The θBn problem: Determination of local magnetic parameters of interplanetary shocks from in situ IMF data
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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2001
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| author | J. Américo González Esparza |
| author_facet | J. Américo González Esparza |
| contents | The θBn problem: Determination of local magnetic parameters of interplanetary shocks from in situ IMF data J. Américo González Esparza Andre Balogh Ciencias de la Tierra MHD discontinuities interplanetary shocks Interplanetary physics The angle θBn is the angle between the upstream magnetic field and the shock normal direction and is important for manyphenomena in interplanetary physics. We show that for most shock observations, θBn cannot be determined without addressing itsassociated uncertainty. We propose a simple computational technique to infer a more reliable value for θBn and its associateduncertainty. This technique is based on magnetic field data only, and can be useful when we cannot apply the iterative techniquesinvolving magnetic and plasma parameters. This method also can be applied to study other MHD discontinuities. To infer theshock local parameters, it is necessary to define upstream and downstream regions in the Rankine-Hugoniot relations. Fluctuationsof the interplanetary magnetic field, particularly its direction, restrict the duration of these regions to just a few minutesbefore and after the shock. Quasi-parallel shocks have larger associated uncertainties than quasi-perpendicular shocks. When θBnhas a large uncertainty, this angle becomes time dependent, i.e., does not have a well-defined value but varies within an angularrange. 2001 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56840105 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.40 |
| format | Artículo científico |
| id | redalyc_56840105 |
| institution | Redalyc |
| language | en |
| publishDate | 2001 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | The θBn problem: Determination of local magnetic parameters of interplanetary shocks from in situ IMF data J. Américo González Esparza Ciencias de la Tierra MHD discontinuities interplanetary shocks Interplanetary physics The θBn problem: Determination of local magnetic parameters of interplanetary shocks from in situ IMF data J. Américo González Esparza Andre Balogh Ciencias de la Tierra MHD discontinuities interplanetary shocks Interplanetary physics The angle θBn is the angle between the upstream magnetic field and the shock normal direction and is important for manyphenomena in interplanetary physics. We show that for most shock observations, θBn cannot be determined without addressing itsassociated uncertainty. We propose a simple computational technique to infer a more reliable value for θBn and its associateduncertainty. This technique is based on magnetic field data only, and can be useful when we cannot apply the iterative techniquesinvolving magnetic and plasma parameters. This method also can be applied to study other MHD discontinuities. To infer theshock local parameters, it is necessary to define upstream and downstream regions in the Rankine-Hugoniot relations. Fluctuationsof the interplanetary magnetic field, particularly its direction, restrict the duration of these regions to just a few minutesbefore and after the shock. Quasi-parallel shocks have larger associated uncertainties than quasi-perpendicular shocks. When θBnhas a large uncertainty, this angle becomes time dependent, i.e., does not have a well-defined value but varies within an angularrange. 2001 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56840105 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.40 |
| title | The θBn problem: Determination of local magnetic parameters of interplanetary shocks from in situ IMF data |
| topic | Ciencias de la Tierra MHD discontinuities interplanetary shocks Interplanetary physics |
| url | https://www.redalyc.org/articulo.oa?id=56840105 |