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Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration
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| Zeitschriftentitel: | Journal of Geophysical Research: Space Physics |
|---|---|
| Personen und Körperschaften: | , , , , , |
| In: | Journal of Geophysical Research: Space Physics, 117, 2012, A3 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
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| Schlagwörter: |
| author_facet |
Karlsson, T. Brenning, N. Nilsson, H. Trotignon, J.‐G. Vallières, X. Facsko, G. Karlsson, T. Brenning, N. Nilsson, H. Trotignon, J.‐G. Vallières, X. Facsko, G. |
|---|---|
| author |
Karlsson, T. Brenning, N. Nilsson, H. Trotignon, J.‐G. Vallières, X. Facsko, G. |
| spellingShingle |
Karlsson, T. Brenning, N. Nilsson, H. Trotignon, J.‐G. Vallières, X. Facsko, G. Journal of Geophysical Research: Space Physics Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| author_sort |
karlsson, t. |
| spelling |
Karlsson, T. Brenning, N. Nilsson, H. Trotignon, J.‐G. Vallières, X. Facsko, G. 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2011ja017059 <jats:p>We use Cluster multipoint density measurements, using the spacecraft potential, to identify localized density enhancements (>50%) in the magnetosheath, and estimate their three‐dimensional morphology and orientation. Typically one dimension of the density enhancements is shorter than others, is directed perpendicular to the background magnetic field, and varies from ∼0.1 R<jats:sub>E</jats:sub> to 10 R<jats:sub>E</jats:sub>, with the other two dimensions a factor 3–10 greater. The density structures are oriented with the longest sides in the general direction of the bow shock and magnetopause. Examples of density structures both convecting with the same velocity as the background magnetosheath flow (“embedded plasmoids”), and convecting with an excess <jats:italic>x</jats:italic><jats:sub>GSE</jats:sub> velocity component (“fast plasmoids”) are found. Possible importance for the impulsive penetration mechanism for plasma entry in the magnetosphere is analyzed by comparing the results to laboratory results, via a parameter scaling. The estimation of the three‐dimensional topology of the density enhancements will enable a comparison with localized magnetosheath populations inside the magnetosphere, observed earlier, to determine if these originate from penetrated magnetosheath density enhancements.</jats:p> Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration Journal of Geophysical Research: Space Physics |
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10.1029/2011ja017059 |
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Allgemeine Naturwissenschaft Physik Technik Geologie und Paläontologie Geographie Chemie und Pharmazie Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft Biologie |
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| title |
Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration |
| title_unstemmed |
Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration |
| title_full |
Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration |
| title_fullStr |
Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration |
| title_full_unstemmed |
Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration |
| title_short |
Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration |
| title_sort |
localized density enhancements in the magnetosheath: three‐dimensional morphology and possible importance for impulsive penetration |
| topic |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| url |
http://dx.doi.org/10.1029/2011ja017059 |
| publishDate |
2012 |
| physical |
|
| description |
<jats:p>We use Cluster multipoint density measurements, using the spacecraft potential, to identify localized density enhancements (>50%) in the magnetosheath, and estimate their three‐dimensional morphology and orientation. Typically one dimension of the density enhancements is shorter than others, is directed perpendicular to the background magnetic field, and varies from ∼0.1 R<jats:sub>E</jats:sub> to 10 R<jats:sub>E</jats:sub>, with the other two dimensions a factor 3–10 greater. The density structures are oriented with the longest sides in the general direction of the bow shock and magnetopause. Examples of density structures both convecting with the same velocity as the background magnetosheath flow (“embedded plasmoids”), and convecting with an excess <jats:italic>x</jats:italic><jats:sub>GSE</jats:sub> velocity component (“fast plasmoids”) are found. Possible importance for the impulsive penetration mechanism for plasma entry in the magnetosphere is analyzed by comparing the results to laboratory results, via a parameter scaling. The estimation of the three‐dimensional topology of the density enhancements will enable a comparison with localized magnetosheath populations inside the magnetosphere, observed earlier, to determine if these originate from penetrated magnetosheath density enhancements.</jats:p> |
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| author | Karlsson, T., Brenning, N., Nilsson, H., Trotignon, J.‐G., Vallières, X., Facsko, G. |
