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Accuracy Analysis for Digitized Sunspot Hand-drawing Records of Purple Mountain Observatory
Li Ranyang; Zhou Tuanhui; Ji Kaifan
2016
Source PublicationActa Astronomica Sinica
Volume57Issue:3Pages:292-301
AbstractSunspot is the most significant feature in solar disk, and the earliest record of the solar activities. It has been systematically observed for about 400 years after the invention of telescopes. The long-term evolution of solar activities, especially the 11 year solar cycle, has been obtained based on these data to a great extent. In recent years, the historical hand-drawing records of sunspot are processed digitally for permanent preserving and computer processing. The hand-drawing records of sunspot will be eventually replaced by the CCD image in the future, therefore it is necessary to evaluate the accuracy of hand-drawing records by comparing them with the CCD image. In this study, 189 digital hand-drawing records of sunspot observed by Purple Mountain Observatory in 2011 are analyzed. The results include: (1) the scanner scale difference between horizontal and vertical directions is 0.2%; (2) the ring of the Sun on the recording paper is not a perfect circle, and the diameter in the east-west direction is 1% shorter than that in the north-south direction; (3) the orientation error of the record paper can reach up to 0.5 degree in scanning. After comparing the sunspot position of hand-drawing records with the simultaneous SDO/HMI (Solar Dynamics Observatory/ Helioseismic and Magnetic Imager) images of continuous spectrum by overlapping method, we find that the accuracy of sunspot position in hand-drawing record is about 7 arcsec. There are roughly 3% of the hand-drawing sunspots whose corresponding sunspots in SDO/HMI images can not be found.
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16877
Collection太阳高能及相关物理过程研究团组
Recommended Citation
GB/T 7714
Li Ranyang,Zhou Tuanhui,Ji Kaifan. Accuracy Analysis for Digitized Sunspot Hand-drawing Records of Purple Mountain Observatory[J]. Acta Astronomica Sinica,2016,57(3):292-301.
APA Li Ranyang,Zhou Tuanhui,&Ji Kaifan.(2016).Accuracy Analysis for Digitized Sunspot Hand-drawing Records of Purple Mountain Observatory.Acta Astronomica Sinica,57(3),292-301.
MLA Li Ranyang,et al."Accuracy Analysis for Digitized Sunspot Hand-drawing Records of Purple Mountain Observatory".Acta Astronomica Sinica 57.3(2016):292-301.
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