Tuesday, 23 September 2014

Long-lived filament!

First noted on 2014 Jul31 (Fig LHS) a northern filament tracked across the disc (shaded grey, 6 logs) until it reached the western limb, becoming a fine prominence on Aug 10. Out of sight for two weeks it apparently survived far-side transit, to reappear as a larger prominence at the east limb on Aug24.
        It now began a second transit (dotted red), having it seems migrated a few degrees northward -but otherwise at the same longitude. This transit ended in a slow ejection on Sep 2, during my night time. The two dotted outlines are data from the GONG network. Did the filament channel survive the ejection? Wait and see.