Evaluation and correction of the IRI2016 topside ionospheric electron density model

Sicheng, Wang; Huang, Shucai; Fang, Hanxian; Wang, Yu

doi:10.1016/j.asr.2016.06.020

Cited by 8 publications

(5 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…IRI's performance in comparison to ionosphere state derived from GNSS, LEO satellites, incoherent scatter radars, etc. is an object of study since its very beginning, in great details, amongst many others, described by [37][38][39], proving its qualities and helping the IRI becoming the internationally recommended empirical model. Among other changes, the most recent IRI-2016 [6] introduced two new models for the F2 peak electron density height, hmF2, and improvements of the ion composition at low and high solar activity.…”

Section: Iri and Data Assimilationmentioning

confidence: 99%

Towards Cooperative Global Mapping of the Ionosphere: Fusion Feasibility for IGS and IRI with Global Climate VTEC Maps

et al. 2020

View full text Add to dashboard Cite

Recommendations of the International Reference Ionosphere (IRI) Workshop 2017 in Taoyuan City, Taiwan and International GNSS Service (IGS) Workshop 2018 in Wuhan, China included establishment of an ionosphere mapping service that would fuse measurements from two independent sensor networks: IGS permanent GNSS receivers providing the vertical total electron content (VTEC) measurements and ionosondes of the Global Ionosphere Radio Observatory (GIRO) that compute the bottomside vertical profiles of the ionospheric plasma density. Using available GAMBIT software at GIRO, we introduced new VTEC products to its data roster: previously unavailable global average (climate) maps of VTEC and slab thickness based on climatological capabilities of IRI. Incorporation of the VTEC and maps into the GAMBIT Explorer environment provided data analysts with nearly 10-year history of the reference average VTEC records and opened access to the GAMBIT toolkit for evaluation and validation of the computations. This result is the first step towards establishing an infrastructure and the data workflow to provide GAMBIT users with the low latency and consistent quality and usability of the ionospheric weather-climate specifications. Combination of IGS-provided VTEC and GIRO-provided peak density of F2 layer NmF2 allows ground-based evaluation of the equivalent slab thickness , a derived property of the near-Earth plasma that characterizes the skewness of its vertical profile up to the GNSS spacecraft altitudes.

show abstract

Section: Iri and Data Assimilationmentioning

confidence: 99%

Towards Cooperative Global Mapping of the Ionosphere: Fusion Feasibility for IGS and IRI with Global Climate VTEC Maps

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Large changes in solar radiation and geomagnetic activity affect the production of free electrons in the ionosphere (60-2000 km) (Baron et al, 1983;Forbes et al, 2000;Rishbeth & Mendillo, 2001), leading to significant impacts on, for example, civil radio communication (Kutiev et al, 2012;Wells, 1943) and satellite orbital stability (Walterscheid, 1989). Solar-induced variations in the ionospheric electron density have been monitored routinely (Afraimovich et al, 2008;Appleton & Naismith, 1940;Baron et al, 1983;Bartels, 1950;Handzo et al, 2014;Huang et al, 2015;Lei et al, 2008;Liang et al, 2008;Ma et al, 2012;Munro, 1962;Pedatella et al, 2010) and incorporated in ionospheric models for space weather forecasts (Bilitza et al, 2011;Hochegger et al, 2000;Jakowski et al, 2011;Scherliess et al, 2004;Wang et al, 2016;Yue et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

The 11 Year Solar Cycle Response of the Equatorial Ionization Anomaly Observed by GPS Radio Occultation

Lin

Bui

et al. 2018

JGR Space Physics

View full text Add to dashboard Cite

We have retrieved the latitudinal and vertical structures of the 11 year solar cycle modulation on ionospheric electron density using 14 years of satellite‐based radio occultation measurements utilizing the Global Positioning System. The densities at the crests of the equatorial ionization anomaly (EIA) in the subtropics near 300 km in 2003 and 2014 (high solar activity with solar 10.7 cm flux, F10.7 ≈ 140 solar flux unit (sfu)) were 3 times higher than that in 2009 (low solar activity F10.7 ≈ 70 sfu). The higher density is attributed to the elevated solar extreme ultraviolet and geomagnetic activity during high solar activity periods. The location of the EIA crests moved ~50 km upward and ~10° poleward, because of the enhanced E × B force. The EIA in the northern hemisphere was more pronounced than that in the southern hemisphere. This interhemispheric asymmetry is consistent with the effect of enhanced transequatorial neutral wind. The above observations were reproduced qualitatively by the two benchmark runs of the Thermosphere‐Ionosphere‐Electrodynamics General Circulation Model. In addition, we have studied the impact of the 11 year solar cycle on the 27 day solar cycle response of the ionospheric electron density. Beside the expected modulation on the amplitude of the 27 day solar variation due to the 11 year solar cycle, we find that the altitude of the maximal 27 day solar response is unexpectedly ~50 km higher than that of the 11 year solar response. This is the first time that a vertical dependence of the solar responses on different time scales is reported.

show abstract

“…(2013) with topside ionospheric densities over Africa measured by the Communications/Navigation Outage Forecasting System (C/NOFS) satellite, by Wang et al. (2016) with Arecibo, Jicamarca, and Millstone Hill ISR observations from 2001 to 2014, and by Pignalberi et al. (2016) who analyzed the behavior of the IRI topside options during the St. Patrick storm that occurred in March 2015.…”

Section: Electron Density and Vertical Total Electron Contentmentioning

confidence: 99%

The International Reference Ionosphere Model: A Review and Description of an Ionospheric Benchmark

Bilitza

Pezzopane

Truhlík

et al. 2022

Reviews of Geophysics

143

View full text Add to dashboard Cite

The terrestrial ionosphere is a plasma, that is, an ionized gas consisting of free electrons and ions. It is part of the Earth's atmosphere and is produced by solar radiation ionizing the neutral gas constituents. Only a small fraction of the neutral atmosphere is ionized. Typical ratios of electron to neutral gas density are 10 −2 at the top of the ionosphere (at a height of about 1,000 km), 10 −3 at the height of the ionospheric absolute electron density maximum (located roughly between 200 and 450 km of height), and 10 −8 at the bottom of the ionosphere (at a height of about 100 km). These limits mark the altitude boundaries of the ionosphere but they must not be considered fixed. They are highly variable in both space and time, in particular this is the case for the upper limit which marks the separation between the ionosphere below it and the plasmasphere above it (

show abstract

Evaluation and correction of the IRI2016 topside ionospheric electron density model

Cited by 8 publications

References 28 publications

Towards Cooperative Global Mapping of the Ionosphere: Fusion Feasibility for IGS and IRI with Global Climate VTEC Maps

Towards Cooperative Global Mapping of the Ionosphere: Fusion Feasibility for IGS and IRI with Global Climate VTEC Maps

The 11 Year Solar Cycle Response of the Equatorial Ionization Anomaly Observed by GPS Radio Occultation

The International Reference Ionosphere Model: A Review and Description of an Ionospheric Benchmark

Contact Info

Product

Resources

About