Solar Physics

, Volume 278, Issue 2, pp 471–485

The Imaging Vector Magnetograph at Haleakalā IV: Stokes Polarization Spectra in the Sodium D1 589.6 nm Spectral Line

  • K. D. Leka
  • Donald L. Mickey
  • Han Uitenbroek
  • Eric L. Wagner
  • Thomas R. Metcalf
Article

DOI: 10.1007/s11207-012-9958-z

Cite this article as:
Leka, K.D., Mickey, D.L., Uitenbroek, H. et al. Sol Phys (2012) 278: 471. doi:10.1007/s11207-012-9958-z

Abstract

The Imaging Vector Magnetograph (IVM) at the Mees Solar Observatory, Haleakalā, Maui, Hawai’i, obtained many years of vector magnetic-field data in the photospheric Fe i 630.25 nm line. In the latter period of its operation, the IVM was modified to allow routine observations in the chromospheric Na i D1 line, as well as the Fe i line. We describe the sodium observational data in detail, including the data-reduction steps that differ from those employed for the Fe i 630.25 nm line, to obtain calibrated Stokes polarization spectra. We have performed a systematic comparison between the observational data and synthetic NLTE Na i D1 Stokes spectra derived for a variety of solar-appropriate atmospheric and magnetic configurations. While the Na i D1 Stokes polarization signals from the solar atmosphere are expected to be weak, they should generally be within the IVM capability. A comparison between synthetic spectra and observational data indicates that this is indeed the case.

Keywords

Sun: chromosphereObservationsPolarimetryData analysis

Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • K. D. Leka
    • 1
  • Donald L. Mickey
    • 2
  • Han Uitenbroek
    • 3
  • Eric L. Wagner
    • 1
  • Thomas R. Metcalf
    • 1
  1. 1.Colorado Research Associates OfficeNorthWest Research AssociatesBoulderUSA
  2. 2.Institute for AstronomyUniversity of Hawai’iHonoluluUSA
  3. 3.National Solar ObservatorySunspotUSA