The Relationship between Plasma Flow Velocities and Magnetic Field Parameters During the Emergence of Active Regions at the Solar Photospheric Level

Details The Relationship between Plasma Flow Velocities and Magnetic Field Parameters During the Emergence of Active Regions at the Solar Photospheric Level The Relationship between Plasma Flow Velocities and Magnetic Field Parameters During the Emergence of Active Regions at the Solar Photospheric Level

2012-04-20

arxiv.org/abs/1204.4536v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

13 pages, 8 figures. The results of article were presented at the ESPM-13 (12-16 September 2011, Rhodes, Greece) (Abstract Boo

Scientific paper

A statistical study has been carried out of the relationship between plasma flow velocities and magnetic field parameters during the emergence of active regions at the solar photospheric level with SOHO/MDI data. We have investigated 224 emerging active regions with different spatial scales and position on the solar disk. The following relationships for the first hours of the emergence of active regions have been analysed: i) maximum negative Doppler velocities with the position of the emerging active regions on the solar disk; ii) maximum velocities of upflow and downflow of substance with the flux growth rate and magnetic field strength for the active regions emerging in the central part of the solar disk (the vertical component of plasma flows); iii) maximum positive and negative Doppler velocities with the flux growth rate for the active regions emerging near the limb (the horizontal component of plasma flows); iiii) the flux growth rate with the density of emerging magnetic fields. We have compared magnetic field parameters and the velocities for the first hours of the appearance of active regions with the total magnetic flux at the maximum of their development.

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