Numerous data sets recorded simultaneously from multiple locations offer information-when these data sets are examined both individually and collectively-about the ionosphere at the time the data are taken. This measurement is prepared and recorded with open-source software. Space weather affects how far a signal travels before it changes direction, and the receiving station detects this as a change in signal frequency.Ĭomparing the received radio signal with a precision local frequency standard, such as a GPS-disciplined oscillator, allows a user to measure these ionospherically induced frequency shifts. Signals from radio station WWV reflect off the ionosphere in this illustration. This results in changes to the observed frequency of radio signals at receiving points, akin to the rise and fall in pitch of a passing train whistle. The various signals from WWV, reflecting off the ionosphere, undergo changes in path length as the ionospheric electron density profile changes. Radio signals provide a window into the changing ionosphere.
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