Photospheric background Doppler velocity field during the development of active regions

Details Photospheric background Doppler velocity field during the development of active regions Photospheric background Doppler velocity field during the development of active regions

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535...71b&link_type=abstract

In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2

Physics

Solar Photosphere, Velocity Fields

Scientific paper

We investigate changes of the photospheric background Doppler velocity field, measured by a scanning photoelectric magnetograph during the development of several active regions. Our results demonstrate that the whole local system of an active region's magnetic and motion field represents some kind of disturbance of the semiregular motion patterns of the quiet photosphere which seem to have their physical background in the local strengthening of convection and the local concentration of the magnetic field. In such a local Doppler motion system, the positive (blue-shifted) Doppler motion elements are considerably diluted (with the exception of Evershed's positive motion areas and the active region's surroundings), while the negative (red-shifted) elements are strongly concentrated, parallel with the distribution of the local magnetic field. At the same time, they are cellularly organized. The circulation below an active region and its surroundings forms a complicated system of mutually related motions bound together by the magnetic field.

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