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- W69337112 abstract "We describe the measurement of magnetic fields in prominences. Using the He D3 line as example we describe and illustrate the computation of the polarization emitted by He atoms in the presence of magnetic fields. The relatively weak magnetic fields expected in prominences require taking into consideration a long series of quantum coherences between the atomic levels of the He atom, coherences that are critical for the sensitivity of the emitted radiation and its polarization to the magnetic fields. But solving that quantum problem is only half the task: the observed polarized profiles need to be compared to the computed ones until a match is found. This inference or inversion can only work when the appropriate numerical technicals are put to work, techniques that help identify what magnetic field is the best solution for an observed profile, that can make use of all the available observables while being robust in front of noise and the low brightness of prominences and filaments respect to the entouring photosphere. These difficulties can be tackled but at the prixe of some approximations that have to be kept in mind in the analysis of prominence magnetic fields at the risk of serious mistakes on the inferred magnetic fields. Improving upon those approximations marks also the path for the future, with which description we will conclude this chapter." @default.
- W69337112 created "2016-06-24" @default.
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- W69337112 date "2014-10-21" @default.
- W69337112 modified "2023-09-25" @default.
- W69337112 title "Magnetometry of Prominences" @default.
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- W69337112 doi "https://doi.org/10.1007/978-3-319-10416-4_8" @default.
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