Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...674l.109s&link_type=abstract
The Astrophysical Journal, Volume 674, Issue 2, pp. L109-L112.
Astronomy and Astrophysics
Astronomy
40
Sun: Corona, Sun: Coronal Mass Ejections (Cmes), Sun: Magnetic Fields
Scientific paper
The SECCHI HI2 white-light imagers on the STEREO A and B spacecraft show systematically different proper motions of material moving outward from the Sun in front of high-speed solar wind streams from coronal holes. As a group of ejections enters the eastern (A) field of view, the elements at the rear of the group appear to overrun the elements at the front. (This is a projection effect and does not mean that the different elements actually merge.) The opposite is true in the western (B) field; the elements at the front of the group appear to run away from the elements at the rear. Elongation/time maps show this effect as a characteristic grouping of the tracks of motion into convergent patterns in the east and divergent patterns in the west, consistent with ejections from a single longitude on the rotating Sun. Evidently, we are observing segments of the ``garden-hose'' spiral made visible when fast wind from a low-latitude coronal hole compresses blobs of streamer material being shed at the leading edge of the hole.
Battams K.
Burlaga Leonard Francis
Davila Jose Manuel
Davis Christopher J.
Esfandiari Ed
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