active prominence region

[′ak·tiv ′präm·ə·nəns ‚rē·jən]

(astronomy)

Portions of the solar limb that display active prominences, characterized by down-flowing knots and streamers, sprays, frequent surges, and curved loops. Abbreviated APR.

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active location system
active logic
active margin
active master file
active master item
active material
active matrix
active matrix display
Active Measurement Project
Active Membership
active mirror
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Active noise control
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Active Reconfiguring Message
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Active Repeater
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Active Server Pages
active site
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Active solar
Active solar energy
active solar energy system
Active solar heating
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active solar system
Active solar water heater
active solid
active sonar
active sound attenuator
active sound cancellation
active sound control
Active Streaming Format
active substrate
active Sun
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Active Phased Array Radar
Active Phased-Array Antenna
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Active pixel sensor
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active placebo
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Active Plasma Experiment Satellite
active play
Active Pointer Present
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Active Position Return
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Active Power Factor Correction
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Active Programme Promoting Lifestyle Education in Schools
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Active Pulse Train
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Active Queue Management
Active Rack Isolation System
Active radar
Active Radar Array
Active Radar Array Antenna
Active radar homing
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Active radiator
Active Radio Frequency Cavity Amplifier
Active Radio Frequency Identification
Active Radio Interferometer for Explosion Surveillance
Active Range Clearance
Active Range Of Motion
Active Range Of Motion
Active Range of Motion Exercise
Active Ranging Sensor
Active Rebuilders and Restorers
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