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New Slough Ionosonde Data Available for 1930s and 1940s

The Slough/Chilton data set has been extend backwards in time by revisiting original records from the 1930s and 1940s Slough ionosonde data. Data from more soundings are available in this extended data set. Also provided is a caveat to assist in understanding the nature of ionospheric measurements at this time.

These data can be accessed in the normal way by visiting the Ionosonde Data Retrieval page.