Chromospheric Helium Imaging Photometer (an Instrument for High Time Cadence 1083-nm Wavelength Solar Observations).

Area of Science:

• Solar physics
• Astronomy
• Spectroscopy

Background:

• Observing the Sun in specific spectral lines is crucial for understanding solar phenomena.
• Previous instruments may have limitations in full-disk coverage or temporal resolution.

Purpose of the Study:

• To describe the motivation, design, and specifications of a new ground-based solar instrument.
• To detail the technical aspects, including optical, mechanical, and data processing features.
• To summarize the initial performance of the instrument.

Main Methods:

• Utilizing a liquid-crystal tunable Lyot-type spectral filter for precise wavelength selection.
• Employing an array detector for capturing the entire solar disk.
• Implementing a high-altitude telescope design for optimal atmospheric conditions.
• Developing computer interfaces and data-reduction procedures for efficient analysis.

Main Results:

• The instrument successfully achieves full-disk solar observations in the He I 1083-nm line.
• High-cadence observations with a time resolution of minutes are feasible.
• Initial operational year data confirms instrument functionality and performance.

Conclusions:

• The new instrument is a valuable tool for solar research, particularly for studying the He I 1083-nm spectral line.
• Its design enables detailed, high-cadence observations of the solar disk.
• The instrument's performance indicates its suitability for ongoing solar studies.