Naslov
A method to determine the solar synodic rotation rate and the height of tracers

Autori
Roša, Dragan ; Vršnak, Bojan ; Božić, Hrvoje ; Brajša, Roman ; Ruždjak, Vladimir ; Schroll, Alfred ; Woehl, Hubertus

Izvornik
Solar Physics (0038-0938) 179 (1998), 2; 237-252

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Sažetak
The dependance of the measured apparent synodic solar rotation rate on the height of the chosen tracer is studied. A significant error occurs if the rotation rate is determined by tracing the apparent position of an object above the photosperic level projected on the solar disc. The center-to-limb variation of this error can be used to determine simultaneously the height of the object and the true synodic rotatition rate. The apparent (projected) heliographic coordinates are presented as a function of the height of the traced object and the coordinates of its 'footpoint'. The relations obtained provide an explicit expression for the apparent rotation rate as a function of the observed heligraphic coordinates of the tracer, enabling an analytic least-squares fit expression to determine simultaneously the real synodic rotation rate and the height of the tracer.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA