This note calculates the errors in the line-of-sight (LOS) magnetic field strength, the LOS velocity, and the plane-of-sky (POS) direction of the magnetic field from observations of the coronal Fe XIII emission line at 1074.7 nm in the presence of background light. The first part derives expressi... Show moreThis note calculates the errors in the line-of-sight (LOS) magnetic field strength, the LOS velocity, and the plane-of-sky (POS) direction of the magnetic field from observations of the coronal Fe XIII emission line at 1074.7 nm in the presence of background light. The first part derives expressions for the errors in the parameters as a function of the number of detected photons for a coronal emission line, assuming photon noise. The second part presents a flux budget for the coronal observations. The note concludes with plots of the expected errors in the magnetic field parameters as a function of the coronal intensity, the background intensity, and the coronagraph aperture. Show less
