Speaker
Description
In the ever-evolving field of instrumentation for solar physics, the need for high cadence simultaneous observations at high resolutions in both the spatial and spectral domains is undeniable. To successfully achieve such measurements requires the implementation of contemporary technology, with integral field units (IFUs) offering a clear path. Here, we present a novel fibre-fed variation of an IFU, FRANCIS, that offers insights beyond the typical wavelength range of typical solar physics IFUs, extending from the near-ultraviolet to mid-optical regions, covering 390 – 700 nm. Key spectral lines that can be extracted from this region include Ca II H/K, Na I D1/D2, H-beta and Sr II. The benefit of using a fibre-fed IFU can be found in its remapping of a two-dimensional cross-section fibre array to a one-dimensional array, fed into a Czerny-Turner spectrograph for spectral measurements of up to 20 per second. Such a construction provides the opportunity for observers to obtain hyperspectral images of the Sun at high temporal cadences. We present fully processed data from recent active region observations using both the FRANCIS IFU and the ROSA imaging system at the Dunn Solar Telescope covering the Ca II H/K and Na I D1/D2 Fraunhofer lines. By carrying out wave analysis on this data, with the assistance of WaLSA.tools, we will showcase wave propagation and the variation of energy fluxes across the upper photosphere and chromosphere within the vicinity of a sunspot umbra.
| Sessions | Wave generation, energy transport, dissipation and heating |
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