The recent quiet solar cycle has invited new questions as to the nature of the solar magnetic field and how it changes over time. To investigate this, we use the National Solar Observatory’s McMath-Pierce Solar Telescope Facility (McMP) and Dunn Solar Telescope (DST) to compare measurements of sunspots from five active regions observed in 2013. Both BABO at the McMP and FIRS at the DST were used to provide spectra of the Fe 1564.8nm line, which is affected by the presence of magnetic fields. The magnetic field is derived from Zeeman splitting in Stokes-I by BABO, and by inversion of the Stokes parameters from FIRS data allowing for comparisons of sunspot properties between the two instruments.. We present the first results from this study including the magnetic fields in sunspot umbrae from five active regions measured simultaneously by BABO and FIRS.
American Astronomical Society Meeting Abstracts #224
- Pub Date:
- June 2014