Seminar:- Cosmic Rays in Molecular Clouds and Discs
Cosmic rays (CRs) play a key role in the physics and chemistry of molecular clouds and circumstellar disks, being a primary source of heating and ionization in these regions. The resulting ionization fraction governs the evolving chemistry, determines the coupling of the gas with the galactic magnetic field, controls the rate of dust coagulation and the maximum size of the aggregates, etc. As the energy spectra of interstellar CRs penetrating into the clouds and disks can be drastically modified and attenuated, the knowledge of the local CR spectra is essential for adequate description of the physical and chemical processes occurring in these dense phases. The speaker will present the recently developed approaches allowing accurate calculation of the local CR spectra.
時間：2018.11.28(三) 14:30
地點：香港大學 莊月明物理樓522室
講者：Dr. Alexei Ivlev(Max Planck Institute for Extraterrestrial Physics, Garching, Germany)
語言：英語
免費講座，歡迎參加
此活動由香港大學物理系主辦。
