Bibcode
Balthasar, Horst; Collados, Manuel; Muglach, Karin
Referencia bibliográfica
In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000, Santa Cruz de Tenerife, Tenerife, Spain. Edited by A. Wilson, Scientific coordination by P. L. Pallé. ESA SP-464, Noordwijk: ESA Publications Division, ISBN 92-9092-697-X, 2001, p. 163 - 167
Fecha de publicación:
1
2001
Número de citas
4
Número de citas referidas
3
Descripción
In order to investigate the oscillatory behaviour of the magnetic field
in sunspots and pores, full Stokes measurements of 1.56 μm iron lines
have been performed using the Tenerife Infrared Polarimeter (TIP) at the
German Vacuum Tower Telescope on Tenerife. As expected, velocity
oscillations have power peaks at five minutes. First results for
temporal variations of the magnetic field show that they occur in
locally restricted areas in sunspots. Periods in the five minute range
are preferred. In addition, we investigate magnetograms taken with the
Michelson Doppler Imager (MDI) on SOHO. Intensity images in white light
and around 160 nm were obtained with TRACE as well. Intensity power is
strongly with TRACE as well. Intensity power is strongly suppressed in
the sunspot area, although we find powerpeaks in the five and three
minute ranges.