Browse terms - alphabetical

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Term Definition Contributor Modified
umbra The dark core or cores (umbrae) in a sunspot with penumbra, or a sunspot lacking penumbra. Ryan McGranaghan 2023.04.16
Umbra A dark area, especially the blackest part of a shadow from which all light is cut off. Ryan McGranaghan 2023.04.16
Umbrellas and parasols No definition provided Christopher Rauch 2023.12.01
Umbriel The third largest and fourth most massivemoon of Uranus. Ryan McGranaghan 2023.04.16
Umohoite No definition provided Ryan McGranaghan 2023.04.16
unac A missing value code meaning that the value is temporarily inaccessible. John Kunze 2023.03.27
unacceptable No definition provided Ryan McGranaghan 2023.04.16
unal A missing value code meaning that the value is unallowed or suppressed intentionally. John Kunze 2023.03.27
unap A missing value code meaning that the value is not applicable or makes no sense. John Kunze 2023.03.27
unary operation No definition provided Ryan McGranaghan 2023.04.16
unas A missing value code meaning that the value is unassigned. John Kunze 2023.03.27
unav A missing value code meaning that the value is unavailable, possibly unknown. John Kunze 2023.03.27
Unbarred spiral galaxies No definition provided Ryan McGranaghan 2023.04.16
unbelievable No definition provided Ryan McGranaghan 2023.04.16
Unbreakable crust A hard snow surface lying upon a softer layer; may be formed by sun, rain or wind, and is described as breakable crust or unbreakable crust, depending upon weather it will break under the weight of a turning skier. GCW Glossary 2023.03.27
Uncalibrated Duplicate data are removed from the datastream and data are time ordered. Values are not adjusted for any potentialbiases or external factors. Similar to NASA Level 1. Ryan McGranaghan 2023.04.16
uncertain No definition provided Ryan McGranaghan 2023.04.16
uncertainty No definition provided Ryan McGranaghan 2023.04.16
Uncertainty A statistically defined discrepancy between ameasured quantity and the true value of that quantity that cannot becorrected by calculation or calibration. Ryan McGranaghan 2023.04.16
Uncertainty No definition provided Ryan McGranaghan 2023.04.16
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