Dynamics and Flows in Active Region NOAA12737 that can contribute to Type III Bursts observed by Parker Solar Probe during Encounter 2.

Abstract:

We have analysed solar activity on the Sun during encounter 2 of the Parker Solar Probe mission. We studied the period from 30^th March to 4^th April when a small active region (NOAA 12737) emerged. This active region showed no significant flaring. During this time period there were however, an increasing number of type III bursts measured by the FIELDS instrument. We analyse solar data from SDO-AIA, SDO-HMI and Hinode EIS to determine what the potential sources of the type III bursts could be, which occur on timescales of tens of seconds. The active region core shows small brightenings in EUV and X-ray wavebands, but these are not continuous, and seem unlikely to be connected. There are magnetic field changes due to the active region emergence, which occur on timescales of hours rather than seconds. There are small scale magnetic flux emergences but these are not frequent enough to be linked to the continuous type III bursts. As the active region emerges, we track the upflows at the edge of the active region as they are created and evolve. We show evidence of variations in the upflows that seem to be the most likely candidates for the sources of the type III bursts.