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A balloon-borne infrared coronagraph.

|January 14, 2010

Summary

This summary is machine-generated.

A stratospheric balloon-borne coronagraph successfully observed the outer solar corona at 2.2 micrometers. This study details the instrument

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Area of Science:

Solar physics
Astronomy
Optical instrumentation

Background:

Observing the outer solar corona requires specialized instruments to minimize stray light.
Stratospheric balloon platforms offer advantages for solar observation by reducing atmospheric interference.

Purpose of the Study:

To successfully deploy and operate a stratospheric balloon-borne coronagraph for outer solar corona observation.
To characterize stray light origins and wavelength dependence within the instrument.

Main Methods:

Utilized a coronagraph with external occultation (three straight edges) and an axial Lyot component.
Employed a scanning mechanism involving rotation of the rear Lyot section.
Conducted stray light measurements at 0.5, 0.8, and 2.2 micrometers.

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Main Results:

Successfully obtained observations of the outer solar corona at 2.2 micrometers.
Identified origins of stray light within the coronagraph system.
Deduced a wavelength dependence for scattered light originating from the objective lens.

Conclusions:

The stratospheric balloon-borne coronagraph is a viable instrument for outer solar corona studies.
Understanding and minimizing stray light is critical for accurate coronal observations.
The instrument's design and measurement capabilities were validated.