Development of a formalism for computing in situ transits of Earth-directed CMEs – Part 2: Towards a forecasting tool
<p>Earth-directed coronal mass ejections (CMEs) are of particular interest for space weather purposes, because they are precursors of major geomagnetic storms. The geoeffectiveness of a CME mostly relies on its physical properties like magnetic field and speed. There are multiple efforts in th...
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doaj-ff7300d4aa234e97ac316c5b6de690002020-11-25T03:53:50ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762020-06-013865768110.5194/angeo-38-657-2020Development of a formalism for computing in situ transits of Earth-directed CMEs – Part 2: Towards a forecasting toolP. Corona-Romero0P. Corona-Romero1P. Riley2Space Weather National Laboratory (LANCE), Insituto de Geofisica Unidad Michoacan, Universidad Nacional Autonoma de Mexico, Campus Morelia, Morelia, Michoacan, MexicoCONACYT-Insituto de Geofisica Unidad Michoacan, Universidad Nacional Autonoma de Mexico, Campus Morelia, Morelia, Michoacan, MexicoPredictive Science Inc. 9990 Mesa Rim Rd Suite 170, San Diego, CA 92127, USA<p>Earth-directed coronal mass ejections (CMEs) are of particular interest for space weather purposes, because they are precursors of major geomagnetic storms. The geoeffectiveness of a CME mostly relies on its physical properties like magnetic field and speed. There are multiple efforts in the literature to estimate in situ transit profiles of CMEs, most of them based on numerical codes. In this work we present a semi-empirical formalism to compute in situ transit profiles of Earth-directed fast halo CMEs. Our formalism combines analytic models and empirical relations to approximate CME properties as would be seen by a spacecraft near Earth's orbit. We use our formalism to calculate synthetic transit profiles for 10 events, including the <i>Bastille Day event</i> and 3 <i>varSITI Campaign</i> events. Our results show qualitative agreement with in situ measurements. Synthetic profiles of speed, magnetic intensity, density, and temperature of protons have average errors of 10 %, 27 %, 46 %, and 83 %, respectively. Additionally, we also computed the travel time of CME centers, with an average error of 9 %. We found that compression of CMEs by the surrounding solar wind significantly increased our uncertainties. We also outline a possible path to apply this formalism in a space weather forecasting tool.</p>https://www.ann-geophys.net/38/657/2020/angeo-38-657-2020.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
P. Corona-Romero P. Corona-Romero P. Riley |
spellingShingle |
P. Corona-Romero P. Corona-Romero P. Riley Development of a formalism for computing in situ transits of Earth-directed CMEs – Part 2: Towards a forecasting tool Annales Geophysicae |
author_facet |
P. Corona-Romero P. Corona-Romero P. Riley |
author_sort |
P. Corona-Romero |
title |
Development of a formalism for computing in situ transits of Earth-directed CMEs – Part 2: Towards a forecasting tool |
title_short |
Development of a formalism for computing in situ transits of Earth-directed CMEs – Part 2: Towards a forecasting tool |
title_full |
Development of a formalism for computing in situ transits of Earth-directed CMEs – Part 2: Towards a forecasting tool |
title_fullStr |
Development of a formalism for computing in situ transits of Earth-directed CMEs – Part 2: Towards a forecasting tool |
title_full_unstemmed |
Development of a formalism for computing in situ transits of Earth-directed CMEs – Part 2: Towards a forecasting tool |
title_sort |
development of a formalism for computing in situ transits of earth-directed cmes – part 2: towards a forecasting tool |
publisher |
Copernicus Publications |
series |
Annales Geophysicae |
issn |
0992-7689 1432-0576 |
publishDate |
2020-06-01 |
description |
<p>Earth-directed coronal mass ejections (CMEs) are of particular interest for space weather purposes, because they are precursors of major geomagnetic storms. The geoeffectiveness of a CME mostly relies on its physical properties like magnetic field and speed. There are multiple efforts in the literature to estimate in situ transit profiles of CMEs, most of them based on numerical codes. In this work we present a semi-empirical formalism to compute in situ transit profiles of Earth-directed fast halo CMEs. Our formalism combines analytic models and empirical relations to approximate CME properties as would be seen by a spacecraft near Earth's orbit. We use our formalism to calculate synthetic transit profiles for 10 events, including the <i>Bastille Day event</i> and 3 <i>varSITI Campaign</i> events. Our results show qualitative agreement with in situ measurements. Synthetic profiles of speed, magnetic intensity, density, and temperature of protons have average errors of 10 %, 27 %, 46 %, and 83 %, respectively. Additionally, we also computed the travel time of CME centers, with an average error of 9 %. We found that compression of CMEs by the surrounding solar wind significantly increased our uncertainties. We also outline a possible path to apply this formalism in a space weather forecasting tool.</p> |
url |
https://www.ann-geophys.net/38/657/2020/angeo-38-657-2020.pdf |
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