@sonhouse saidFrom the original paper (DOI: 10.3847/2041-8213/aa697f):
https://phys.org/news/2017-05-exploration-magnetic-fields-upper-solar.html
Anyone know what the field strength is in terms of Gauss or Tesla?
Actually the spatial variation of the field has been measured using the intensity distribution of the UV-radiation of Hydrogen. The variation of field strength in the so called transition region is in the Order of 10 to 100 Gauss.