Sunspot Positions and Areas from Observations by Thomas Harriot

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Sunspot Positions and Areas from Observations by Thomas Harriot. / Vokhmyanin, Mikhail ; Arlt, Rainer; Zolotova, Nadezhda .

In: Solar Physics, Vol. 295, No. 3, 39, 01.03.2020.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{d4eb54e4bc3644e2a6659c71b77d6075,

title = "Sunspot Positions and Areas from Observations by Thomas Harriot",

abstract = "The reconstruction of sunspot parameters in the early era of telescopic observations 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 generally 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{\textquoteright}s notes. The results of the two methods are discussed.",

keywords = "Sunspots · Solar cycle · Observations, sunspots, Solar cycle, observations, Observations, Sunspots",

author = "Mikhail Vokhmyanin and Rainer Arlt and Nadezhda Zolotova",

note = "Vokhmyanin, M., Arlt, R. & Zolotova, N. Sunspot Positions and Areas from Observations by Thomas Harriot. Sol Phys 295, 39 (2020). https://doi.org/10.1007/s11207-020-01604-4",

year = "2020",

month = mar,

day = "1",

doi = "10.1007/s11207-020-01604-4",

language = "English",

volume = "295",

journal = "Solar Physics",

issn = "0038-0938",

publisher = "Springer Nature",

number = "3",

}

RIS

TY - JOUR

T1 - Sunspot Positions and Areas from Observations by Thomas Harriot

AU - Vokhmyanin, Mikhail

AU - Arlt, Rainer

AU - Zolotova, Nadezhda

N1 - Vokhmyanin, M., Arlt, R. & Zolotova, N. Sunspot Positions and Areas from Observations by Thomas Harriot. Sol Phys 295, 39 (2020). https://doi.org/10.1007/s11207-020-01604-4

PY - 2020/3/1

Y1 - 2020/3/1

N2 - The reconstruction of sunspot parameters in the early era of telescopic observations 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 generally 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.

AB - The reconstruction of sunspot parameters in the early era of telescopic observations 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 generally 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.

KW - Sunspots · Solar cycle · Observations

KW - sunspots

KW - Solar cycle

KW - observations

KW - Observations

KW - Sunspots

UR - http://www.scopus.com/inward/record.url?scp=85081602311&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/fe995d9c-cbbd-3058-90c5-658e4685c4d5/

U2 - 10.1007/s11207-020-01604-4

DO - 10.1007/s11207-020-01604-4

M3 - Article

VL - 295

JO - Solar Physics

JF - Solar Physics

SN - 0038-0938

IS - 3

M1 - 39

ER -

ID: 52742338