The coronal and transition region temperature structure of a solar active region |
| |
| Authors: | Randolph H Levine J P Pye |
| |
| Institution: | (1) Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass., U.S.A.;(2) Physics Department, The University, LE1 7RH Leicester, U.K. |
| |
| Abstract: | Using measurements of EUV and X-ray spectral lines we derive the differential emission measure vs electron temperature T from the transition region to the corona of an active region (105
T <5 × 106 K). The total emission measure and radiative losses are of order 3 × 1048 cm–3 and 4 × 1026 ergss–1 respectively. The emission measure at T > 106 K (i.e. that mainly responsible for the X-ray emission) is about 75% of the total. We also examine the use of Mg x  625 Å as an indicator of coronal electron density. A set of theoretical energy balance models of coronal loops in which the loop divergence is a variable parameter is presented and compared with the observations. Particular attention is given to the limitations inherent in any such comparison. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
