Flux

The eruption of a prominence carrying coronal flux rope forward synthesis of the magnetic field strength measurement by COSMOS

(a) The inferred line-of-sight (LOS) magnetic field B_LOS obtained from the forward synthesis of the circular polarization signal from the MHD model data at a time during the quasi-static phase of the flux rope; (b) The same as (a) but only show the pixels of the measured B_LOS with sufficient signal to noise ratio; (c) The axial field strength in the mid cross-section of the flux rope; (d) The 3D field lines of the coronal magnetic field as view
Tuesday, November 13, 2018

From a magnetohydrodynamic (MHD) simulation of the eruption of a prominence hosting coronal flux rope, Yuhong Fan and others carry out forward synthesis of the circular polarization signal (Stokes V signal) of the FeXIII emission line at 1074.7 nm produced by the MHD model.

Variability and predictability of the space environment as related to lower atmosphere forcing

Monthly mean, globally integrated total gravity wave flux of energy
Tuesday, April 4, 2017

Most of the large events affecting the thermosphere and ionosphere part of the space environment come from the Sun, the solar wind, and Earth’s magnetosphere, but even in “quiet time” periods lacking those sources of variability, conditions in the thermosphere and ionosphere continue to fluctuate

CME Initiation, Evolution, and Interplanetary Consequences

HAO scientists have carried out 3D isothermal MHD simulations of the evolution of the large scale coronal magnetic field as a twisted magnetic flux tube is driven (slowly) through the lower boundary into a pre-existing coronal arcade field.

Lisa Upton

Lisa is a Visiting Scientist here at HAO since September 2014 and also is currently working for Space Systems Research Corporation. In the spring of 2017, Lisa will begin a NSF postdoctoral fellowship at HAO, working as a collaborator with the dynamo group.

Lisa Upton, A Scientific Dynamo!

Lisa Upton

Lisa is a Visiting Scientist at HAO and also is currently working for Space Systems Research Corporation. In the spring of 2017, Lisa will begin a NSF postdoctoral fellowship at HAO, working as a collaborator with the dynamo group.

Slow appearance of sunspots challenges theory

HAO along with researchers from the Max Planck Institute for Solar System Research, The University of Göttingen, and NorthWest Research Associates have now shown that magnetic flux concentrations forming active regions on the sun emerge at a rate much slower than predicted by the prevailing curre

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.

A Tale of Two Emergences

Evolution figure
Wednesday, July 13, 2016

In June 2013, the two scientific instruments onboard the second Sunrise mission witnessed, in detail, a small-scale magnetic flux emergence event as part of the birth of an active region.

Differential Rotation in solar convective dynamo simulations

3D views of iso-surfaces
Monday, February 22, 2016

Fan and Fang's recent publication shows significant advances in global-scale fully dynamic 3D convective dynamo simulations of the solar convective envelope. These simulations demonstrate the role magnetic field plays in the self-consistent maintenance of the solar differential rotation.

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".

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