Magnetic field

The enduring mystery of the solar corona

Magnetic field lines
Thursday, September 16, 2021

The author reviews why, after almost 8 decades, we still have a coronal heating problem.

Why do we still have a coronal heating problem

The solar corona photographed by Miloslav Druckmüller from Brno University of Technology in the Czech Republic during the 2020 total eclipse over Argentina

After almost 8 decades, astronomers still debate the reasons why the Sun and sun-like stars must possess coronae. Philip Judge re-examines the problem and compares it to that of a detective trying to find the lead pipe or smoking gun at the scene of a murder.

Climate Changes in the Upper Atmosphere: Contributions by the Changing Greenhouse Gas Concentrations and Earth's Magnetic Field From the 1960s to 2010s

Graph depicting Simulated thermosphere and ionosphere temperatures at 300 km in the 1960s
Wednesday, June 23, 2021

Previous studies have established the importance of the increasing greenhouse gas concentrations in causing trends in the thermosphere and ionosphere (T-I). Recent work indicates that the changing Earth’s magnetic field is also important.

Atomic structure calculations of Land ́e g factors of astrophysical interest with direct applications for solar coronal magnetometry

Non-relativistic Land ́e g factor
Thursday, May 6, 2021

We perform a detailed theoretical study of the atomic structure of ions with ns2npm ground configurations and focus on departures from LS coupling which directly affect the Land ́e g factors of magnetic dipole lines between levels of the ground terms.

Measuring the magnetic origins of solar flares, CMEs and Space Weather

A UV spectrum of α Cen A
Wednesday, April 21, 2021

We take a broad look at the problem of identifying the magnetic solar causes of space weather.

Modeling Diurnal Variation Magnetic Fields for Mantle Induction Studies

Graphic image of the magnetic Bx component
Thursday, January 28, 2021

Accurate models of the spatial structure of ionospheric magnetic fields in the daily variation (DV) band (periods of approximately a few hours to a day) would enable use of magneto-variational methods for three-dimensional imaging of upper mantle and transition zone electrical conductivity.

NSF APPROVES FUNDING FOR COSMO

The COSMOS observatory

The National Center for Atmospheric Research (NCAR) has received funding approval to survey prospective locations for the Coronal Solar Magnetism Observatory (COSMO).

Superstrong photospheric magnetic fields in sunspot penumbrae

Graphic image showing a portion of the inner penumbra in the MURaM sunspot simulation
Friday, October 2, 2020

Recently, there have been some reports of unusually strong photospheric magnetic fields (which can reach values of over 7 kG) inferred from Hinode SOT/SP sunspot observations within penumbral regions.

Dipolar elementary current systems for ionospheric current reconstruction at low and middle latitudes

Graphic image showing the maps of the E-region horizontal and radial currents
Friday, October 2, 2020

The flow of ionospheric current can be probed by examining magnetic field measurements at the ground and at Low-Earth-Orbit (LEO) altitude.

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