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

Hernández‐Pajares, Manuel; García-Fernández, Miquel; Rius, A.; Notarpietro, Riccardo; Engeln, Axel von; Olivares‐Pulido, Germán; Aragón‐Àngel, Àngela; Rigo, Alberto Garcıa

doi:10.1002/2017ja023876

Cited by 33 publications

(38 citation statements)

References 38 publications

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“…Also, our results are supported by the need in increase of the electron density scale height above F2‐layer peak recently confirmed with direct radio occultation GPS measurements (Hernández‐Pajares et al, ; Olivares‐Pulido et al, ).…”

Section: Resultssupporting

confidence: 88%

Coincident Observations by the Kharkiv IS Radar and Ionosonde, DMSP and Arase (ERG) Satellites, and FLIP Model Simulations: Implications for the NRLMSISE‐00 Hydrogen Density, Plasmasphere, and Ionosphere

Kotov

Richards

Truhlík

et al. 2018

Geophysical Research Letters

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This paper reports the results of ionosphere and plasmasphere observations with the Kharkiv incoherent scatter radar and ionosonde, Defense Meteorological Satellite Program, and Arase (ERG) satellites and simulations with field line interhemispheric plasma model during the equinoxes and solstices of solar minimum 24. The results reveal the need to increase NRLMSISE‐00 thermospheric hydrogen density by a factor of ~2. For the first time, it is shown that the measured plasmaspheric density can be reproduced with doubled NRLMSISE‐00 hydrogen density only. A factor of ~2 decrease of plasmaspheric density in deep inner magnetosphere (L ≈ 2.1) caused by very weak magnetic disturbance (Dst > −22 nT) of 24 December 2017 was observed in the morning of 25 December 2017. During the next night, prominent effects of partially depleted flux tube were observed in the topside ionosphere (~50% reduced H+ ion density) and at the F2‐layer peak (~50% decreased electron density). The likely physical mechanisms are discussed.

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Section: Resultssupporting

confidence: 88%

Coincident Observations by the Kharkiv IS Radar and Ionosonde, DMSP and Arase (ERG) Satellites, and FLIP Model Simulations: Implications for the NRLMSISE‐00 Hydrogen Density, Plasmasphere, and Ionosphere

Kotov

Richards

Truhlík

et al. 2018

Geophysical Research Letters

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“…The comparison between electron density values measured by COSMIC and those modeled by using H Linear testifies that it is possible to accurately reproduce the ionospheric topside electron density profile by using a semi-Epstein layer with a scale height linearly dependent on height, at least from hmF2 to about 800 km of height. This largely agrees with previous works using a Chapman function with height-varying scale height [2], [38]- [40].…”

Section: B Calculation Of the Topside Scale Height Through Cosmic/fosupporting

confidence: 92%

On the Analytical Description of the Topside Ionosphere by NeQuick: Modeling the Scale Height Through COSMIC/FORMOSAT-3 Selected Data

Pignalberi

Pezzopane

Themens

et al. 2020

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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The analytical description of the topside ionosphere included in the NeQuick model is studied in detail. First, the modeled scale height behavior is analyzed at infinity and for the lowest part of the topside region; in the latter case, the analysis is done through an expansion in Taylor series near the F2-layer peak. Moreover, the significant influence of the three NeQuick topside parameters in the modeling of the topside profile is investigated in detail and, in particular, it is shown that for the lowest part of the topside the model assumes a linearly increasing trend of the topside scale height. Second, the topside formulation is inverted to derive a fully analytical expression of the topside scale height as a function of the electron density and F2-layer peak parameters. This expression has been applied to a selected and very reliable dataset of Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC)/FORMOSAT-3 radio occultation profiles. Statistical analyses strongly support the hypothesis embedded in NeQuick regarding the linear trend of the topside scale height for the lowest part of the topside. Index Terms-Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC)/FORMOSAT-3 radio occultation data, NeQuick model, topside ionosphere modeling, topside scale height. I. INTRODUCTION T HE topside part of the ionosphere extends from the height of the F2-layer peak, corresponding to the ionospheric electron density maximum (NmF2), to the plasmasphere [1]. Developing a reliable model of the topside ionosphere is one of the most difficult tasks because instruments commonly used

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“…In Liu et al () a 5% of questionable profiles have been identified; in Brunini et al, (), about 20% points have been eliminated after applying a quality filter. More recently, the importance of having selection criteria to eliminate doubtful profiles has been underlined by Uma et al, () and an example of a specific filtering procedure has been suggested by Hernández‐Pajares et al ().…”

Section: Introductionmentioning

confidence: 99%

On the Use of Topside RO‐Derived Electron Density for Model Validation

2018

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In this work, the standard Abel inversion has been exploited as a powerful observation tool, which may be helpful to model the topside of the ionosphere and therefore to validate ionospheric models. A thorough investigation on the behavior of radio occultation (RO)-derived topside electron density (Ne(h))-profiles has therefore been performed with the main purpose to understand whether it is possible to predict the accuracy of a single RO-retrieved topside by comparing the peak density and height of the retrieved profile to the true values. As a first step, a simulation study based on the use of the NeQuick2 model has been performed to show that when the RO-derived electron density peak and height match the true peak values, the full topside Ne(h)-profile may be considered accurate. In order to validate this hypothesis with experimental data, electron density profiles obtained from four different incoherent scatter radars have therefore been considered together with co-located RO-derived Ne(h)-profiles. The evidence presented in this paper show that in all cases examined, if the incoherent scatter radar and the corresponding co-located RO profile have matching peak parameter values, their topsides are in very good agreement. The simulation results presented in this work also highlighted the importance of considering the occultation plane azimuth while inverting RO data to obtain Ne(h)-profile. In particular, they have indicated that there is a preferred range of azimuths of the occultation plane (80°-100°) for which the difference between the "true" and the RO-retrieved Ne(h)-profile in the topside is generally minimal.

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

Cited by 33 publications

References 38 publications

Coincident Observations by the Kharkiv IS Radar and Ionosonde, DMSP and Arase (ERG) Satellites, and FLIP Model Simulations: Implications for the NRLMSISE‐00 Hydrogen Density, Plasmasphere, and Ionosphere

Coincident Observations by the Kharkiv IS Radar and Ionosonde, DMSP and Arase (ERG) Satellites, and FLIP Model Simulations: Implications for the NRLMSISE‐00 Hydrogen Density, Plasmasphere, and Ionosphere

On the Analytical Description of the Topside Ionosphere by NeQuick: Modeling the Scale Height Through COSMIC/FORMOSAT-3 Selected Data

On the Use of Topside RO‐Derived Electron Density for Model Validation

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