GENERATION OF MAGNETIC FIELDS BY PERFECTLY CONDUCTING FLUIDS. (1) Rafael de la Llave 2 3 Mathematics Department The University of Texas at Austin Austin TX 78712 Abstract. We study the spectrum of the operator describing the growth of magnetic elds in an in nitely conducting, incompressible uid. We show that, in many circumstances, it consists of an anulus and also give characterization of this...

Magnetoconvection simulations on mesogranule and granule scales near the solar surface are used to study the effect of convective motions on magnetic fields: the sweeping of magnetic flux into downflow lanes, the twisting of magnetic field lines, and the emergence and disappearance of magnetic flux tubes. Fromweak seed fields, convective motions produce highly intermittent magnetic fields in th...

At the time of the invention of DT-MRI (or DTI), I was employed as a Staff Fellow (a postdoctoral fellow position) in the Mechanical Engineering Section (MES) of the Biomedical Engineering and Instrumentation Branch (BEIB) in the Intramural Research Program (IRP) of the National Center for Research Resources (NCRR) of the National Institutes of Health (NIH). (People in the federal government li...

Although most of the magnetic flux observed on the sun originates in the low-latitude sunspot belts, this flux is gradually dispersed over a much wider range of latitudes by supergranular convective motions and meridional circulation. Numerical simulations show how these transport processes interact over the 11-year sunspot cycle to produce a strong "topknot" polar field, whose existence near s...

Magnetic levitation experiments have been performed on arabidopsis plants equipped with a stress responsive reporter gene system Seedlings were levitated in a magnetic eld gradient B T and BrB T m for hours and control specimens were located at the center of the magnet B T and in a low eld B mT region The reporter gene qualitatively indicates that the levitated and the magnetic eld control spec...

Using observations from the SOHO, STEREO and Hinode, we investigate magnetic field evolution in an equatorial coronal hole region. Two dipoles emerge one by one. The negative element of the first dipole disappears due to the interaction with the positive element of the second dipole. During this process, a jet and a plasma eruption are observed. The opposite polarities of the second dipole sepa...

It is generally believed that the magnetic free energy accumulated in the corona serves as a main energy source for solar explosions such as coronal mass ejections (CMEs). In the framework of the flux rope catastrophe model for CMEs, the energy may be abruptly released either by an ideal magnetohydrodynamic (MHD) catastrophe, which belongs to a global magnetic topological instability of the sys...

1109 No self-respecting concertgoer of a certain era would consider wearing earplugs at a show, but that was long before Pete Townsend and other rock icons spoke out about the risk of deafness. Today, most people recognize that highintensity noise causes hearing loss—except maybe for those iPod users who routinely blast earsplitting music straight into their brains. Blaring volume causes deafne...

Aims. We describe a new form of small-scale magnetic flux emergence in the quiet Sun. This process seems to take vertical magnetic fields from the solar interior to the photosphere, where they appear above granular convection cells. Methods. High-cadence time series of spectropolarimetric measurements obtained by Hinode in a quiet region near disk center are analyzed. We extract line parameters...

Forbes & Lin derived simple equations to link the properties of magnetic reconnection in the corona to observed signatures of solar flares. We measured the photospheric magnetic fields and the flare ribbon separation speeds then applied these equations to derive two physical terms for the magnetic reconnection rates: the rate of magnetic flux change ’rec involved in magnetic reconnection in the...