5 papers · 1 filter
SOLIS Vector Spectromagnetograph: status and science
C. J. Henney, C. U. Keller, J. W. Harvey +5
The Vector Spectromagnetograph (VSM) instrument has been recording photospheric and chromospheric magnetograms daily since August 2003. Full-disk photospheric vector magnetograms a…
Automatic Active-Region Identification and Azimuth Disambiguation of the SOLIS/VSM Full-Disk Vector Magnetograms
M. K. Georgoulis, N. -E. Raouafi, C. J Henney
The Vector Spectromagnetograph (VSM) of the NSO's Synoptic Optical Long-Term Investigations of the Sun (SOLIS) facility is now operational and obtains the first-ever vector magneti…
Magnetic Energy and Helicity Budgets in the Active-Region Solar Corona. I. Linear Force-Free Approximation
M. K. Georgoulis, Barry J. LaBonte
We self-consistently derive the magnetic energy and relative magnetic helicity budgets of a three-dimensional linear force-free magnetic structure rooted in a lower boundary plane.…
Turbulence in the Solar Atmosphere: Manifestations and Diagnostics via Solar Image Processing
Manolis K. Georgoulis
Intermittent magnetohydrodynamical turbulence is most likely at work in the magnetized solar atmosphere. As a result, an array of scaling and multi-scaling image-processing techniq…
Reconstruction of an Inductive Velocity Field Vector from Doppler Motions and a Pair of Solar Vector Magnetograms
Manolis K. Georgoulis, Barry J. LaBonte
We outline a general methodology to infer the inductive velocity field vector in solar active regions. For the first time, both the field-aligned and the cross-field velocity compo…