| Presentation Title: | Global impact of emerging internetwork fields on the low solar atmosphere |
| Author(s): | Milan Gosic, Bart De Pontieu, Alberto Sainz Dalda |
Abstract:
Small-scale internetwork (IN) magnetic fields have been considered as potential sources of energy and mass for the solar chromosphere and corona. Several studies show that single instances of emerging fields can cause localized heating in the low solar atmosphere by interacting with the preexisting ambient field lines. However, the global impact of the newly emerging IN fields on the solar atmosphere is still unknown. In this work we analyze the spatiotemporal evolution of IN bipolar flux features and their impact on the energetics and dynamics of the quiet Sun atmosphere. We used high-resolution, multi-wavelength, coordinated observations from the Interface Region Imaging Spectrograph (IRIS), Hinode, and the Solar Dynamics Observatory (SDO) to identify emerging IN magnetic fields and track their spatial and temporal evolution. Our observations suggest that only the largest IN bipoles are capable of locally heating the solar atmosphere, while the global contribution of these bipoles appears to be minimal, i.e., the newly emerging IN bipoles cannot globally maintain the chromospheric heating directly through interaction with the ambient overlying magnetic fields. However, it should be noted that the sensitivity level, spatial resolution, and duration of our observations limit the total number of IN bipoles detected, as well as their estimated impact. To detect smaller and weaker IN fields that maintain basal flux, and examine their contribution to the chromospheric heating, a higher resolution, sensitivity, and longer time series would be necessary.