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SUMMARY:Spectral Irradiance Variability from Sun to Stars: Middle-Atmosphe
 re Sensitivities and Habitability Links (by Anna Shapiro)
DTSTART:20251016T090000Z
DTEND:20251016T094500Z
DTSTAMP:20250812T082954Z
UID:presentation-169.series-10
DESCRIPTION:Solar radiation is the primary energy source for Earth’s atm
 osphere\, and it varies across all resolved timescales. While X-rays are a
 bsorbed in the upper atmosphere\, UV radiation reaches the middle atmosphe
 re and drives chemical and physical processes that shape its photochemistr
 y\, dynamics\, temperature\, and composition. We investigate how variabili
 ty associated with the ~27-day solar rotation and the ~11-year solar activ
 ity cycle affects Earth’s middle atmosphere. Using one- and three-dimens
 ional chemistry–climate models\, we examine the sensitivity of key speci
 es (OH\, H₂O\, O₃) and temperature to changes in spectral solar irradi
 ance. We also assess how uncertainties across spectral solar irradiance da
 ta sets propagate into modeled responses and confront the simulations with
  atmospheric measurements. Extending beyond the Sun\, we explore how stell
 ar parameters reshape stellar UV spectra and\, in turn\, modulate exoplane
 tary ozone shielding and surface UV exposure.
LOCATION:SR Wegener Center\, Brandhofgasse 5\, 1st floor
ORGANIZER;CN="Douglas Maraun";ROLE=CHAIR:MAILTO:douglas.maraun@uni-graz.at
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