Investigating Nonequilibrium Ionization and Recombination Processes in Solar Wind and Transient Plasma
Notice bibliographique
Résumé
In this work, I investigated the evolution of coronal mass ejections (CMEs) and the solar wind by combining remote sensing, in situ observations, and nonequilibrium ionization modeling using the Michigan Ionization Code (MIC). The work investigates physical processes governing the plasma’s radial evolution and the injection of energy to the system. The aim of this thesis is to investigate low ionized charge states in CMEs and He+ in the solar wind to understand their origin and formation. Through simulations of charge states with the MIC, the modeling work reconstructed the thermodynamic evolution of several plasma structures within the expansion of a coronal mass ejection (CME) by examining heliospheric ion composition within the ejecta. The reconstructed CME contained rare, low charge states, which are often absent within CMEs, along with typical highly ionized coronal plasma. Modeling results show that the source of the low ionized material in the CME measurements is from prominence material and is not a result of recombination from cooling of the plasma. However, part of the prominence also exists in a highly ionized form. These results provide important constraints to the evolution of prominence material that is often observed at the Sun but rarely measured in situ. In addition, this study indicated the CME components experienced rapid, continuous, and non-uniform heating as they travelled away from the Sun. Motivated by these results, I identified useful spectral lines to study the eruption with future solar telescopes. This study investigated the diagnostic potential of several spectral lines spanning the EUV to near-Infrared and ranging between chromospheric and sub-flare temperatures to enable a comprehensive examination of solar eruptions that can be coupled with in situ and nonequilibrium modeling. I present a list of recommended spectral lines along with a discussion of their diagnostic capability. Results show that several of the most observable lines will be within the planned observations of future solar telescopes; Daniel K. Inouye Solar Telescope (DKIST), and Upgraded COronal Multi-channel Polarimeter (UCoMP), and instruments on Solar Orbiter, e.g. Spectral Imaging of the Coronal Environment (SPICE) and Multi-Element Telescope for Imaging and Spectroscopy (METIS). Furthermore, I investigated the presence of singly ionized He in the solar wind, that are outside of CME cores and pick up ions, to determine their origin and formation mechanism using the MIC. Current ionization models of the solar wind cannot account for the enhanced density of He+ observed at 1AU, therefore we reconcile the additional He+ through charge exchange of solar wind alphas and outgassed interplanetary dust neutrals. We find that charge exchange processes can be an important mechanism in the formation of solar He+ from alpha particles below 10-15Rsun, and due to this, may potentially shape ion densities for other species in the solar wind as well.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».