Vortices evolution in the solar atmosphere

Physical Simulation of Baroclinic Waves and Vortices in the Atmosphere

Evolution of force-free electric currents in the solar atmosphere

The new 3-D numerical model studying evolution of force-free electric currents in the solar atmosphere is presented. The initial dipole magnetic field is considered in a simplified active region. Starting from a low electric current, which penetrates the photosphere, and increasing the current intensity, the path of force-free electric current and the corresponding magnetic field are computed. ...

Implications of Solar Evolution for the Earth's Early Atmosphere.

The roughly 25 percent increase in luminosity over the life of the sun shared by many different solar models is shown to be a very general result, independent of the uncertainties suggested by the solar neutrino experiment. Superficially, this leads to a conflict with the climatic history of the earth, and if basic concepts of stellar evolution are not fundamentally in error, compensating effec...

The Solar Atmosphere

Looking at the solar photosphere, we see the top of the convection zone in the form of granulation: Hot gas rising from the solar interior as part of the energy transport process reaches a position where the opacity is no longer sufficient to prevent the escape of radiation. The gas expands, radiates, and cools and in so doing loses its buoyancy and descends. These motions, ultimately driven by...

Explosive events in the solar atmosphere

Two examples of explosive events observed with SUMER in transition region spectral lines are reported here; one detected in C iv 1548 Å, in a region within the northern polar coronal hole, and the other in O vi 1032 Å, in an active region. The event measured in C iv lasted ∼ 3 min and extended approximately a region of 8 arc sec along the slit (N-S) and 8 arc sec in the E-W direction. Velocitie...