On the nature of small X-ray flux over active regions
Abstract
Long-lived weak X-ray flux is often observed in active regions. The speculation that this flux is the collective result of a manifold of ``nanoflares'' is investigated. Modelling nanoflares as instantaneously energized loops, it is shown that these loops cannot be shorter than 10 000 km. A modest number of loops with lengths ranging from 10 000 to 30 000 km and electron densities of (1 - 3) × 1011 cm-3 could produce the observed X-ray flux.
- Publication:
-
Advances in Space Research
- Pub Date:
- 1986
- DOI:
- 10.1016/0273-1177(86)90112-2
- Bibcode:
- 1986AdSpR...6f..41S
- Keywords:
-
- Solar Activity;
- Solar X-Rays;
- Solar Flares;
- Solar Flux;
- Solar Physics