Radiation Processes in Astronomy - Radiation Processes in Astronomy: L1 - Specific Intensity, Energy Density

This lecture introduces specific intensity, the quantity we astronomers most often start with for descriptions of light and its transport through media. A simple thought experiment is used to introduce it, which I think may offer a somewhat more intuitive definition than what I see in most texts. From this we define energy density of radiation field, and end up starting our discussion on radiative flux. Course: Radiation Processes in Astronomy Lecturer: Prof. Jon Sundqvist Programme: KU Leuven Bachelor Physics & Master Astronomy & Astrophysics I record lectures live and place them here un-edited, in the hope that it will provide a more authentic feeling of the sort: "we're doing the actual work here and now". So like I keep telling students in the classroom: whenever you discover me doing some error let me know directly; for this channel this means make a comment on the videos. Then we can have a look at it, and thereby learn nicely from each other as we continue to develop our knowledge. You find all lectures under: https://www.youtube.com/playlist?list=PLrGAIWCGSKlDXALWS_6R4Bv3D1vEk85NX If you're interested more in my group's research, here're two links for that: https://fys.kuleuven.be/ster/research-projects/equation-folder/equation-home https://www.youtube.com/@JonSundqvist