HAO Colloquium - Viggo Hansteen, University of Oslo

Ellerman bombs and UV bursts: reconnection at different atmospheric layers?

The emergence of magnetic flux through the photosphere and into the outer solar atmosphere produces, amongst many other phenomena, the appearance of Ellerman bombs (Ems) in the photosphere. EBs are observed in the wings of H(alpha) and are highly likely to be due to reconnection in the photosphere, below the chromospheric canopy. But signs of the reconnection process are also observed in several other spectral lines, typical of the chromosphere or transition region. An example are the UV bursts observed in the transition region lines of Si IV. In this talk we will discuss high cadence coordinated observations between the 1-m Swedish Solar Telescope and the IRIS spacecraft as well as “realistic” numerical models of flux emergence into the outer solar atmosphere in order to study the possible relationship between reconnection events at different layers in the atmosphere, and in particular, the timing history between them.

Date and time: 
Wednesday, July 18, 2018 - 2:00pm to 3:00pm