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Solar atmosphere

Natalia Nikolayevna Stepanian (1931–2018)

Natalia Nikolayevna Stepanian lived until age 87 and was the oldest researcher at the Crimean Astrophysical Observatory (CrAO) when she died following a long illness.

AAS Nova Features a Recent Publication by Philip Judge

Six examples displaying corrugated surfaces at which the centers of UV lines are formed

Understanding the magnitude and occurrence of solar storms is key to predicting events that can be harmful to thousands of Earth-orbiting satellites and the welfare of astronauts.

Neutral hydrogen, helium and solar and stellar coronae

Graphic image of Line Profiles of He I and He II Resonance Line
Wednesday, June 17, 2020

In the context of the solar atmosphere, we re-examine the role of of neutral and ionized species in dissipating the ordered energy of intermediate-mode MHD waves into heat.

Some thoughts on emission-line spectroscopy

Graphic image of intensity and polarization data surrounding the current sheet formed on Sept 10 2017
Tuesday, June 2, 2020

Philip Judge states that the interpretation of emission lines formed in large astrophysical plasmas such as the solar atmosphere faces many challenges. Relatively simple line-ratio estimates of physical parameters, while appealing, are heavily laden with assumptions.

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The National Center for Atmospheric Research is sponsored by the National Science Foundation. Any opinions, findings and conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.