active prominence region
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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.