Astrophysics is a highly important part of the modern vision of the world around us. Over the
past century, it has transformed the very foundation and basic philosophical concepts on the …

Magnetic fields extend from the solar interior through the atmosphere. The formation and
evolution of active regions can be studied by measuring subsurface flows with local …

Abstract Using Helioseismic and Magnetic Imager/Solar Dynamics Observatory data, we
search for a relationship between kinetic helicity and magnetic helicity in solar active regions …

Solar physics is a fundamental branch of astrophysics, which has a long history. People
have noticed the activity of the sun for a long time. For example, as early as 3000 years ago …

We study long-lived activity complexes and their current helicity at the solar surface and their
kinetic helicity below the surface. The current helicity has been determined from synoptic …

We compare the average photospheric current helicity H c, photospheric twist parameter α
(a well-known proxy for the full relative magnetic helicity), and subsurface kinetic helicity H k …

An investigation on correlations between photospheric current helicity and subsurface
kinetic helicity is carried out by analyzing vector magnetograms and subsurface velocities for …

We search for a signature of helicity flow from the solar interior to the photosphere and
chromosphere. For this purpose, we study two active regions, NOAA 11084 and 11092, that …

We study the hemispheric distribution of the kinetic helicity of subsurface flows in the near-
surface layers of the solar convection zone and its variation with magnetic activity. We …

We analyze the topology of photospheric magnetic fields and sub-photospheric flows of
several active regions (ARs) that are observed during the peak to descending phase of …