Data Mining Reconstruction of Magnetotail Reconnection and Implications for Its First-Principle Modeling
| Autor: | Marc Swisdak, M. I. Sitnov, Tetsuo Motoba, G. K. Stephens |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
space weather
010504 meteorology & atmospheric sciences QC1-999 Materials Science (miscellaneous) Biophysics General Physics and Astronomy Magnetosphere Space weather Space (mathematics) computer.software_genre 01 natural sciences Current sheet 0103 physical sciences Coronal mass ejection Astrophysics::Solar and Stellar Astrophysics Physical and Theoretical Chemistry nearest neighbor method 010303 astronomy & astrophysics Mathematical Physics 0105 earth and related environmental sciences Physics magnetotail Solar flare Magnetic reconnection Radius data mining and knowledge discovery magnetic reconnection Physics::Space Physics magnetosphere Data mining computer |
| Zdroj: | Frontiers in Physics, Vol 9 (2021) |
| ISSN: | 2296-424X |
| DOI: | 10.3389/fphy.2021.644884 |
| Popis: | Magnetic reconnection is a fundamental process providing topological changes of the magnetic field, reconfiguration of space plasmas and release of energy in key space weather phenomena, solar flares, coronal mass ejections and magnetospheric substorms. Its multiscale nature is difficult to study in observations because of their sparsity. Here we show how the lazy learning method, known as K nearest neighbors, helps mine data in historical space magnetometer records to provide empirical reconstructions of reconnection in the Earth’s magnetotail where the energy of solar wind-magnetosphere interaction is stored and released during substorms. Data mining reveals two reconnection regions (X-lines) with different properties. In the mid tail (∼30RE from Earth, where RE is the Earth’s radius) reconnection is steady, whereas closer to Earth (∼20RE) it is transient. It is found that a similar combination of the steady and transient reconnection processes can be reproduced in kinetic particle-in-cell simulations of the magnetotail current sheet. |
| Databáze: | OpenAIRE |
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