Plausible Model for the Fast Solar Wind Accelerated Plasma Within and Below a Polar Plume, from SDO and SWAP Observations

We present observation of polar coronal hole plumes with foot point jets that shows evidence of longitudinal acceleration. The series of event, occurring in the north coronal hole on 10 July 2010, was observed by the AIA telescopes of the Solar Dynamic Observatory (SDO mission) in the EUV lines, with unprecedented details. The structures along the plume show a propagating outward velocity of about 120-140 km/s. A visual study of the dynamic behavior using time-slice diagrams reveals that a large amount of very fast ejected material could be originated from below of the polar plume. These Jets erupt along plumes from the surrounding areas, producing twisty motion. According to a naïve ring model for plumes, the release of plasma materials is expected from a hollow cylinder with parallel walls. Eruptions sequentially and successively occur but not periodicity is observed. After the initial phase the longitudinal acceleration and speed substantially reduces and disperses in the environment. These observations suggest the existence of a confined magnetic annulus in plumes. The dynamical behavior is illustrated using more AIA (SDO mission) data. It includes a helical or swirl and an untwisting mechanism possibly responsible for the launch and the acceleration of plasma and of Alfven waves similar to a tornado occurring along the polar plume.