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Role of eddy diffusion in the delayed ionospheric response to solar flux changes

Vaishnav, Rajesh and Jacobi, Christoph and Berdermann, Jens and Codrescu, Mihail and Schmölter, Erik (2021) Role of eddy diffusion in the delayed ionospheric response to solar flux changes. Annales Geophysicae, 39 (4), pp. 641-655. Copernicus Publications. doi: 10.5194/angeo-39-641-2021. ISSN 0992-7689.

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Official URL: https://angeo.copernicus.org/articles/39/641/2021/angeo-39-641-2021.html


Simulations of the ionospheric response to solar flux changes driven by the 27 d solar rotation have been performed using the global 3-D Coupled Thermosphere Ionosphere Plasmasphere electrodynamics (CTIPe) physics-based numerical model. Using the F10.7 index as a proxy for solar extreme ultraviolet (EUV) variations in the model, the ionospheric delay at the solar rotation period is well reproduced and amounts to about 1 d, which is consistent with satellite and in situ measurements. From mechanistic CTIPe studies with reduced and increased eddy diffusion, we conclude that the eddy diffusion is an important factor that influences the delay of the ionospheric total electron content (TEC). We observed that the peak response time of the atomic oxygen to molecular nitrogen ratio to the solar EUV flux changes quickly during the increased eddy diffusion compared with weaker eddy diffusion. These results suggest that an increase in the eddy diffusion leads to faster transport processes and an increased loss rate, resulting in a decrease in the ionospheric time delay. Furthermore, we found that an increase in solar activity leads to an enhanced ionospheric delay. At low latitudes, the influence of solar activity is stronger because EUV radiation drives ionization processes that lead to compositional changes. Therefore, the combined effect of eddy diffusion and solar activity leads to a longer delay in the low-latitude and midlatitude region.

Item URL in elib:https://elib.dlr.de/143214/
Document Type:Article
Title:Role of eddy diffusion in the delayed ionospheric response to solar flux changes
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Vaishnav, RajeshLeipzig Institute for Meteorology, Universität Leipzighttps://orcid.org/0000-0002-3181-0781
Jacobi, ChristophUniversity of Leipzig, Germanyhttps://orcid.org/0000-0002-7878-0110
Berdermann, JensUNSPECIFIEDhttps://orcid.org/0000-0002-3308-4584
Codrescu, MihailSWPC, NOAA, Boulderhttps://orcid.org/0000-0001-7216-9858
Schmölter, ErikUNSPECIFIEDhttps://orcid.org/0000-0002-9284-6489
Date:12 July 2021
Journal or Publication Title:Annales Geophysicae
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 641-655
Publisher:Copernicus Publications
Keywords:Ionosphere, Solar EUV, TEC, Modeling
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Space Weather Impact
Deposited By: Schmölter, Erik
Deposited On:16 Aug 2021 09:40
Last Modified:16 Aug 2021 09:40

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