Magnetic field

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.

Mapping the magnetic field in the solar corona through magnetoseismology

Graphic image of magnetoseismology observations
Friday, August 14, 2020

Magnetoseismology, a technique of magnetic field diagnostics based on observations of magnetohydrodynamic (MHD) waves, has been widely used to estimate the field strengths of oscillating structures in the solar corona.

Global Maps of the Magnetic Field in the Solar Corona

Graphic image of magnetic field model

An international team led by solar physicists from Peking University, China and National Center for Atmospheric Research (NCAR), USA, has recently measured the global magnetic field of the solar corona for the first time.

Dynamics of Late-Stage Reconnection in the 2017 September 10 Solar Flare

Graphic depicting white light images
Tuesday, August 4, 2020

In this multi-instrument paper, we search for evidence of sustained magnetic reconnection far beyond the impulsive phase of the X8.2-class solar flare on 2017 September 10.

Neutral hydrogen, helium and solar and stellar coronae

Graphic image of Line Profiles of He I and He II Resonance Line
Wednesday, June 17, 2020

In the context of the solar atmosphere, we re-examine the role of of neutral and ionized species in dissipating the ordered energy of intermediate-mode MHD waves into heat.

Simulated trends in ionosphere-thermosphere climate due to predicted main magnetic field changes from 2015 to 2065

Photograph of TEC in 2015
Friday, May 15, 2020

Summary or Abstract: The strength and structure of the Earth's magnetic field is gradually changing. These changes do not only affect the difference between the geographic and magnetic pole, which we have to consider when we hike in higher latitude regions.

A distinct magnetic property of the inner penumbral boundary III. Analysis of simulated sunspots

Graphic image depicting radial profiles of continuum intensity
Friday, May 8, 2020

The analyses of sunspot observations revealed a fundamental magnetic property of the umbral boundary, the invariance of the vertical component of the magnetic field.

Statistical Dependence of EMIC Wave Scattering on Wave and Plasma Parameters

Graphic image of H+ band Electromagnetic Ion Cyclotron (EMIC) waves diagram
Friday, April 24, 2020

A recent statistical study has suggested that not all electromagnetic ion cyclotron (EMIC) waves can scatter relativistic electrons. However, knowledge of the factors that influence the EMIC wave scattering efficiency is still limited in observations.

Space Weather Challenge & Forecasting Implications Of Rossby Waves

Graph depicting solar magnetic weather
Tuesday, March 31, 2020

Rossby waves arise in thin layers within fluid regions of stars and planets. These global wave-like patterns occur due to the variation in Coriolis forces with latitude. In the past several years observational evidence has indicated that there are also Rossby waves in the Sun.

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