Closed coronal structures. II - Generalized hydrostatic model

Abstract

view Abstract Citations (296) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Closed coronal structures. II - Generalized hydrostatic model Serio, S. ; Peres, G. ; Vaiana, G. S. ; Golub, L. ; Rosner, R. Abstract Numerical computations of stationary solar coronal loop atmospheres are used to extend earlier analytical work. Two classes of loops are examined, namely symmetric loops with a temperature maximum at the top but now having a length greater than the pressure scale height and loops which have a local temperature minimum at the top. For the first class, new scaling laws are found which relate the base pressure and loop length to the base heating, the heating deposition scale height, and the pressure scale height. It is found that loops for which the length is greater than about two to three times the pressure scale height do not have stable solutions unless they have a temperature minimum at the top. Computed models with a temperature inversion at the top are permitted in a wider range of heating deposition scale height values than are loops with a temperature maximum at the top. These results are discussed in relation to observations showing a dependence of prominence formation and stability on the state of evolution of magnetic structures, and a general scenario is suggested for the understanding of loop evolution from emergence in active regions through the large-scale structure phase to opening in coronal holes. Publication: The Astrophysical Journal Pub Date: January 1981 DOI: 10.1086/158597 Bibcode: 1981ApJ...243..288S Keywords: Atmospheric Models; Coronal Holes; Coronal Loops; Magnetohydrostatics; Solar Atmosphere; Solar Corona; Atmospheric Heating; Base Pressure; Magnetohydrodynamics; Solar Physics; Solar Prominences; Temperature Distribution; Temperature Inversions; Solar Physics full text sources ADS |