile. To overcome this challenge, we have looked for new ways (accurate and simple) of extrapolating the electron density (also applicable to other low‐Earth orbiting, LEO, missions like CHAMP): a new Vary‐Chap Extrapolation Technique (VCET). VCET is based on the scale height behavior, linearly dependent on the altitude above hmF2. This allows extrapolating the electron density profile for impact heights above its peak height (this is the case for EPS‐SG), up to the satellite orbital height. VCET has been assessed with more than 3700 complete electron density profiles obtained in four representative scenarios of the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) in the United States and the Formosa Satellite Mission 3 (FORMOSAT‐3) in Taiwan, in solar maximum and minimum conditions, and geomagnetically disturbed conditions, by applying an updated Improved Abel Transform Inversion technique to dual‐frequency GPS measurements. It is shown that VCET performs much better than other classical Chapman models, with 60% of occultations showing relative extrapolation errors below 20%, in contrast with conventional Chapman model extrapolation approaches with 10% or less of the profiles with relative error below 20%.

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Section: Extrapolation Of Electron Density Profilesmentioning

confidence: 99%

Electron density extrapolation above F2 peak by the linear Vary‐Chap model supporting new Global Navigation Satellite Systems‐LEO occultation missions

et al. 2017

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“…The TID-induced perturbations in electron density predicted with the TaD model. The Topside Sounder Model (TSM)-assisted Digisonde (TaD) profiler provides vertical electron density profiles (EDP) above Digisonde sounding stations operating in Europe, from the bottom of the ionosphere up to the GNSS orbit altitude (Kutiev et al, 2016). This model is based on the Topside Sounder Model (TSM) proposed by Kutiev et al (2006).…”

Section: Large Scale Tid Detection Methodologiesmentioning

confidence: 99%

“…To obtain the electron density distribution in the bottomside and topside ionosphere over an extended region such as Europe, we apply the 3D version of the TaD model. The 3D mapping technique is described in Kutiev et al (2016). The TaD profiler first computes electron density profiles (EDP) over the European Digisonde locations.…”

Section: Specification Of Ionospheric Background Conditionsmentioning

confidence: 99%

“…The electron density distribution (EDD) between any two points in the space is then obtained by calculating successive ED values with a defined step along the ray path. The model error based on the comparison of 3D EDD model values with vertical TEC (vTEC) and slant TEC (STEC), calculated from individual GNSS receivers, is 10% for STEC and 6% for vTEC (Kutiev et al, 2016). Belehaki et al (2017) showed the sensitivity of the TaD EDD to disturbances in the electron density due to LSTIDs and the model capability to detect the altitude of the maximum perturbation.…”

Section: Specification Of Ionospheric Background Conditionsmentioning

confidence: 99%

“…Electron density reconstruction models can fulfil this need. As an example, the 3D version of the Topside Sounder Model (TSM)-assisted Digisonde (TaD) model is able to track the TID triggered disturbances in the electron density at various heights in the F layer and in the topside ionosphere (Kutiev et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An overview of methodologies for real-time detection, characterisation and tracking of traveling ionospheric disturbances developed in the TechTIDE project

Belehaki

Tsagouri

Altadill

et al. 2020

J. Space Weather Space Clim.

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The main objective of the TechTIDE project (Warning and mitigation Technologies for Travelling Ionospheric Disturbances Effects) is the development of an identification and tracking system for Travelling Ionospheric Disturbances (TIDs) which will issue warnings of electron density perturbations over large world regions. The TechTIDE project has put in operation a real-time warning system that provides the results of complementary TID detection methodologies and many potential drivers to help users assess the risks and develop mitigation techniques tailored to their applications. The TechTIDE methodologies are able to detect in real time activity caused by both large-scale and medium-scale TIDs and characterize background conditions and external drivers, as an additional information required by the users to assess the criticality of the ongoing disturbances in real time. TechTIDE methodologies are based on the exploitation of data collected in real time from Digisondes, Global Navigation Satellite System (GNSS) receivers and Continuous Doppler Sounding System (CDSS) networks. The results are obtained and provided to users in real time. The paper presents the achievements of the project and discusses the challenges faced in the development of the final TechTIDE warning system.

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Multi-instrument detection in Europe of ionospheric disturbances caused by the 15 January 2022 eruption of the Hunga volcano

Verhulst

Altadill

Barta

et al. 2022

Preprint

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The 15 January 2022 eruption of the Hunga volcano provides a unique opportunity to study the reaction of the ionosphere to large explosive events. In particular, this event allows us to study the global propagation of travelling ionospheric disturbances using various instruments. We focus on the detection of the ionospheric disturbances caused by this eruption over Europe, where dense networks of both ionosondes and GNSS receivers are available. This event took place on the day of a geomagnetic storm. We show how data from different instruments and from different observatories can be combined to clearly distinguish the TIDs produced by the eruption from those caused by concurrent geomagnetic activity. The Lamb wave front was detected as the strongest disturbance in the ionosphere, travelling at between 300 and 340 m/s, consistent with the disturbances in the lower atmosphere. By comparing observations obtained from multiple types of instruments, we also show that TIDs produced by various mechanisms are present simultaneously, with different types of waves affecting different physical quantities. This illustrates the importance of analysing data from multiple independent instruments in order to obtain a full picture of an event like this one, as relying on only a single data source might result in some effects going unobserved.

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Real time 3‐D electron density reconstruction over Europe by using TaD profiler

Cited by 7 publications

References 39 publications

Electron density extrapolation above F2 peak by the linear Vary‐Chap model supporting new Global Navigation Satellite Systems‐LEO occultation missions

Electron density extrapolation above F2 peak by the linear Vary‐Chap model supporting new Global Navigation Satellite Systems‐LEO occultation missions

An overview of methodologies for real-time detection, characterisation and tracking of traveling ionospheric disturbances developed in the TechTIDE project

Multi-instrument detection in Europe of ionospheric disturbances caused by the 15 January 2022 eruption of the Hunga volcano

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