Астрофизический семинар ИНАСАН № 80 (15 июля 2004 г., 11:00)

Опубликовано: 15/07/2004

Докладчик: Grigory Vekstein (Манчестерский университет, Великобритания)

Название доклада: “Исследование механизма нагрева короны по наблюдениям излучения Солнца в рентгеновском и экстремальном УФ-диапазонах”

Краткое содержание доклада:
If the mechanism responsible for creating hot corona of the Sun (as well as of many other stars) is a magnetic one, the underlying heating events are likely to be highly fragmented both in space and in time. Therefore, the nanoflare heating scenario, where these features are at the heart of the concept, is a strong candidate. The major problem is to find a way of testing this theory while individual nanoflares remain beyond observational recognition. Here I’ll discuss a possibility of probing nanoflares with variability of the coronal X-ray and EUV emission. Thus, I present results of numerical simulation of bright coronal loops heated by nanoflares. The aim is to investigate how the imposed power-law energy spectrum of heating events (nanoflares) translates into fluctuations in the intensity of the coronal emission, which can be detected observationally as X-ray and EUV brightenings. These theoretical predictions are compared with recently reported analysis of the observed fluctuations, and I discuss their implications on the deduced energy and occurrence rate of nanoflares.