Colloquium: Stefan Hofmeister (AIP)

Solar coronal holes and their effect on the solar system

Coronal holes are the lowest density features in the solar corona; they exhibit an open-to-interplanetary-space magnetic field topology and are the source regions of high-speed solar wind streams. These solar wind streams transcend our solar system with velocities of up to 800 km/s and shape interplanetary space. When the hit Earth, they cause geomagnetic storms and substorms, posing a risk to satellites both in low- and high-altitude orbits. In this talk, I will give an overview on the physics of coronal holes and their associated high-speed streams, how they are related to the solar wind acceleration and coronal heating problem, on the shape of plasma streams in the inner heliosphere and over the solar cycle, on the chain of events which lead to geomagnetic storms and the thread satellites. I’d like to conclude this talk with an open discussion on the synergies between the field of coronal holes and high-speed streams in solar physics, stellar physics, and exoplanet research.

• Date:
  March 17, 2022, 2:30 p.m. – 3:30 p.m.
  
  
• Location:

  Colloquium Zoom room

  
  
• Contact:
  Silva Järvinen