Space Climate 10

Session

1.5 Solar-stellar relations and 3.5 Space climate at other planets (chair Nandi Dibyendu)

10 Jun 2026, 11:56

Åland Maritime Museum

Conveners

1.5 Solar-stellar relations and 3.5 Space climate at other planets (chair Nandi Dibyendu)

• Vladimir Airapetian (NASA)
• Alexander Shapiro (University of Graz, AT)

25. Solar and stellar magnetic activity and variability

Sowmya Krishnamurthy (University of Graz, AT)

10/06/2026, 11:56

Review

All stars with an outer convection zone are magnetically active at some level, with the amount of activity depending on stellar parameters, e.g. the effective temperature and the rotation rate. By far the best studied such star is the Sun. While investigating other stars allows studying stellar activity across a broad range of stellar properties, the Sun provides us with the unique opportunity...

26. Active Regions and Variability Across Main-Sequence stars

Veronika Witzke (University of Graz, AT)

10/06/2026, 12:16

Solicited

Stellar magnetic activity, manifested in spots, faculae, and brightness variability, depends sensitively on fundamental parameters such as stellar mass, age, rotation, and metallicity. Understanding how these factors shape active regions is essential not only for interpreting other stars, but also for placing the Sun into its proper stellar context.
Three-dimensional radiative...

28. Modeling granulation induced variability in spectral lines: lessons from the Sun

Sowmya Krishnamurthy (University of Graz, AT)

10/06/2026, 12:36

Granulation is a fundamental manifestation of near-surface convection in cool main- sequence stars and plays a central role in regulating photospheric structure, spectral variability, and radiative output. Understanding its imprint on spectral lines is essential for connecting solar observations with unresolved stellar measurements and for improving models of stellar surface convection.
In...

29. Local and Galactic scale factors of habitability of Earth and exoplanets, from a Space Climate perspective

Merav Opher (Boston University, US)

10/06/2026, 12:48

In its travel through the Milky Way, the Sun traverses a variety of Galactic environments, including dense interstellar clouds. Astronomical effects on Earth’s past climate have been limited to 10,000-year scales variations in Earth’s orbital parameters while our recent studies suggest that longer-term climate shifts that occur every few million year may be linked to compression of the...