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On the determination of heliographic positions and rotation velocities of sunspots

I. Comparison of results from different observatories and different observing procedures

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Abstract

Heliographic coordinates of several small but stable sunspots, which were determined at five different observatories in 1979, are compared. Some systematic differences within these results are found, which suggest a more detailed analysis of the data accumulation procedures and the physical interpretation. The same holds for the rotation velocities derived from the position data.

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Authors and Affiliations

  1. Kiepenheuer-Institut für Sonnenphysik, Schöneckstr. 6, D-7800, Freiburg, Germany

    Hubertus Wöhl

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  1. Hubertus Wöhl
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Mitteilungen aus dem Kiepenheuer-Institut Nr. 230.

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Wöhl, H. On the determination of heliographic positions and rotation velocities of sunspots. Sol Phys 88, 65–70 (1983). https://doi.org/10.1007/BF00196177

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  • DOI: https://doi.org/10.1007/BF00196177

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