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Related Experiment Video

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Bringing the Visible Universe into Focus with Robo-AO

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Light flashes observed by astronauts on skylab 4.

L S Pinsky, W Z Osborne, R A Hoffman

Science (New York, N.Y.)

|May 30, 1975

Summary

Astronauts observed light flashes correlating with cosmic rays and the South Atlantic Anomaly (SAA). Findings suggest a potential new source of radiation in the SAA, possibly multiply charged nuclei.

Area of Science:

Space physics
Astronomy
Cosmic ray physics

Background:

Light flashes observed by astronauts can provide insights into space radiation.
The Skylab 4 mission offered a unique platform for dedicated astronomical observations.
The South Atlantic Anomaly (SAA) is a region of intense radiation in Earth's inner Van Allen belt.

Purpose of the Study:

To analyze astronaut observations of light flashes during the Skylab 4 mission.
To investigate the correlation between light flash frequency and cosmic-ray flux.
To determine the relationship between light flashes and the South Atlantic Anomaly (SAA) radiation environment.

Main Methods:

Dedicated light flash observing sessions conducted by a Skylab 4 crewman.
Analysis of observed flash frequency.

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Correlation analysis between flash frequency, cosmic-ray flux, and SAA radiation levels.

Calculations to model potential radiation sources.

Main Results:

A strong correlation was found between the frequency of observed light flashes and primary cosmic-ray flux.
An even stronger correlation was identified between flash frequency and the SAA region.
Calculations suggest that an all-proton inner belt cannot account for the observed SAA flash rates.

Conclusions:

The observed light flashes are strongly linked to space radiation, particularly within the SAA.
The data indicate that the current models of the inner belt radiation may be incomplete.
A previously unobserved flux of multiply charged nuclei in the inner belt is suggested as a possible explanation for the SAA flash rate.