Blobs Accelerate Slowly

Blobs Accelerate Slowly

. Time-lapse coronagraph images show prominent features, sometimes called blobs, that move radially out in equatorial regions from helmet streamers. Their speed typically doubles between 5 and 25 solar radii from the Sun, with a slow acceleration of about 4 meters per square second through most of this distance. This data was taken on 30 April 1996 with the SOHO LASCO instrument, at a time near a minimum in the 11-year solar activity cycle. The solid line denotes the best fit to the data using an exponential function starting at a distance of 4.5 solar radii from Sun center and with an asymptotic terminal speed of 418.7 thousand meters per second at a distance of about 15 solar radii from Sun center. [Courtesy of the SOHO LASCO consortium. SOHO is a project of international collaboration between ESA and NASA.]

Copyright 2010, Professor Kenneth R. Lang, Tufts University