| author_facet | Karlsson, T., Brenning, N., Nilsson, H., Trotignon, J.‐G., Vallières, X., Facsko, G., Karlsson, T., Brenning, N., Nilsson, H., Trotignon, J.‐G., Vallières, X., Facsko, G. |
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| description | <jats:p>We use Cluster multipoint density measurements, using the spacecraft potential, to identify localized density enhancements (>50%) in the magnetosheath, and estimate their three‐dimensional morphology and orientation. Typically one dimension of the density enhancements is shorter than others, is directed perpendicular to the background magnetic field, and varies from ∼0.1 R<jats:sub>E</jats:sub> to 10 R<jats:sub>E</jats:sub>, with the other two dimensions a factor 3–10 greater. The density structures are oriented with the longest sides in the general direction of the bow shock and magnetopause. Examples of density structures both convecting with the same velocity as the background magnetosheath flow (“embedded plasmoids”), and convecting with an excess <jats:italic>x</jats:italic><jats:sub>GSE</jats:sub> velocity component (“fast plasmoids”) are found. Possible importance for the impulsive penetration mechanism for plasma entry in the magnetosphere is analyzed by comparing the results to laboratory results, via a parameter scaling. The estimation of the three‐dimensional topology of the density enhancements will enable a comparison with localized magnetosheath populations inside the magnetosphere, observed earlier, to determine if these originate from penetrated magnetosheath density enhancements.</jats:p> |
| doi_str_mv | 10.1029/2011ja017059 |
| facet_avail | Online, Free |
| finc_class_facet | Allgemeine Naturwissenschaft, Physik, Technik, Geologie und Paläontologie, Geographie, Chemie und Pharmazie, Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft, Biologie |
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| imprint | American Geophysical Union (AGU), 2012 |
| imprint_str_mv | American Geophysical Union (AGU), 2012 |
| institution | DE-Ch1, DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14 |
| issn | 0148-0227 |
| issn_str_mv | 0148-0227 |
| language | English |
| last_indexed | 2024-03-01T17:57:28.264Z |
| match_str | karlsson2012localizeddensityenhancementsinthemagnetosheaththreedimensionalmorphologyandpossibleimportanceforimpulsivepenetration |
| mega_collection | American Geophysical Union (AGU) (CrossRef) |
| physical | |
| publishDate | 2012 |
| publishDateSort | 2012 |
| publisher | American Geophysical Union (AGU) |
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| spelling | Karlsson, T. Brenning, N. Nilsson, H. Trotignon, J.‐G. Vallières, X. Facsko, G. 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2011ja017059 <jats:p>We use Cluster multipoint density measurements, using the spacecraft potential, to identify localized density enhancements (>50%) in the magnetosheath, and estimate their three‐dimensional morphology and orientation. Typically one dimension of the density enhancements is shorter than others, is directed perpendicular to the background magnetic field, and varies from ∼0.1 R<jats:sub>E</jats:sub> to 10 R<jats:sub>E</jats:sub>, with the other two dimensions a factor 3–10 greater. The density structures are oriented with the longest sides in the general direction of the bow shock and magnetopause. Examples of density structures both convecting with the same velocity as the background magnetosheath flow (“embedded plasmoids”), and convecting with an excess <jats:italic>x</jats:italic><jats:sub>GSE</jats:sub> velocity component (“fast plasmoids”) are found. Possible importance for the impulsive penetration mechanism for plasma entry in the magnetosphere is analyzed by comparing the results to laboratory results, via a parameter scaling. The estimation of the three‐dimensional topology of the density enhancements will enable a comparison with localized magnetosheath populations inside the magnetosphere, observed earlier, to determine if these originate from penetrated magnetosheath density enhancements.</jats:p> Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration Journal of Geophysical Research: Space Physics |
| spellingShingle | Karlsson, T., Brenning, N., Nilsson, H., Trotignon, J.‐G., Vallières, X., Facsko, G., Journal of Geophysical Research: Space Physics, Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration, Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| title | Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration |
| title_full | Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration |
| title_fullStr | Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration |
| title_full_unstemmed | Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration |
| title_short | Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration |
| title_sort | localized density enhancements in the magnetosheath: three‐dimensional morphology and possible importance for impulsive penetration |
| title_unstemmed | Localized density enhancements in the magnetosheath: Three‐dimensional morphology and possible importance for impulsive penetration |
| topic | Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| url | http://dx.doi.org/10.1029/2011ja017059 |