M. J. Hagyard
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View article: On a Cyclic Variation of the Hemispheric Helicity Rule
On a Cyclic Variation of the Hemispheric Helicity Rule Open
We report the result of a study of magnetic helicity in solar active regions during 1980-2000. Using the vector magnetograms from four instruments (Haleakala Stokes Polarimeter, Marshall Space Flight Center, Mitaka Solar Flare Telescope an…
View article: Magnetic field configuration associated with solar gamma ray flares in June, 1991
Magnetic field configuration associated with solar gamma ray flares in June, 1991 Open
The vector magnetic field configuration of the solar active region AR 6659 that produced very high levels of flare activity in Jun. 1991 is described. The morphology and evolution of the photospheric fields are described for the period 7-1…
View article: Optical synthesizer for a large quadrant-array CCD camera: Center director's discretionary fund
Optical synthesizer for a large quadrant-array CCD camera: Center director's discretionary fund Open
The objective of this program was to design and develop an optical device, an optical synthesizer, that focuses four contiguous quadrants of a solar image on four spatially separated CCD arrays that are part of a unique CCD camera system. …
View article: Flare onset at sites of maximum magnetic shear
Flare onset at sites of maximum magnetic shear Open
Observations of the transverse component of the Sun's photospheric magnetic field obtained with the MSFC vector magnetograph show where the fields are nonpotential. The correlation was studied between locations of nonpotential fields and s…
View article: The new MSFC Solar vector magnetograph. Center director's discretionary fund
The new MSFC Solar vector magnetograph. Center director's discretionary fund Open
The unique MSFC solar vector magnetograph allows measurements of all three components of the Sun's photospheric magnetic field over a wide field-of-view with spatial resolution determined by a 2.7 x 2.7 arc second pixel size. This system u…
View article: Calculation of the profiles of the Stokes parameters and the degree of line polarization - An application of the solutions of Moe to the Unno transfer equations
Calculation of the profiles of the Stokes parameters and the degree of line polarization - An application of the solutions of Moe to the Unno transfer equations Open
Calculating profiles of Stokes parameters and degrees of linear and circular polarization using narrow band birefringent filter
View article: Calculations of astrophysical partition functions
Calculations of astrophysical partition functions Open
Internal energy partition function of atom or ion immersed in plasma - astrophysical application