Magnetic field

Role of Interaction Between Magnetic Rossby Waves and Tachocline Differential Rotation in Producing Solar Seasons

Synoptic maps
Wednesday, January 24, 2018

Mausumi Dikpati presents a nonlinear magnetohydrodynamic shallow-water model for the solar tachocline (MHD-SWT) that generates quasi-periodic tachocline nonlinear oscillations (TNOs) that can be identified with the recently discovered solar 'seasons'.

Examining the magnetic signal due to gravity and plasma pressure gradient current with the TIE-GCM

magnetic effect of gravity and plasma pressure gradient
Thursday, December 28, 2017

Astrid Maute states that accurate magnetic field measurements at ground and Low-Earth Orbit (LEO) are crucial to describe Earth's magnetic field. LEO data is also used to study the ionosphere.

Small-scale dynamo Simulations

Magnetic field amplification in exploding granules image
Wednesday, December 13, 2017

Magnetic field amplification in exploding granules and the role of deep and shallow recirculation

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.

Emergence of magnetic flux generated in a solar convective dynamo I

Evolution of the vertical component of the magnetic field
Friday, August 25, 2017

Formation of Sunspots and Active regions, and Origin of Their Asymmetries—We present a realistic numerical model of sunspot and active region formation based on the emergence of flux bundles generated in a solar convective dynamo.

Vector Magnetic Field Measurements Along A Cooled Stereo-Imaged Coronal Loop

Observed and inverted Stokes spectra
Tuesday, August 8, 2017

The variation of the vector magnetic field along structures in the solar corona remains unmeasured. 

Atomic Physics and Modern Solar Spectro-Polarimetry

Minimally processed Stokes spectra are shown for the 709.0 nm region
Tuesday, August 8, 2017

Observational solar physics is entering a new era with the advent of new 1.5 m class telescopes with adaptive optics, as well as the Daniel K. Inouye 4 m telescope which will become operational in 2019. Major outstanding problems in solar physics all relate to the solar magnetic field.

Are All Flare Ribbons Simply Connected to the Corona?

Magnetic data are shown for active region 11890
Friday, July 21, 2017

We consider the observational basis for the belief that flare ribbons in the chromosphere result from energy transport from the overlying corona. We study ribbons of modest flares using magnetic as well as intensity data from the Hinode, SDO and IRIS missions.

On the Fine Structure Splitting of the 3p43d4D5/2 and 3p43d4D7/2 Levels of FE X

Raw S082B image with wavelength scale
Friday, July 21, 2017

We study UV spectra obtained with the SO82-B slit spectrograph on board SKYLAB to estimate the fine structure splitting of the Cl-like 3p43d4D5/2 and 3p43d4D7/2 levels of Fe X.

Solar Spectral Lines w/ Special Polarization Properties for the Calibration of Instrument Polarization

Stokes profiles of the Fe I transition
Tuesday, May 9, 2017

We investigate atomic transitions that have previously been identified as having zero polarization from the Zeeman effect. Our goal is to identify spectral lines that can be used for the calibration of instrumental polarization of large astronomical and solar telescopes, such as the Daniel K.

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