Observations of the 3D coronal structure over a solar cycle

Huw Morgan, Shadia Rifai Habbal

Research output: Chapter in Book/Report/Conference proceedingConference Proceeding (Non-Journal item)


Solar rotational tomography is applied to almost eleven years of LASCO C2∕SOHO data, revealing for the first time the structural behavior of streamers over almost a full solar activity cycle. Streamers are most often shaped as extended, narrow plasma sheets. The sheets can be extremely narrow at times ( ⩽ 0.14×106 km at 4R☉). This is over twice their heliocentric angular thickness at 1 AU. For most of the activity cycle, streamers share the same latitudinal extent as filaments on the disk, showing that large‐scale stable streamers are closely linked to the same large‐scale photospheric magnetic configuration which give rise to large filaments. There is considerable differential rotation of streamers at high latitudes, which makes comparison between disk and coronal structure complicated. The presence of differential rotation has implications for many areas of coronal and heliospheric research.
Original languageEnglish
Title of host publicationAIP Conference Proceedings
Publication statusPublished - 01 Mar 2010
Event12th Internaltional Solar Wind Conference - Saint‐Malo, France
Duration: 21 Jun 200926 Jun 2009


Conference12th Internaltional Solar Wind Conference
Period21 Jun 200926 Jun 2009


Dive into the research topics of 'Observations of the 3D coronal structure over a solar cycle'. Together they form a unique fingerprint.

Cite this