Assessing the Performance of EUHFORIA Modeling the Background Solar Wind

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http://hdl.handle.net/10138/312034

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Hinterreiter , J , Magdalenic , J , Temmer , M , Verbeke , C , Jebaraj , I C , Samara , E , Asvestari , E , Poedts , S , Pomoell , J , Kilpua , E , Rodriguez , L , Scolini , C & Isavnin , A 2019 , ' Assessing the Performance of EUHFORIA Modeling the Background Solar Wind ' , Solar Physics , vol. 294 , no. 12 , 170 . https://doi.org/10.1007/s11207-019-1558-8

Title: Assessing the Performance of EUHFORIA Modeling the Background Solar Wind
Author: Hinterreiter, Jurgen; Magdalenic, Jasmina; Temmer, Manuela; Verbeke, Christine; Jebaraj, Immanuel Christopher; Samara, Evangelia; Asvestari, Eleanna; Poedts, Stefaan; Pomoell, Jens; Kilpua, Emilia; Rodriguez, Luciano; Scolini, Camilla; Isavnin, Alexey
Contributor: University of Helsinki, Space Physics Research Group
University of Helsinki, Department of Physics
University of Helsinki, Space Physics Research Group
Date: 2019-12-05
Language: eng
Number of pages: 19
Belongs to series: Solar Physics
ISSN: 0038-0938
URI: http://hdl.handle.net/10138/312034
Abstract: In order to address the growing need for more accurate space-weather predictions, a new model named EUHFORIA (EUropean Heliospheric FORecasting Information Asset) was recently developed. We present the first results of the performance assessment for the solar-wind modeling with EUHFORIA and identify possible limitations of its present setup. Using the basic EUHFORIA 1.0.4 model setup with the default input parameters, we modeled background solar wind (no coronal mass ejections) and compared the obtained results with Advanced Composition Explorer (ACE) in-situ measurements. For the purposes of statistical study we developed a technique of combining daily EUHFORIA runs into continuous time series. The combined time series were derived for the years 2008 (low solar activity) and 2012 (high solar activity), from which in-situ speed and density profiles were extracted. We find for the low-activity phase a better match between model results and observations compared to the high-activity time interval considered. The quality of the modeled solar-wind parameters is found to be rather variable. Therefore, to better understand the results obtained we also qualitatively inspected characteristics of coronal holes, i.e. the sources of the studied fast streams. We discuss how different characteristics of the coronal holes and input parameters to EUHFORIA influence the modeled fast solar wind, and suggest possibilities for the improvement of the model.
Subject: 115 Astronomy, Space science
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