Sunspot Positions and Areas from Observations by Thomas Harriot

Результат исследований: Научные публикации в периодических изданияхстатьярецензирование

6 Цитирования (Scopus)

Аннотация

The reconstruction of sunspot parameters in the early era of telescopic observa- tions extends our knowledge on visual sunspot activity up to 400 years into the past. 200 digital solar images from 18 December 1610 to 28 January 1613 by the English astronomer Thomas Harriot were analyzed to yield sunspot counts, areas and positions. Harriot gen- erally observed in the early morning when the Sun was near the horizon, and he specified the local time of observation, date, place, number of spots, zenith and ecliptic lines, and other information. We assigned 753 sunspots into 293 groups and defined their areas. We developed two approaches to reconstructing the heliographic coordinates of the sunspots. Method I makes use of the time of observation noted by Harriot, and Method II minimizes the day-to-day variability of sunspot latitudes independently of Harriot’s notes. The results of the two methods are discussed.
Язык оригиналаанглийский
Номер статьи39
Число страниц11
ЖурналSolar Physics
Том295
Номер выпуска3
DOI
СостояниеОпубликовано - 1 мар 2020

Предметные области Scopus

  • Астрономия и астрофизика
  • Космические науки и планетоведение

Ключевые слова

  • Sunspots · Solar cycle · Observations

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