NCAR

Impact of Thermospheric Wind Data Assimilation on Ionospheric Electrodynamics using a Coupled Whole Atmosphere Data Assimilation System

Colorful multiple grids of simulation experiments
Tuesday, March 1, 2022

The upward plasma drift and equatorial ionization anomaly (EIA) in the Earth's ionosphere are strongly influenced by the zonal electric field, which is generated by the wind dynamo.

On the (in)stability of sunspots

6 maps of the magnetic field strength
Wednesday, February 23, 2022

The stability of sunspots is one of the long-standing unsolved puzzles in the field of solar magnetism and the solar cycle.

Acoustic-gravity wave propagation characteristics in three-dimensional radiation hydrodynamic simulations of the solar atmosphere

6 colorful diagrams of various MURaM models
Wednesday, February 23, 2022

There has been tremendous progress in the degree of realism of three-dimensional radiation magneto-hydrodynamic simulations of the solar atmosphere in the past decades. Four of the most frequently used numerical codes are Bifrost, CO5BOLD, MANCHA3D and MURaM.

Efficient numerical treatment of ambipolar and Hall drift as hyperbolic system

6 graphs showing a two-dimensional test simulation setup
Wednesday, February 23, 2022

Partially ionized plasmas, such as the solar chromosphere, require a generalized Ohm's law including the effects of ambipolar and Hall drift.

NSF Approves Funding for COSMO Next Stage

Story Date: 2020-12-03

3rd Eddy Cross Disciplinary Symposium 2022

Jack Eddy with gray hair, smiling

Sun, Earth, Planet, Space, Atmosphere and Ocean–As our planet becomes one among many thousands of known worlds, our needs to understand how Earth’s space and climate react to our variable star grow in urgency.

Carolyn Jean Spellmann Shoemaker (1929–2021)

Carolyn Jean Spellmann Shoemaker (June 24, 1929–August 13, 2021) was a well known female astronomer. She was a co-discoverer of the Comet Shoemaker–Levy 9 and was credited with identifying 39 comets during her life time a number greater than any other individual at that time.

MHD-Test Particles Simulations of Moderate CME and CIR-Driven Geomagnetic Storms at Solar Minimum

Simulations
Thursday, December 2, 2021

Outer zone radiation belt electron flux is highly variable and responds differently to different solar wind drivers.

Charlotte Moore Sitterly (1898–1990)

Charlotte Moore Sitterly (24 Sep 1898–3 Mar 1990) was an American born astronomer known for her substantial spectroscopic research of the sun and chemical elements. Her data tables, known for their reliability, are still relevant today and referenced regularly.

Natalia Nikolayevna Stepanian (1931–2018)

Natalia Nikolayevna Stepanian lived until age 87 and was the oldest researcher at the Crimean Astrophysical Observatory (CrAO) when she died following a long illness.

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