Abstract
The dependence 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 photospheric level projected on the solar disc. The centre-to-limb variation of this error can be used to determine simultaneously the height of the object and the true synodic rotation 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 heliographic 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.
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Roša, D., Vršnak, B., Božić, H. et al. A Method to Determine the Solar Synodic Rotation Rate and the Height of Tracers. Solar Physics 179, 237–252 (1998). https://doi.org/10.1023/A:1005035213782
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DOI: https://doi.org/10.1023/A:1005035213782