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.
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Notes
The destretch part is generally applied; at this juncture the deblur algorithm is not performing well, and simply not applied.
NSO/Kitt Peak FTS data used here were produced by NSF/NOAO.
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Acknowledgements
We thank G. Nitta for his deft handling of the IVM operations, and distinctly remember an additional colleague whose vision and effort were fundamental to the IVM’s mission: Dr. Barry LaBonte. We also thank Dr. Richard C. Canfield for enabling the Imaging Vector Magnetograph to get funded and built; we acknowledge NASA grant NAGW-1454 and NSF ATM 8813157 for the IVM’s construction. We thank the referee for help clarifying the text and presentation. The work on Na i D1 data was supported by NASA grant NAG5-12466 and contract No. NNH09CE60C, by AFOSR contract F49620-03-C-0019, NSF National Space Weather Program Grant No. ATM-0519107, NSF SHINE grants ATM-0454610 and NSF Collaborative Research Grant ATM-0551055.
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Thomas R. Metcalf deceased, July 2007.
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Leka, K.D., Mickey, D.L., Uitenbroek, H. et al. The Imaging Vector Magnetograph at Haleakalā IV: Stokes Polarization Spectra in the Sodium D1 589.6 nm Spectral Line. Sol Phys 278, 471–485 (2012). https://doi.org/10.1007/s11207-012-9958-z
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DOI: https://doi.org/10.1007/s11207-012-9958-z