Sökning: id:"swepub:oai:DiVA.org:uu-390790" >
GUMICS-4 analysis o...
GUMICS-4 analysis of interplanetary coronal mass ejection impact on Earth during low and typical Mach number solar winds
-
- Lakka, Antti (författare)
- Aalto Univ, Dept Elect & Nanoengn, Espoo, Finland
-
- Pulkkinen, Tuija I. (författare)
- Aalto Univ, Dept Elect & Nanoengn, Espoo, Finland;Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA
-
- Dimmock, Andrew P. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
visa fler...
-
- Kilpua, Emilia (författare)
- Univ Helsinki, Dept Phys, Helsinki, Finland
-
- Ala-Lahti, Matti (författare)
- Univ Helsinki, Dept Phys, Helsinki, Finland
-
- Honkonen, Ilja (författare)
- Finnish Meteorol Inst, Helsinki, Finland
-
- Palmroth, Minna (författare)
- Univ Helsinki, Dept Phys, Helsinki, Finland
-
- Raukunen, Osku (författare)
- Univ Turku, Dept Phys & Astron, Turku, Finland
-
visa färre...
-
(creator_code:org_t)
- 2019-07-11
- 2019
- Engelska.
-
Ingår i: Annales Geophysicae. - : COPERNICUS GESELLSCHAFT MBH. - 0992-7689 .- 1432-0576. ; 37:4, s. 561-579
- Relaterad länk:
-
https://doi.org/10.5...
-
visa fler...
-
https://uu.diva-port... (primary) (Raw object)
-
https://angeo.copern...
-
https://urn.kb.se/re...
-
https://doi.org/10.5...
-
visa färre...
Abstract
Ämnesord
Stäng
- We study the response of the Earth's magnetosphere to fluctuating solar wind conditions during interplanetary coronal mass ejections (ICMEs) using the Grand Unified Magnetosphere-Ionosphere Coupling Simulation (GUMICS-4). The two ICME events occurred on 15-16 July 2012 and 29-30 April 2014. During the strong 2012 event, the solar wind upstream values reached up to 35 particles cm(-3), speeds of up to 694 km s(-1), and an interplanetary magnetic field of up to 22 nT, giving a Mach number of 2.3. The 2014 event was a moderate one, with the corresponding upstream values of 30 particles cm(-3), 320 km s(-1) and 10 nT, indicating a Mach number of 5.8. We examine how the Earth's space environment dynamics evolves during both ICME events from both global and local perspectives, using well-established empirical models and in situ measurements as references. We show that on the large scale, and during moderate driving, the GUMICS-4 results are in good agreement with the reference values. However, the local values, especially during high driving, show more variation: such extreme conditions do not reproduce local measurements made deep inside the magnetosphere. The same appeared to be true when the event was run with another global simulation. The cross-polar cap potential (CPCP) saturation is shown to depend on the Alfven-Mach number of the upstream solar wind. However, care must be taken in interpreting these results, as the CPCP is also sensitive to the simulation resolution.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas