Ring current decay time model during geomagnetic storms: a simple analytical approach
The ring current growth and decay, characterized by the <I>D<sub>st</sub></I> index, has been studied for thirty years using the Burton et al. (1975) equation. The original formula is based on the restriction of the DPS (Dessler, Parker, and Schoppke) theorem and assuming a...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2008-09-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/26/2543/2008/angeo-26-2543-2008.pdf |
| _version_ | 1818579956845772800 |
|---|---|
| author | R. Monreal MacMahon C. Llop-Romero |
| author_facet | R. Monreal MacMahon C. Llop-Romero |
| author_sort | R. Monreal MacMahon |
| collection | DOAJ |
| description | The ring current growth and decay, characterized by the <I>D<sub>st</sub></I>
index, has been studied for thirty years using the Burton et al. (1975) equation. The original formula is based on the restriction
of the DPS (Dessler, Parker, and Schoppke) theorem and assuming a
constant decay time of particles. The decay time scale is
important because the energy injection rate cannot be determined
it without the knowledge of this parameter.
In a previous work, instead of using a constant value, we introduced
the decay time of particles in the energy rate balance equation
as a continuous function of the absolute value of the pressure
corrected <I>D<sub>st</sub></I> index to avoid the reported discontinuities
determining it. Here, based on the DPS restriction,
we extend our previous empirical work to obtain analytically the proposed continuous function considering
losses due to a global resistive force as a product of
viscous-like, and other related dissipation processes. We test our
model predicting <I>D<sub>st</sub></I> for a couple of specific storm events and
also comparing our results with forecasts of a good reference
model appeared in the literature. |
| first_indexed | 2024-12-16T07:09:57Z |
| format | Article |
| id | doaj.art-3e58dabd104f4a9eb65cac869bf71765 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-16T07:09:57Z |
| publishDate | 2008-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-3e58dabd104f4a9eb65cac869bf717652022-12-21T22:39:55ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762008-09-01262543255010.5194/angeo-26-2543-2008Ring current decay time model during geomagnetic storms: a simple analytical approachR. Monreal MacMahon0C. Llop-Romero1University of Magallanes, CEQUA, Space Physics Lab, Casilla 113-D, Punta Arenas, ChileUniversity of Magallanes, CEQUA, Space Physics Lab, Casilla 113-D, Punta Arenas, ChileThe ring current growth and decay, characterized by the <I>D<sub>st</sub></I> index, has been studied for thirty years using the Burton et al. (1975) equation. The original formula is based on the restriction of the DPS (Dessler, Parker, and Schoppke) theorem and assuming a constant decay time of particles. The decay time scale is important because the energy injection rate cannot be determined it without the knowledge of this parameter. In a previous work, instead of using a constant value, we introduced the decay time of particles in the energy rate balance equation as a continuous function of the absolute value of the pressure corrected <I>D<sub>st</sub></I> index to avoid the reported discontinuities determining it. Here, based on the DPS restriction, we extend our previous empirical work to obtain analytically the proposed continuous function considering losses due to a global resistive force as a product of viscous-like, and other related dissipation processes. We test our model predicting <I>D<sub>st</sub></I> for a couple of specific storm events and also comparing our results with forecasts of a good reference model appeared in the literature.https://www.ann-geophys.net/26/2543/2008/angeo-26-2543-2008.pdf |
| spellingShingle | R. Monreal MacMahon C. Llop-Romero Ring current decay time model during geomagnetic storms: a simple analytical approach Annales Geophysicae |
| title | Ring current decay time model during geomagnetic storms: a simple analytical approach |
| title_full | Ring current decay time model during geomagnetic storms: a simple analytical approach |
| title_fullStr | Ring current decay time model during geomagnetic storms: a simple analytical approach |
| title_full_unstemmed | Ring current decay time model during geomagnetic storms: a simple analytical approach |
| title_short | Ring current decay time model during geomagnetic storms: a simple analytical approach |
| title_sort | ring current decay time model during geomagnetic storms a simple analytical approach |
| url | https://www.ann-geophys.net/26/2543/2008/angeo-26-2543-2008.pdf |
| work_keys_str_mv | AT rmonrealmacmahon ringcurrentdecaytimemodelduringgeomagneticstormsasimpleanalyticalapproach AT cllopromero ringcurrentdecaytimemodelduringgeomagneticstormsasimpleanalyticalapproach |