Long-Term Solar Variability - LSV

The Sun as a Dynamo

The ultimate origins of solar variability lie below the visible surface, where turbulent convection, differential rotation, and meridional flows work together to produce magnetic fields through the operation of a stellar dynamo, giving rise to the 22-year solar magnetic cycle.

Sunspots and Photospheric Dynamics

Sunspots are the most prominent manifestations of magnetic field in the visible layers of the solar atmosphere. Their origin is a dynamo process operating in the solar convection zone.

Magnetic Flux Emergence

Understanding the process of magnetic flux emergence through the solar convection zone is crucial for understanding the link between the observed magnetic activities at the surface and the dynamo-generated magnetic fields in the interior.

The Community Spectro-polarimetric Analysis Center (CSAC)

CSAC provides a suite of community resource tools for analysis of the precision polarization data for remote sensing of magnetic fields in the outer solar atmosphere.

Solar Convecton and Mean Flows

Any inquiry into the ultimate origins of solar magnetic activity must soon confront turbulent thermal convection. Convection is a means by which the Sun shines. Energy liberated by nuclear fusion deep in the core of the Sun filters outward by the diffusion of photons.


The FORWARD model is a suite of IDL and fortran codes that calculates simulated coronal polarization signals from numerical and analytical models of the corona.

Evaluating the Global Complexity of the Sun’s Magnetic Field

Thursday, September 26, 2013

Liang Zhao has authored an Astrophysical Journal paper titled "Two Novel Parameters to Evaluate the Global Complexity of the Sun’s Magnetic Field and Track the Solar Cycle".

Into Africa, A Scientist’s Journey

“Chui”was the word on the radio; Swahili for leopard. The Masai are still the best wildlife spotters on the Mara, but they are not averse to using modern technology when it suits them.

SDO/HMI Observations Create New Challenge

Solar-like differential rotation pattern

HAO's Mausumi Dikpati proposes thermal forcing as the likely candidate for meridional circulation flow braking.


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