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Extreme ultraviolet spectroheliograph ATM experiment S082A.

R Tousey, J D Bartoe, G E Brueckner

|February 20, 2010

Summary

The Apollo Telescope Mount experiment S082A XUV spectroheliograph provided detailed solar observations. This instrument achieved high spatial resolution for studying the sun's outer atmosphere.

Area of Science:

Solar Physics
Astronomy
Spectroscopy

Background:

The Apollo Telescope Mount (ATM) experiment S082A utilized a spectroheliograph for solar observations.
Understanding the sun's spectral characteristics requires advanced instrumentation.

Purpose of the Study:

To describe the XUV spectroheliograph (S082A) instrument.
To detail its capabilities and performance in a space environment.

Main Methods:

Employed a slitless Wadsworth grating spectrograph with photographic recording.
Utilized a 4-m radius grating with 3600 grooves/mm.
Achieved spectral ranges of 175-335 A and 320-480 A with 2-arc second spatial resolution.

Main Results:

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Covered spectral ranges from 171-335 A and 320-630 A with approximately 1020 exposures.

Spatial resolution of 2-arc seconds was achieved near the grating normal.

Resolution degraded to 10-arc seconds or worse at extreme spectral limits (e.g., 630 A).

Conclusions:

The S082A instrument was capable of high-resolution solar spectral imaging.
Detailed analysis of aberrations and space environment provisions were crucial for instrument reliability.