The Imaging Vector Magnetograph at Haleakalā IV: Stokes Polarization Spectra in the Sodium D1 589.6 nm Spectral Line
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- 作者：K. D. Leka (1) leka@cora.nwra.com
Donald L. Mickey (2)
Han Uitenbroek (3)
Eric L. Wagner (1)
Thomas R. Metcalf (1) - 关键词：Sun ; chromosphere – Observations – Polarimetry – Data analysis
- 刊名：Solar Physics
- 出版年：2012
- 出版时间：June 2012
- 年：2012
- 卷：278
- 期：2
- 页码：471-485
- 全文大小：1.2 MB
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- 刊物类别：Physics and Astronomy
- 刊物主题：Physics
Astronomy
Extraterrestrial Physics and Space Sciences
Astrophysics - 出版者：Springer Netherlands
- ISSN：1573-093X
文摘
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.