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Mapping solar magnetic fields from the photosphere to the base of the corona
Hara, Hirohisa; De Pontieu, Bart; Carlsson, Mats +25 more
Routine ultraviolet imaging of the Sun's upper atmosphere shows the spectacular manifestation of solar activity; yet we remain blind to its main driver, the magnetic field. Here we report unprecedented spectropolarimetric observations of an active region plage and its surrounding enhanced network, showing circular polarization in ultraviolet (Mg I…
The development of lower-atmosphere turbulence early in a solar flare
Fletcher, L.; Labrosse, N.; Jeffrey, N. L. S. +1 more
We present the first observational study of the onset and evolution of solar flare turbulence in the lower solar atmosphere on an unprecedented time scale of 1.7 s using the Interface Region Imaging Spectrograph observing plasma at a temperature of 80,000 K. At this time resolution, nonthermal spectral line broadening, indicating turbulent velocit…