7世纪初至887年《日本历代志》中的极光候选者和太阳黑子记录
Records of Auroral Candidates and Sunspots in Rikkokushi, Chronicles of Ancient Japan from Early 7th Century to 887
摘要：
本文介绍了《日本正史·立国志》中从7世纪初到887年对太阳黑子和极光候选者的调查结果，以回顾太阳和极光活动。我们在Rikkokushi总共发现了一个太阳黑子记录和13个极光候选者。然后，我们检查记录的太阳黑子和极光候选人，比较极光候选人与月相估计的可靠性的极光候选人，并比较记录的太阳黑子和极光候选人与当代总太阳辐照度重建放射性同位素数据。我们还确定了观测地点的位置，以审查可能的极光椭圆向赤道扩展。这些讨论表明，从7世纪末到9世纪初的极光候选人的主要差距，其中包括最低数量的候选人重建的放射性同位素数据，类似的趋势，在当代中国的太阳黑子记录的分布，和一个相对较高的磁纬度与更高的潜力，观测极光比现在更频繁。
英文摘要：
In this article, we present the results of the surveys on sunspots and auroral candidates in Rikkokushi, Japanese Official Histories from the early 7th century to 887 to review the solar and auroral activities. In total, we found one sunspot record and 13 auroral candidates in Rikkokushi. We then examine the records of the sunspots and auroral candidates, compare the auroral candidates with the lunar phase to estimate the reliability of the auroral candidates, and compare the records of the sunspots and auroral candidates with the contemporary total solar irradiance reconstructed from radioisotope data. We also identify the locations of the observational sites to review possible equatorward expansion of auroral oval. These discussions suggest a major gap of auroral candidates from the late 7th to early 9th century, which includes the minimum number of candidates reconstructed from the radioisotope data, a similar tendency as the distributions of sunspot records in contemporary China, and a relatively high magnetic latitude with a higher potential for observing aurorae more frequently than at present.
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