Active(abbrev. ACTV). In solar-terrestrial terms, solar activity levels with at least one geophysical event or
several larger radio events (10cm) per day (Class M Flares)Active Conservation StorageIn hydrologic terms, the portion of water stored in a reservoir that can be released for all useful purposes such as municipal water supply, power, irrigation, recreation, fish, wildlife, etc. Conservation storage is the volume of water stored between the inactive pool elevation and flood control stage. Active Dark Filament (ADF)In solar-terrestrial terms, an Active Prominence seen on the Disk.Active LongitudeIn solar-terrestrial terms, the approximate center of a range of heliographic longitudes in which Active Regions are more numerous and more flare-active than the average.Active ProminenceIn solar-terrestrial terms, a prominence displaying material motion and changes
in appearance over a few minutes of time.Active Prominence Region (APR)In solar-terrestrial terms, a portion of the solar limb displaying active prominences.Active Region (AR)In solar-terrestrial terms, a localized, transient volume of the solar atmosphere in which plages, sunspots, faculae, flares, etc. may be observed.Active Storage CapacityIn hydrologic terms, the total amount of reservoir capacity normally available for release from a reservoir below the maximum storage level. It is total or reservoir capacity minus inactive storage capacity. More specifically, it is the volume of water between the outlet works and the spillway crest. Active Surge Region (ASR)In solar-terrestrial terms, an Active Region that exhibits a group or
series of spike-like surges that rise above the limb.Inactive Storage CapacityIn hydrologic terms, the portion of capacity below which the reservoir is not normally drawn, and which is provided for
sedimentation, recreation, fish and wildlife, aesthetic reasons, or for the creation of a minimum controlled operational or power head in
compliance with operating agreements or restrictions.Refractive IndexA measure of the amount of refraction. Numerically equal to the ratio of wave velocity in a vacuum to a wave speed in the medium, i.e., n = c / v
where: v is actual speed, and c is speed of light in a vacuum.
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