Snowden

A Snowden is a unit of soft X-ray emissivity, equivalent to 10−6 ROSAT counts s−1arcmin−2.[1] These units were chosen by S. L. Snowden when working with the ROSAT mission to create the ROSAT All-Sky Survey in order to make the surface brightness values fit into a two byte integer.

## References

1. ↑ The Local Leo Cold Cloud and New Limits on a Local Hot Bubble

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