Two-spacecraft reconstruction of a magnetic cloud and comparison to its solar source
This paper compares properties of the source region with those inferred from satellite observations near Earth of the magnetic cloud which reached 1 AU on 20 November 2003. We use observations from space missions SOHO and TRACE together with ground-based data to study the magnetic structure of...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2008-10-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/26/3139/2008/angeo-26-3139-2008.pdf |
| _version_ | 1818961884955541504 |
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| author | C. Möstl C. Möstl C. Miklenic C. J. Farrugia M. Temmer M. Temmer A. Veronig A. B. Galvin B. Vršnak H. K. Biernat H. K. Biernat |
| author_facet | C. Möstl C. Möstl C. Miklenic C. J. Farrugia M. Temmer M. Temmer A. Veronig A. B. Galvin B. Vršnak H. K. Biernat H. K. Biernat |
| author_sort | C. Möstl |
| collection | DOAJ |
| description | This paper compares properties of the source region with those inferred from
satellite observations near Earth of the magnetic cloud which reached 1 AU on 20 November 2003.
We use observations from space missions SOHO and TRACE together with ground-based data to study the magnetic
structure of the active region NOAA 10501 containing a highly curved filament,
and determine the reconnection rates and fluxes in an M4 flare on 18 November 2003
which is associated with a fast halo CME. This event has been linked before to the
magnetic cloud on 20 November 2003. We model the near-Earth observations with the
Grad-Shafranov reconstruction technique using a novel approach in which we optimize
the results with two-spacecraft measurements of the solar wind plasma and magnetic field made by ACE and WIND.
The two probes were separated by hundreds of Earth radii. They pass through the axis
of the cloud which is inclined −50 degree to the ecliptic.
The magnetic cloud orientation at 1 AU is consistent with an
encounter with the heliospheric current sheet. We estimate that
50% of its poloidal flux has been lost through reconnection in
interplanetary space. By comparing the flare ribbon flux with the
original cloud fluxes we infer a flux rope formation during the
eruption, though uncertainties are still significant. The
multi-spacecraft Grad-Shafranov method opens new vistas in probing
of the spatial structure of magnetic clouds in STEREO-WIND/ACE
coordinated studies. |
| first_indexed | 2024-12-20T12:20:32Z |
| format | Article |
| id | doaj.art-ff8dad1d177d45128d9338ccdb06593e |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-20T12:20:32Z |
| publishDate | 2008-10-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-ff8dad1d177d45128d9338ccdb06593e2022-12-21T19:41:01ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762008-10-01263139315210.5194/angeo-26-3139-2008Two-spacecraft reconstruction of a magnetic cloud and comparison to its solar sourceC. Möstl0C. Möstl1C. Miklenic2C. J. Farrugia3M. Temmer4M. Temmer5A. Veronig6A. B. Galvin7B. Vršnak8H. K. Biernat9H. K. Biernat10Institute for Physics, University of Graz, Universitätsplatz 5, 8010 Graz, AustriaSpace Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, AustriaInstitute for Physics, University of Graz, Universitätsplatz 5, 8010 Graz, AustriaSpace Science Center and Dept. of Physics, University of New Hampshire, Durham, NH 03824, USASpace Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, AustriaHvar Observatory, Faculty of Geodesy, University of Zagreb, Kačićeva 26, 10000 Zagreb, CroatiaInstitute for Physics, University of Graz, Universitätsplatz 5, 8010 Graz, AustriaSpace Science Center and Dept. of Physics, University of New Hampshire, Durham, NH 03824, USAHvar Observatory, Faculty of Geodesy, University of Zagreb, Kačićeva 26, 10000 Zagreb, CroatiaInstitute for Physics, University of Graz, Universitätsplatz 5, 8010 Graz, AustriaSpace Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, AustriaThis paper compares properties of the source region with those inferred from satellite observations near Earth of the magnetic cloud which reached 1 AU on 20 November 2003. We use observations from space missions SOHO and TRACE together with ground-based data to study the magnetic structure of the active region NOAA 10501 containing a highly curved filament, and determine the reconnection rates and fluxes in an M4 flare on 18 November 2003 which is associated with a fast halo CME. This event has been linked before to the magnetic cloud on 20 November 2003. We model the near-Earth observations with the Grad-Shafranov reconstruction technique using a novel approach in which we optimize the results with two-spacecraft measurements of the solar wind plasma and magnetic field made by ACE and WIND. The two probes were separated by hundreds of Earth radii. They pass through the axis of the cloud which is inclined −50 degree to the ecliptic. The magnetic cloud orientation at 1 AU is consistent with an encounter with the heliospheric current sheet. We estimate that 50% of its poloidal flux has been lost through reconnection in interplanetary space. By comparing the flare ribbon flux with the original cloud fluxes we infer a flux rope formation during the eruption, though uncertainties are still significant. The multi-spacecraft Grad-Shafranov method opens new vistas in probing of the spatial structure of magnetic clouds in STEREO-WIND/ACE coordinated studies.https://www.ann-geophys.net/26/3139/2008/angeo-26-3139-2008.pdf |
| spellingShingle | C. Möstl C. Möstl C. Miklenic C. J. Farrugia M. Temmer M. Temmer A. Veronig A. B. Galvin B. Vršnak H. K. Biernat H. K. Biernat Two-spacecraft reconstruction of a magnetic cloud and comparison to its solar source Annales Geophysicae |
| title | Two-spacecraft reconstruction of a magnetic cloud and comparison to its solar source |
| title_full | Two-spacecraft reconstruction of a magnetic cloud and comparison to its solar source |
| title_fullStr | Two-spacecraft reconstruction of a magnetic cloud and comparison to its solar source |
| title_full_unstemmed | Two-spacecraft reconstruction of a magnetic cloud and comparison to its solar source |
| title_short | Two-spacecraft reconstruction of a magnetic cloud and comparison to its solar source |
| title_sort | two spacecraft reconstruction of a magnetic cloud and comparison to its solar source |
| url | https://www.ann-geophys.net/26/3139/2008/angeo-26-3139-2008.pdf |
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