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D. Roša

Publications and source records attributed to D. Roša.

2 recordsLinked to original sources
arXiv2022

Determination of the Solar Rotation Elements and Period from Ruđer Bošković's Sunspot Observations in 1777

This paper focuses on the observations of sunspots made by Ruđer Bošković in 1777. We derived the expressions needed to calculate the elements of the Sun's rotation and period from observations. We used modern ephemeris data in the processing of the observation results. Obtained results are very similar to Bošković's original calculations. In addition to historical significance, they also provide scientifically valuable data on the Sun's differential rotation, which plays a significant role in generating and maintaining solar magnetic activity.

astro-ph.SR↗
arXiv2013

Validity of the relations between the synodic and sidereal rotation velocities of the Sun

Existing methods for conversion between synodic and sidereal rotation velocities of the Sun are tested for validity using state of the art ephemeris data. It is found that some of them are in good agreement with ephemeris calculations, while the other ones show a discrepancy of almost 0.01 deg per day. The discrepancy is attributed to a missing factor and a new corrected relation is given.

astro-ph.SR↗