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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...

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Related Experiment Video

Updated: Jun 16, 2026

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)

Published on: August 4, 2018

White Light Coronagraph in OSO-7.

M J Koomen, C R Detwiler, G E Brueckner

|February 6, 2010

Summary

The Orbiting Solar Observatory 7 (OSO-7) coronagraph captured daily images of the white light corona, revealing transient events and constant solar changes over 2.75 years.

Area of Science:

Solar physics
Coronagraphy
Space-based solar observation

Background:

The study details a coronagraph designed for the Orbiting Solar Observatory 7 (OSO-7).
Previous solar observations lacked continuous, high-resolution data of the white light corona.

Purpose of the Study:

To describe the design and operation of the OSO-7 coronagraph.
To present findings on the dynamic nature of the solar corona.

Main Methods:

Utilized a small, externally occulted Lyot-type coronagraph on OSO-7.
Employed an SEC vidicon detector and a dedicated data system.
Integrated the instrument into the spacecraft for orbital operation.

Main Results:

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Last Updated: Jun 16, 2026

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy (oSLO) and Optical Coherence Tomography (OCT)

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Bringing the Visible Universe into Focus with Robo-AO

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Dual-mode Imaging of Cutaneous Tissue Oxygenation and Vascular Function

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Acquired daily images of the white light corona from 2.8 to 10 solar radii for 2.75 years.

Recorded the first observations of white light coronal transient events.

Demonstrated the continuously evolving nature of the solar corona.

Conclusions:

The OSO-7 coronagraph provided unprecedented long-term data on coronal dynamics.
Coronal transient events are a significant feature of solar activity.
The solar corona is a highly dynamic and variable environment.