Solar atmosphere

Impacts of Different Causes on the Inter–Hemispheric Asymmetry of Ionosphere–Thermosphere System at Mid– and High–Latitudes: GITM Simulations

Multiple circular diagrams comparing aligned dipole with IGRG
Tuesday, March 29, 2022

There are significant differences between the Earth’s two hemispheres such as the Earth's magnetic field and the intensity of solar radiation due to Earth's tilt of the rotation axis with respect to the Sun.

Acoustic-gravity wave propagation characteristics in three-dimensional radiation hydrodynamic simulations of the solar atmosphere

6 colorful diagrams of various MURaM models
Wednesday, February 23, 2022

There has been tremendous progress in the degree of realism of three-dimensional radiation magneto-hydrodynamic simulations of the solar atmosphere in the past decades. Four of the most frequently used numerical codes are Bifrost, CO5BOLD, MANCHA3D and MURaM.

Efficient numerical treatment of ambipolar and Hall drift as hyperbolic system

6 graphs showing a two-dimensional test simulation setup
Wednesday, February 23, 2022

Partially ionized plasmas, such as the solar chromosphere, require a generalized Ohm's law including the effects of ambipolar and Hall drift.

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.

Subscribe to RSS - Solar atmosphere