Physics – Optics
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994uhi..rept.....m&link_type=abstract
Final Technical Report, 1 Nov. 1988 - 31 Oct. 1994 Hawaii Univ., Honolulu, HI. Inst. for Astronomy.
Physics
Optics
Acousto-Optics, Bandpass Filters, Lyman Alpha Radiation, Solar Flares, Solar Instruments, Solar Protons, Tuning, Ultraviolet Filters, Line Spectra, Narrowband, Single Crystals, Solar Spectra
Scientific paper
The goal of this project was to develop and characterize a narrow-band, tunable filter for use near the Lyman-alpha line of hydrogen at 121.6 nm. Such a filter could form the critical component of an instrument to observe asymmetries in the solar Lyman-alpha line, caused by energetic protons accelerated during the impulsive phase of solar flares. Characteristic charge-exchange nonthermal emission at Lyman alpha should be produced when sub-MeV protons are injected into the chromosphere, but no instrument suitable for their detection has been developed. Such an instrument would require a narrow-band (less than 0.01 nm) tunable filter with aperture and throughput consistent with imaging a solar active region at 0.1 second intervals. The development of acousto-optic tunable filters (AOTF) suitable for use as compact, simple tunable filters for astronomical work suggested an investigation into the use of an AOTF at Lyman-alpha.
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