An Arcade-like Eruptive Prominence

An eruptive prominence happened on the east-northern limb of the Sun on March 7,1991.It appeared in a relatively quiet region where any activity phenomena such as flare,filament and sunspot etc.was not found.The maximum height reachable of the prominence was 6.97×10⁴ km and its maximum length reached as 11.6×10⁴ km.The eruptive prominence might belong to the one of the middle-smaller scale according to its size in morphology.The course of the eruption exhibited some properties:ascending rapibly and descending slowly just like the process of the flare eruption.After the eruption,the most material in the prominence basically moved along a parabola under the action of magnetic force lines forming the arcade-like shape and keeping it till to the disappearance of the prominence.Before and after descending,a little matter came from the top part was ejected and divorced from the main body of the prominence and diffused into the interplanetary space.