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CMEs and SEPs During November-December 2020: A Challenge for Real-Time Space Weather Forecasting

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Title: CMEs and SEPs During November-December 2020: A Challenge for Real-Time Space Weather Forecasting
Authors: Palmerio, Erika, Lee, Christina O., Mays, M. Leila, Luhmann, Janet G., Lario, David, Sánchez-Cano, Beatriz, Richardson, Ian G., Vainio, Rami, Stevens, Michael L., Cohen, Christina M. S., Steinvall, Konrad, Möstl, Christian, Weiss, Andreas J., Nieves-Chinchilla, Teresa, Li, Yan, Larson, Davin E., Heyner, Daniel, Bale, Stuart D., Galvin, Antoinette B., Holmström, Mats, Khotyaintsev, Yuri V., Maksimovic, Milan, Mitrofanov, Igor G.
Publication Year: 2022
Collection: Astrophysics
Physics (Other)
Subject Terms: Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics, Physics - Space Physics
More Details: Predictions of coronal mass ejections (CMEs) and solar energetic particles (SEPs) are a central issue in space weather forecasting. In recent years, interest in space weather predictions has expanded to include impacts at other planets beyond Earth as well as spacecraft scattered throughout the heliosphere. In this sense, the scope of space weather science now encompasses the whole heliospheric system, and multi-point measurements of solar transients can provide useful insights and validations for prediction models. In this work, we aim to analyse the whole inner heliospheric context between two eruptive flares that took place in late 2020, i.e. the M4.4 flare of November 29 and the C7.4 flare of December 7. This period is especially interesting because the STEREO-A spacecraft was located ~60{\deg} east of the Sun-Earth line, giving us the opportunity to test the capabilities of "predictions at 360{\deg}" using remote-sensing observations from the Lagrange L1 and L5 points as input. We simulate the CMEs that were ejected during our period of interest and the SEPs accelerated by their shocks using the WSA-Enlil-SEPMOD modelling chain and four sets of input parameters, forming a "mini-ensemble". We validate our results using in-situ observations at six locations, including Earth and Mars. We find that, despite some limitations arising from the models' architecture and assumptions, CMEs and shock-accelerated SEPs can be reasonably studied and forecast in real time at least out to several tens of degrees away from the eruption site using the prediction tools employed here.
Comment: 50 pages, 16 figures, 3 tables, accepted for publication in Space Weather (v2 contains updated CCMC links after their website update)
Document Type: Working Paper
DOI: 10.1029/2021SW002993
Access URL: http://arxiv.org/abs/2203.16433
Accession Number: edsarx.2203.16433
Database: arXiv
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  Data: CMEs and SEPs During November-December 2020: A Challenge for Real-Time Space Weather Forecasting
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  Data: Predictions of coronal mass ejections (CMEs) and solar energetic particles (SEPs) are a central issue in space weather forecasting. In recent years, interest in space weather predictions has expanded to include impacts at other planets beyond Earth as well as spacecraft scattered throughout the heliosphere. In this sense, the scope of space weather science now encompasses the whole heliospheric system, and multi-point measurements of solar transients can provide useful insights and validations for prediction models. In this work, we aim to analyse the whole inner heliospheric context between two eruptive flares that took place in late 2020, i.e. the M4.4 flare of November 29 and the C7.4 flare of December 7. This period is especially interesting because the STEREO-A spacecraft was located ~60{\deg} east of the Sun-Earth line, giving us the opportunity to test the capabilities of "predictions at 360{\deg}" using remote-sensing observations from the Lagrange L1 and L5 points as input. We simulate the CMEs that were ejected during our period of interest and the SEPs accelerated by their shocks using the WSA-Enlil-SEPMOD modelling chain and four sets of input parameters, forming a "mini-ensemble". We validate our results using in-situ observations at six locations, including Earth and Mars. We find that, despite some limitations arising from the models' architecture and assumptions, CMEs and shock-accelerated SEPs can be reasonably studied and forecast in real time at least out to several tens of degrees away from the eruption site using the prediction tools employed here.<br />Comment: 50 pages, 16 figures, 3 tables, accepted for publication in Space Weather (v2 contains updated CCMC links after their website update)
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