Development of ultrastable filters and lasers for solar seismology.
Abstract
The Stable Solar Analyzer is a recently developed instrument for the measurement of solar magnetic fields and surface velocities that is being employed at the U.S. National Solar Observatory to study the subsurface convection cells of the sun and the structure of surface and subsurface magnetic fields. The Analyzer is expected to ultimately be flown aboard such spacecraft as the ESA/NASA Solar and Heliospheric Observatory. This instrument is based on a crystalline lithium niobate Fabry-Perot filter that is used in conjunction with a stabilized laser that furnishes an absolute wavelength reference; this laser Fabry-Perot combination has achieved wavelength stabilities of the order of 2 parts in 10 to the 10th, over a six-hour interval.
- Publication:
-
Johns Hopkins APL Technical Digest
- Pub Date:
- June 1986
- Bibcode:
- 1986JHATD...7..209R
- Keywords:
-
- Crystal Filters;
- Helioseismology;
- Lasers;
- Optical Filters;
- Acoustic Frequencies;
- Acoustic Measurement;
- Soho Mission;
- Solar Observatories;
- Astronomy;
- Methods of Observation:Solar Oscillations;
- Solar Oscillations:Methods of Observation