theartist Posted August 22, 2019 Share Posted August 22, 2019 (edited) Multi-Rotation Persistent Magnetic Structure ('Persistent MS') This document looks at some magnetic field structures on the surface of the sun that persisted for multiple solar rotations during this current solar minimum period. PFSS descriptive text(source). Source of imagery in following animations. --------------------- ------- --------------------- CASE 1 Features that stand out persistently (depicted in the next image) between rotations are: large 'open areas' of opposing magnetic polarity; consistent field line angles between the 'open areas'. --------------------- ------- --------------------- CASE 1 animation: 5/26/18 through 01/23/19; Nine Rotations: START, Rotation 0, 5/26/18; Rotation 1, 6/22/18; Rotation 2, 7/19/18; Rotation 3, 8/15/18; Rotation 4, 9/11/18; Rotation 5, 10/08/18; Rotation 6, 11/04/18; Rotation 7, 12/01/18; Rotation 8, 12/27/18; Rotation 9, 01/23/19. In the above animation, the large magnetic structure that had repeated for eight rotations was broken and dispersed by Rotation 9, when other magnetic structure took predominance. Edited August 27, 2019 by theartist Link to comment Share on other sites More sharing options...
theartist Posted August 27, 2019 Author Share Posted August 27, 2019 --------------------- ------- --------------------- CASE 2 CASE 2 animation: 3/19/19 through 08/26/19; Six Rotations: START, Rotation 0, 3/19/19; Rotation 1, 4/13/19; Rotation 2, 5/10/19; Rotation 3, 6/06/19; Rotation 4, 7/03/19; Rotation 5, 7/30/19; Rotation 6, 8/26/19. Link to comment Share on other sites More sharing options...
theartist Posted September 16, 2019 Author Share Posted September 16, 2019 (edited) The trans-equatorial coronal hole that developed east (to the left) of the persistent magnetic structure discussed for 'Case 2' in this thread was earth facing on 2019.08.27-2019.08.31; its associated Geomagnetic disturbance date interval was 2019.08.30-2019.09.05 and it produced a Max solar wind speed of 872 km/s (reference www.solen.info ). Here are other thread discussions related to this persistent magnetic structure and associated coronal hole(s): Coronal Hole Occlusion Coronal Hole Polarity & Planetary Magnetic Connection. Edited September 16, 2019 by theartist added content Link to comment Share on other sites More sharing options...
theartist Posted September 16, 2019 Author Share Posted September 16, 2019 (edited) In addition, if I'm not mistaken, that area of solar disk containing the persistent magnetic structure discussed above for 'Case 2', is also responsible for producing the 'Stealthy CME' in the following thread: Evolution of a "Stealthy CME". Nope, sorry, this last statement is not necessarily true. The 'Stealthy CME' discussed in that thread occurred on 08/13/19, and only the first of the coronal holes straddling the persistent magnetic structure had appeared in the STEREO-A frame by that date, per the image below: Edited September 16, 2019 by theartist Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now