Simulating Properties of “Seasonal” Variability in Solar Activity And Space Weather Impacts

The Van-Allen Radiation belt electron
Wednesday, April 21, 2021

Solar short-term, quasi-annual variability within a decadal sunspot-cycle has recently been observed to strongly correlate with major class solar flares, resulting into quasi-periodic space weather “seasons”.

Formation of Double Tongues of Ionization During the 17 March 2013 Geomagnetic Storm

Graphic image showing polar maps of the simulated electron density
Friday, October 2, 2020

During geomagnetic disturbances, enhanced high‐latitude convection transports ionospheric F2‐region plasma from the dayside midlatitude region into the polar cap, leading to structures such as tongues of ionization (TOIs) and patches.

Nature of Grand Minima and Maxima from Fully Non-Linear Flux-Transport Dynamos

Identified Grand Minima and Maxima
Thursday, September 7, 2017

We aim to investigate the nature and occurrence characteristics of grand solar minimum and maximum periods, which are observed in the solar proxy records such as 10Be and 14C, using a fully non-linear Babcock-Leighton type flux transport dynamo including momentum and entropy equations.

Driving Solar Giant Cells Through the Self-Organization of Near-Surface Plumes

Global 3D simulations of solar giant-cell convection.
Friday, March 24, 2017

Global 3D simulations of solar giant-cell convection have provided significant insight into the processes which yield the Sun’s observed differential rotation and cyclic dynamo action.

Dynamical downscaling simulation of gravity waves generation by tropical cycle

Downscaling simulation of gravity waves
Monday, August 15, 2016

National Center for Atmospheric Research Whole Atmosphere Community Climate Model (WACCM) with ≈0.25 degree horizontal resolution can resolve gravity waves with horizontal scales down to ≈250 km.

Convection in Oblate Solar-Type Stars

3D simulation image
Wednesday, July 13, 2016

We present the first global 3D simulations of thermal convection in the oblate envelopes of rapidly-rotating solar-type stars.

Arthur Richmond

Dr. Arthur D. Richmond is a Senior Scientist in the High Altitude Observatory at the National Center for Atmospheric Research. His research interests include upper atmospheric dynamics and electrodynamics. 

Identifying the Beginnings and Ends of Solar Cycles

Sun surface simulations image
Wednesday, January 4, 2012

HAO scientist's Mausumi Dikpati, Peter Gilman, Giuliana de Toma, and UCLA professor Roger Ulrich find that the latitude at which plasma sinking occurs is very important.

Maria Weber received an AGU Outstanding Student Paper Award

Rising Flux Tubes image
Tuesday, May 1, 2012

HAO graduate fellow Maria Weber received an AGU Outstanding Student Paper Award for her talk titled, "Comparing simulations of rising flux tubes through the solar convection zone with observations of active region properties: Constraining the dynamo field strength".

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.


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