A Statistical Inference Method for Interpreting the CLASP Observations

Štěpán, Jiří; Bueno, J. Trujillo; Belluzzi, L.; Ramos, A. Asensio; Sainz, R. Manso; Alemán, T. del Pino; Casini, R.; Kano, Ryouhei; Winebarger, Amy R.; Auchère, F.; Ishikawa, R.; Narukage, Noriyuki; Kobayashi, K.; Bando, T.; Katsukawa, Y.; Kubo, Masahito; Ishikawa, Shin-­nosuke; Giono, Gabriel; Hara, Hirohisa; Suematsu, Y.; Shimizu, Toshifumi; Sakao, Taro; Tsuneta, S.; Ichimoto, Kiyoshi; Cirtain, Jonathan; Champey, Patrick; Pontieu, Bart De; Carlsson, Mats

doi:10.3847/1538-4357/aad910

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…Recently, the CLASP (Chromospheric Lyman-Alpha Spectro-Polarimeter) project has carried out a high-precision spectro-polarimetric observation by a sounding rocket for the first time [7] and succeeded in detecting significant polarization signals in the Lyman-α line [8]. Great efforts are now being made to understand the detected polarization signals [9][10][11] and to determine the magnetic field vectors in the chromosphere and transition region from them.…”

Section: Introductionmentioning

confidence: 99%

Analytical Solution of the Hanle Effect in View of CLASP and Future Polarimetric Solar Studies

Goto

Ishikawa

Iida

et al. 2019

Atoms

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We have solved a problem of the Hanle effect for the hydrogen Lyman- α line in an intuitive and straightforward way. The Stokes parameters amid an anisotropic radiation field and a magnetic field are derived as an analytical formula which enables us to conduct immediate analyses of observation data taken by spectro-polarimetry. The derived formula is, in particular, supposed to be used for the analysis of the data taken by CLASP (Chromospheric Lyman-Alpha Spectro-Polarimeter), which has aimed at measuring the linear polarization in the hydrogen Lyman- α line (121.6 nm) and then evaluating the magnetic field in the upper chromosphere and the transition region. The dependence of the Stokes parameters on the strength and direction of the magnetic field and on the observation angle is derived with our analytical model. The results show a satisfactory agreement with those of a more rigorous numerical calculation where the radiative transfer is taken into account and the consistency is assured between the anisotropic randiation field and the polarized atomic state.

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Section: Introductionmentioning

confidence: 99%

Analytical Solution of the Hanle Effect in View of CLASP and Future Polarimetric Solar Studies

Goto

Ishikawa

Iida

et al. 2019

Atoms

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“…The CLASP2 instrument and the observationThe Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP)(15)(16)(17)(18)(19)(20) was designed to measure the variation with wavelength of the Stokes I, Q and U parameters of the hydrogen Lyman-α line at 121.6 nm, where I is the intensity and Q and U the linear polarization. This suborbital rocket experiment was carried out in September 2015, and provided the first measurement of the linear polarization signals produced by scattering processes and the Hanle effect in the Lyman-α line(21)(22)(23)(24). CLASP2 is the result of a non-negligible modification of CLASP, but maintaining its novel design based on the inverse Wadsworth configuration(25).…”

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confidence: 99%

Mapping Solar Magnetic Fields from the Photosphere to the Base of the Corona

Ishikawa,

Bueno,

Aleman

et al. 2021

Preprint

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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 II h & k and Mn I) and visible (Fe I) lines. We infer the longitudinal magnetic field from the photosphere to the very upper chromosphere. At the top of the plage chromosphere the field strengths reach more than 300 gauss, strongly correlated with the Mg II k line core intensity and the electron pressure. This unique mapping shows how the magnetic field couples the different atmospheric layers and reveals the magnetic origin of the heating in the plage chromosphere.

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Mapping solar magnetic fields from the photosphere to the base of the corona

et al. 2021

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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 iih & k and Mn i) and visible (Fe i) lines. We infer the longitudinal magnetic field from the photosphere to the very upper chromosphere. At the top of the plage chromosphere, the field strengths reach more than 300 G, strongly correlated with the Mg iik line core intensity and the electron pressure. This unique mapping shows how the magnetic field couples the different atmospheric layers and reveals the magnetic origin of the heating in the plage chromosphere.

show abstract

A Statistical Inference Method for Interpreting the CLASP Observations

Cited by 4 publications

References 13 publications

Analytical Solution of the Hanle Effect in View of CLASP and Future Polarimetric Solar Studies

Analytical Solution of the Hanle Effect in View of CLASP and Future Polarimetric Solar Studies

Mapping Solar Magnetic Fields from the Photosphere to the Base of the Corona

Mapping solar magnetic fields from the photosphere to the base of the corona

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