Evaluation of the Empirical Scaling Factor of Joule Heating Rates in TIE‐GCM With EISCAT Measurements

DOI DOI Web Site 研究データあり 参考文献42件 オープンアクセス
  • Florian Günzkofer
    Institute for Solar‐Terrestrial Physics German Aerospace Center (DLR) Neustrelitz Germany
  • Huixin Liu
    Department of Earth and Planetary Sciences Kyushu University Fukuoka Japan
  • Gunter Stober
    Institute of Applied Physics & Oeschger Center for Climate Change Research Microwave Physics University of Bern Bern Switzerland
  • Dimitry Pokhotelov
    Institute of Physics University of Greifswald Greifswald Germany
  • Claudia Borries
    Institute for Solar‐Terrestrial Physics German Aerospace Center (DLR) Neustrelitz Germany

書誌事項

公開日
2024-03-27
資源種別
journal article
権利情報
  • http://creativecommons.org/licenses/by-nc-nd/4.0/
DOI
  • 10.1029/2023ea003447
  • 10.22541/essoar.170144028.85496334/v1
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>Joule heating is one of the main energy inputs into the thermosphere‐ionosphere system. Precise modeling of this process is essential for any space weather application. Existing thermosphere‐ionosphere models tend to underestimate the actual Joule heating rate quite significantly. The Thermosphere‐Ionosphere‐Electrodynamics General‐Circulation‐Model applies an empirical scaling factor of 1.5 for compensation. We calculate vertical profiles of Joule heating rates from approximately 2,220 hr of measurements with the EISCAT incoherent scatter radar and the corresponding model runs. We investigate model runs with the plasma convection driven by both the <jats:italic>Heelis</jats:italic> and the <jats:italic>Weimer</jats:italic> model. The required scaling of the Joule heating profiles is determined with respect to the <jats:italic>Kp</jats:italic> index, the Kan‐Lee merging electric field <jats:italic>E</jats:italic><jats:sub><jats:italic>KL</jats:italic></jats:sub>, and the magnetic local time. Though the default scaling factor of 1.5 appears to be adequate on average, we find that the required scaling varies strongly with all three parameters ranging from 0.46 to ∼20 at geomagnetically disturbed and quiet times, respectively. Furthermore, the required scaling is significantly different in runs driven by the <jats:italic>Heelis</jats:italic> and <jats:italic>Weimer</jats:italic> model. Adjusting the scaling factor with respect to the <jats:italic>Kp</jats:italic> index, <jats:italic>E</jats:italic><jats:sub><jats:italic>KL</jats:italic></jats:sub>, the magnetic local time, and the choice of convection model would reduce the difference between Joule heating rates calculated from measurement and model plasma parameters.</jats:p>

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