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| Paper: |
Solar Energetic Events, the Solar-Stellar Connection, and Statistics of Extreme Space Weather |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
231 |
| Authors: |
Schrijver, C. J. |
| Abstract: |
Observations of the Sun and of Sun-like stars provide access to
different aspects of stellar magnetic activity that, when combined,
help us piece together a more comprehensive picture than can be
achieved from only the solar or the stellar perspective. Where the
Sun provides us with decent spatial resolution of, e.g., magnetic
bipoles and the overlying dynamic, hot atmosphere, the ensemble of
stars enables us to see rare events on at least some
occasions. Where the Sun shows us how flux emergence, dispersal, and
disappearance occur in the complex mix of polarities on the surface,
only stellar observations can show us the activity of the ancient or
future Sun. In this review, I focus on a comparison of statistical
properties, from bipolar-region emergence to flare energies, and
from heliospheric events to solar energetic particle
impacts on Earth. In doing so, I point out some intriguing
correspondences as well as areas where our knowledge falls
short of reaching unambiguous conclusions on, for example, the most extreme
space-weather events that we can expect from the present-day
Sun. The difficulties of interpreting stellar coronal light curves in terms
of energetic events are illustrated with some examples provided by
the SDO, STEREO, and GOES spacecraft. |
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