Can we Determine Electric Fields and Poynting Fluxes from Vector Magnetograms and Doppler Measurements?

Details Can we Determine Electric Fields and Poynting Fluxes from Vector Magnetograms and Doppler Measurements? Can we Determine Electric Fields and Poynting Fluxes from Vector Magnetograms and Doppler Measurements?

2011-01-21

arxiv.org/abs/1101.4086v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Solar Physics, in press. 14 pages, 3 figures

Scientific paper

The availability of vector magnetogram sequences with sufficient accuracy and cadence to estimate the time derivative of the magnetic field allows us to use Faraday's law to find an approximate solution for the electric field in the photosphere, using a Poloidal-Toroidal Decomposition (PTD) of the magnetic field and its partial time derivative. Without additional information, however, the electric field found from this technique is under-determined -- Faraday's law provides no information about the electric field that can be derived the gradient of a scalar potential. Here, we show how additional information in the form of line-of-sight Doppler flow measurements, and motions transverse to the line-of-sight determined with ad-hoc methods such as local correlation tracking, can be combined with the PTD solutions to provide much more accurate solutions for the solar electric field, and therefore the Poynting flux of electromagnetic energy in the solar photosphere. Reliable, accurate maps of the Poynting flux are essential for quantitative studies of the buildup of magnetic energy before flares and coronal mass ejections.

Affiliated with

Also associated with

No associations

Rating

Can we Determine Electric Fields and Poynting Fluxes from Vector Magnetograms and Doppler Measurements? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Can we Determine Electric Fields and Poynting Fluxes from Vector Magnetograms and Doppler Measurements?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Can we Determine Electric Fields and Poynting Fluxes from Vector Magnetograms and Doppler Measurements? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-18787