Proposal ID Brajsa_206

Date of Proposal Mar 23 1999

firstname

Roman

lastname

Brajsa

institute

Hvar Observatory

address

Faculty of Geodesy, University of Zagreb
Kaciceva 26
HR-10000 Zagreb
Croatia

email

romanb@geodet.geof.hr

phone

fax

proposal

Proposers: R. Brajsa (1), B. Vrsnak (1), V. Ruzdjak (1), D. Rosa (2),
H. Woehl (3), F. Clette (4)

(1) Hvar Observatory, Faculty of Geodesy, University of Zagreb,
Kaciceva 26, HR-10000 Zagreb, Croatia

(2) Astronomical Observatory, Opaticka 22, HR-10000 Zagreb, Croatia

(3) Kiepenheuer-Institut fuer Sonnenphysik, Schoeneckstr. 6.,
D-79104 Freiburg, Germany

(4) Observatoire Royal de Belgique, Departement de Physique Solaire,
Avenue Circulaire 3, B-1180 Bruxelles, Belgique

Full-disc solar images in the extreme ultraviolet part of the spectrum from the SOHO spacecraft (EIT) will be used to identify various coronal structures appropriate for the solar rotation determination (e.g. bright points and coronal holes). From the time differences in tracer positions (more than 1 image per day) solar rotation velocities will be measured, primarily by well-defined tracers, such as coronal bright points, whose large number and broad coverage of latitudes may provide an unique opportunity for a solar rotation analysis. The method to determine simultaneously the true solar synodic rotation velocity and the height of tracers (Rosa et al., 1998, Solar Phys. 179, 237) will be applied. One of the final goals of this study is to cover many years of observations and to investigate possible cycle-related changes of the solar rotation velocity.

inside_collab

F. Clette

consortium

no

topic

Rotation

topic

title

An analysis of the solar rotation velocity by tracing coronal features

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