CEDAR email: TESS session on Solar X-ray /VUV Spectra and atmospheric impacts

[Liying Qian]

Dear Colleagues,

The TESS 2022 (Triennial Earth-Sun Summit) will take place in *Bellevue,
Seattle, August 8-12, 2022*. TESS is a joint meeting of the AAS Solar
Physics Division and the Space Physics and Aeronomy Section of the AGU.

*Tha abstract deadline is Friday, April 15, 2022*. Please consider
submitting an abstract to the topical session #13:

*Title: Solar X-ray and VUV Spectra: observation, modeling, and planetary
atmospheric impacts*

Solar X-ray (~0.01-10 nm, or ~0.1-100 keV) and Vacuum Ultraviolet (VUV,
10-200 nm) emissions are produced in the solar atmosphere and significantly
impact the atmospheres of the Earth and other planets. The spectral
irradiance in the longer wavelengths, typically generated by plasma cooler
than 5 MK, changes over days to years as solar active regions emerge,
evolve, rotate on and off the visible solar disk, and are modulated by the
solar cycle. The entire wavelength range also varies on short timescales
due to solar flares, during which the X-rays associated with high plasma
temperatures and accelerated particles can increase by orders of magnitude.
Both scales of variability drive changes in planetary atmospheres. The slow
evolution determines the atmospheric background state, with its own space
weather implications, on top of which flare and other space-weather-driven
storms produce short-term heating and dynamics. Observations in these
wavelengths also provide valuable physical diagnostics in the solar
atmosphere, which are particularly important in light of upcoming missions
to measure the critically under-observed ~0.1-6 nm (~0.2-10 keV) spectral
range. This session invites presentations discussing measurements
(spectroscopic and imaging) and models (empirical and physical) of
spectrally-resolved solar X-ray and VUV radiation and its influence on the
upper atmospheres of the Earth and other planets.

*Conveners:*
Samuel Schonfeld, Institute for Scientific Research, Boston College
Thomas Woods, LASP
Phillip Chamberlin, LASP
Liying Qian, UCAR
Amir Caspi, SWRI Boulder
Christopher Moore, CFA Harvard & Smithsonian
Joshua Pettit, LASP
James Klimchuk, NASA GSFC
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