Naslov
Magnetic Flux Change Rates and Nonthermal Flare Emission

Autori
Miklenic, Christiane ; Veronig, Astrid ; Vršnak, Bojan

Izvornik
Central European astrophysical bulletin (1845-8319) 33 (2009); 197-206

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
active Sun; flares; magnetic fields; chromosphere; corona

Sažetak
We tested the standard flare model by measuring the magnetic flux change rate in five flares of different GOES classes and compared it to the observed nonthermal flare hard X-ray emission. In addition we calculated the cumulated positive and negative magnetic reconnection flux, as well as the total reconnection flux. We also investigated the relations between the total reconnection flux, the GOES importance of the events, and the linear velocity of the flare-associated CMEs. The required observables (newly brightened flare area and magnetic field strength inside this area) were measured using high-cadence Hα and TRACE 1600 Å image time series along with MDI/SOHO magnetograms. RHESSI and INTEGRAL hard X-ray time profiles in nonthermal energy bands served as observable proxies for the flare energy release rate. We found good temporal correlations between the derived magnetic flux change rate and the observed nonthermal emission in all events. Cumulated positive and negative fluxes were roughly balanced. The amount of magnetic reconnection flux was larger in more energetic events than in weaker ones. Flares with more reconnection flux were associated with faster CMEs. The findings indicate that the standard flare model is applicable to the analysed events.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA