Investigations of Solar Activities of Various Scales in Both Theory and Observation

Jun Lin

Yunnan Astronomical Observatories of the Chinese Academy of Sciences

Tuesday, October 1, 2024

12:00pm

NW17-218 Hybrid

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Abstract: Magnetic field is the fundamental topic of solar physics, it is involved in all the activities of large variety of scales. Magnetic reconnection is a ubiquitous process that frequently occurs in the environment which fills with plasma and magnetic field. In this talk, I shall introduce recent works of the Group of Solar Activities and CME Theory at the Yunnan Astronomical Observatories in Kunming, Yunnan, China.  These works include studies in both theories and observations of various solar activities and the related topics over a large range of scales. We investigated the CME structures seen in EUV during its propagation and gave the unique explanation. Fine structures inside large scale current sheet behind CME are analyzed, they play an important role in converting the magnetic energy into the other types of energy in the large scale current sheet, and they result from turbulence as a result of the tearing mode instability.  Small scale brightening in the low atmosphere is studied numerically, and its implication to the corona heating is discussed. Finally, a deep space mission that aims to detect the current sheet behind CME will also be introduced briefly.

Bio: Dr. Jun Lin is a Principal Scientist in solar physics at the Yunnan Astronomical Observatories of the Chinese Academy of Sciences. His primary research concerns solar eruptions, including solar flares, eruptive prominence, coronal mass ejections, and transient disturbances in the interplanetary medium around the Earth (also known as Space Weather) and their effects on the Earth. Dr. Lin's work covers both theory and observations. One of Dr. Lin's best-known accomplishments is the Lin-Forbes model of solar eruptions, widely recognized as one of the classical standard solar eruption models. Other important achievements Dr. Lin made include pioneering studies on direct observations and analyses of essential features of solar eruptions predicted by the Lin-Forbes model. These features include the magnetic reconnection region or the current sheet, the reconnection inflows and outflows, as well as the thickness and turbulent structures of the current sheet.