We present information on two spectral lines, Fe I 6173 Å and Ni I 6768 Å, that were candidates for use in the Helioseismic and Magnetic Imager (HMI) instrument. Both Fe I and Ni I profiles have clean continuum and no blends that threaten performance. The higher Landé factor of Fe I means its operational velocity range in regions of strong magnetic field is smaller than for Ni I. Fe I performs better than Ni I for vector magnetic field retrieval. Inversion results show that Fe I consistently determines field strength and flux more accurately than the Ni I line. Inversions show inclination and azimuthal errors are recovered to ≈ 2° above 600 Mx/cm2 for Fe I and above 1000 Mx/cm2 for Ni I. The Fe I line was recommended, and ultimately chosen,...
The Helioseismic and Magnetic Imager (HMI) instrument is a major component of NASA's Solar Dynamics ...
Aims:We investigate the abundance distributions of silicon and iron on the surface of HR 7224 and ch...
© The Author(s) 2011. This article is published with open access at Springerlink.com Abstract We des...
We present a study of two spectral lines, Fe I 6173 °A and Ni I 6768 A° , that were candidates to be...
We present a study of two spectral lines, Fe I 6173 Angstroms and Ni I 6768 Angstroms, that were can...
Abstract A spectral line inversion code, Very Fast Inversion of the Stokes Vector (VFISV), ...
The Helioseismic and Magnetic Imager (HMI), on board the Solar Dynamics Observatory (SDO), will begi...
The Helioseismic and Magnetic Imager (HMI) began near-continuous full-disk solar measure-ments on 1 ...
We investigate the performance in the retrieval of the solar photospheric magnetic field vector usi...
Abstract We compare line-of-sight magnetograms from the Helioseismic and Magnetic Imager (HMI) onboa...
© The Author(s) 2011. This article is published with open access at Springerlink.com Abstract The He...
Context. The design of modern instruments does not only imply thorough studies of instrumental effec...
The Helioseismic and Magnetic Imager (HMI) (Scherrer & Schou 2010) is one of the three instrumen...
Context. The magnetic line ratio (MLR) method has been extensively used in the measurement of photos...
Abstract We investigate the accuracy to which we can retrieve the solar photospheric mag-netic field...
The Helioseismic and Magnetic Imager (HMI) instrument is a major component of NASA's Solar Dynamics ...
Aims:We investigate the abundance distributions of silicon and iron on the surface of HR 7224 and ch...
© The Author(s) 2011. This article is published with open access at Springerlink.com Abstract We des...
We present a study of two spectral lines, Fe I 6173 °A and Ni I 6768 A° , that were candidates to be...
We present a study of two spectral lines, Fe I 6173 Angstroms and Ni I 6768 Angstroms, that were can...
Abstract A spectral line inversion code, Very Fast Inversion of the Stokes Vector (VFISV), ...
The Helioseismic and Magnetic Imager (HMI), on board the Solar Dynamics Observatory (SDO), will begi...
The Helioseismic and Magnetic Imager (HMI) began near-continuous full-disk solar measure-ments on 1 ...
We investigate the performance in the retrieval of the solar photospheric magnetic field vector usi...
Abstract We compare line-of-sight magnetograms from the Helioseismic and Magnetic Imager (HMI) onboa...
© The Author(s) 2011. This article is published with open access at Springerlink.com Abstract The He...
Context. The design of modern instruments does not only imply thorough studies of instrumental effec...
The Helioseismic and Magnetic Imager (HMI) (Scherrer & Schou 2010) is one of the three instrumen...
Context. The magnetic line ratio (MLR) method has been extensively used in the measurement of photos...
Abstract We investigate the accuracy to which we can retrieve the solar photospheric mag-netic field...
The Helioseismic and Magnetic Imager (HMI) instrument is a major component of NASA's Solar Dynamics ...
Aims:We investigate the abundance distributions of silicon and iron on the surface of HR 7224 and ch...
© The Author(s) 2011. This article is published with open access at Springerlink.com Abstract We des...