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  Statistical estimates of auroral Pedersen conductance using electric and magnetic measurements by the Swarm spacecraft

Vanhamaki, H., Aikio, A., Kauristie, K., Käki, S., Knudsen, D. (2023): Statistical estimates of auroral Pedersen conductance using electric and magnetic measurements by the Swarm spacecraft, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2271

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018493 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018493_2
Genre: Conference Paper

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 Creators:
Vanhamaki, Heikki1, Author
Aikio, Anita1, Author
Kauristie, Kirsti1, Author
Käki, Sebastian1, Author
Knudsen, David1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: The height-integrated ionospheric Pedersen conductance is a crucial parameter in estimating ionospheric Joule heating, which in turn has a large impact on the thermospheric chemical composition and circulation during periods of increased geomagnetic activity. As the conductance is difficult to measure directly in extended regions, statistical models and proxies are often used. We estimate the Pedersen conductance using magnetic and electric field data provided by the Swarm satellites. Two assumptions are needed in the analysis. 1) The height-integrated Pedersen current is identical to the curl-free part of the height integrated ionospheric horizontal current. This is not usually valid in individual cases, but it should be a reasonable approximation in a statistical sense. 2) The cross-track magnetic disturbance measured by Swarm is mostly produced by field-aligned currents and not affected by ionospheric electrojets. When both assumptions are satisfied, the height-integrated Pedersen conductance can be directly estimated from the ion velocity and the magnetic perturbation. The result is valid both in the case of quasi-static MI-coupling and idealized Alfven wave reflection at the ionospheric boundary. We present results of a statistical study utilizing 9 years of data from the Swarm-A and Swarm-B satellites. Careful selection and filtering of the data are required, which tends to limit the analysis to regions where the ion velocity and magnetic disturbances are reasonably strong, i.e. close to the auroral ovals. Statistical Pedersen conductance maps are derived for the Northern and Southern auroral regions during different seasons and levels of geomagnetic activity.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-2271
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -