Solar diameter variations in 2001/2002

Details Solar diameter variations in 2001/2002 Solar diameter variations in 2001/2002

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23...50b&link_type=abstract

Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 50-50

Astronomy and Astrophysics

Astronomy

Scientific paper

Results are presented for the astrometric observations of the variation of the solar diameter, relative to the 2001 and 2002 campaigns made at Observatório Nacional (F = -22° 53 42). They give continuity to the series pursued as from 1997, with the solar astrolabe equipped with a variable zenith distance front prism. The series covers the activity cycle 23, for which the presented results follow the beginning of its fall. The observational strategy has been kept of obtaining a detailed coverage of heliolatitudes and a wide span of zenith distances. In so, 4878 independent measurements are here considered, evenly divided on time, and about the meridian transit. Upon the raw results are applied observational corrections (depending on the temperature, the temperature gradient, the Fried's parameter, and on the standard deviation of the adjusted limb) and instrumental corrections (for instability of the front prism and for leveling). All corrections were independently calculated by year and by the part of the day of the observing session. Alike values are obtained. The corrections are also alike to those derived from the earlier years of the series. The combined amplitude does not reach 50mas. The observed variations of the solar semidiameter tend to follow the sunspots count for the period. There is a sharp fall on the earliest of 2001 followed by a noisy increase, while it diminishes since the beginning of 2002. The mean value for the observed solar semidiameter in the period is 959".199 +/- 0".007, to a standard deviation of 0".553.

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