Physics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jhu..reptq....r&link_type=abstract
Final Report, 1 Dec. 1986 - 30 Apr. 1990 Johns Hopkins Univ., Laurel, MD. Applied Physics Lab.
Physics
Solar Cycles, Solar Flares, Solar Interior, Solar Magnetic Field, Solar Physics, Solar Spectra, Sun, Sunspots, Circular Polarization, Doppler Effect, Line Spectra, Linear Polarization, Lithium Niobates, Optical Filters, Spectral Resolution, Velocity Measurement
Scientific paper
New instruments have been installed at observatories in New Mexico and California for measuring solar magnetic fields and surface velocities. The magnetic fields provide the energy for all eruptive and accelerative processes on the Sun, and the surface velocities reveal the dynamics of the solar interior. Early detection of emerging magnetic fields may give several hours' warning of impending solar flares and interplanetary shocks. The new instruments incorporate several technical innovations, including lithium niobate filter for high spectral resolution. With this filter, circular and linear polarization and Doppler shifts are measured in solar spectral lines to yield estimates of the magnetic field vector in active sunspot regions. A program of daily measurements is planned for study of the current peak in the 11-year solar cycle.
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