Since its introduction to astro-and solar physics, the concept of helicity has proven to be
useful in providing critical insights into physics of various processes from astrophysical …

Mounting observational evidence of the emergence of twisted magnetic flux tubes through
the photosphere have now been published. Such flux tubes, formed by the solar dynamo …

The source of coronal magnetic energy and helicity lies below the surface of the Sun,
probably in the convective zone dynamo. Measurements of magnetic and velocity fields can …

Virtually all X-class flares produce a coronal mass ejection (CME), and each CME carries
magnetic helicity into the heliosphere. Using magnetograms from the Michelson Doppler …

We studied the current helicity of 230 active regions on the Sun during the period of 1992–
2001. Vector magnetograms used were obtained with the Solar Flare Telescope, located at …

Applying the same methods we used in solar cycle 22, we study active region vector
magnetograms, full-disk X-ray images, and full-disk line-of-sight magnetograms to derive the …

Magnetic helicity quantifies how the magnetic field is sheared and twisted compared to its
lowest energy state (potential field). Such stressed magnetic fields are usually observed in …

Shearing motions have been frequently used in MHD simulations of coronal mass ejection
(CME) initiation but have hardly been reported from observations of CME-producing regions …

The hemispheric sign rule of helicity and its long-term variation were studied. The data were
obtained from the Solar Flare Telescope at Mitaka and the 65-cm solar telescope at …

Magnetic clouds (MCs), and more generally, interplanetary coronal mass ejections (ICMEs),
are believed to be the interplanetary counterparts of CMEs. The link has usually been shown …