(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.
active prominence region
| Sci-Tech Dictionary: active prominence region |
(′ak·tiv ′präm·ə·nəns ′rē·jən)
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 | APR |
| List of radio propagation topics |
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