MAGNETIC ARCADES IN STELLAR CORONAE-I - CYLINDRICAL GEOMETRY

X-ray spectroscopy performed by different astronomical spacecrafts has shown that many active late-type stars possess coronae. For such reas on, the magnetic structure of stellar coronae has raised considerable interest and, by analogy with the Sun, it is generally assumed that st ellar coronae are structured by magnetic fields having the shape of ar cades. Most of those coronal magnetic field configurations assume tran slational symmetry and are based in planar source surfaces. However, a s soon as either the length or the width of such source surfaces becom e non negligible as compared to the stellar radius, the application of the cylindrical geometry seems to be more appropriate. Then, one way of obtaining coronal magnetic configurations is to deal with source do mains extended over a cylindrical surface. In this paper we generate p otential coronal arcades based on cylindrical source surfaces with non negligible length or width compared to the stellar radius. The flux f unction, the magnetic field components, the shape of magnetic field li nes and other characteristic magnitudes have been obtained and analyze d for both cases.