Variability of The Corona
A portrait as diversified as the one already pointed out for the coronal features is emphasized by the analysis of the dynamics of the main structures of the corona, which evolve in times very different among them. Studying the coronal variability in its complexity is not easy because the times of evolution of the different structures can vary considerably: from seconds to several months. The typical sizes of the regions where coronal events take place vary in the same way, as it is shown in the following table.
| Coronal event | Typical time-scale | Typical length-scale (Mm) |
|---|---|---|
| Active region flare | 10 to 10,000 seconds | 10–100 |
| X-ray bright point | minutes | 1–10 |
| Transient in large-scale structures | from minutes to hours | ~100 |
| Transient in interconnecting arcs | from minutes to hours | ~100 |
| Quiet Sun | from hours to months | 100–1,000 |
| Coronal hole | several rotations | 100–1,000 |
Read more about this topic: Corona
Famous quotes containing the word variability:
“The grand points in human nature are the same to-day they were a thousand years ago. The only variability in them is in expression, not in feature.”
—Herman Melville (1819–1891)