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Wolf number

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better equipment, after taking over from Wolf. This scaling has been dropped from the revised series, making modern counts closer to their raw values. Also, counts were reduced slightly after 1947 to compensate for bias introduced by a new counting method adopted that year, in which sunspots are weighted according to their size.
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Since 1 July 2015 a revised and updated international sunspot number series has been made available. The biggest difference is an overall increase by a factor of 1.6 to the entire series. Traditionally, a scaling of 0.6 was applied to all sunspot counts after 1893, to compensate for Alfred Wolfer's
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The accuracy of the compilation of the group sunspot number series has been questioned, motivating the development of several alternative series suggesting different behavior of sunspot group activity before the 20th century. However, indirect indices of solar activity favor the group sunspot number
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The observatory factor compensates for the differing number of recorded individual sunspots and sunspot groups by different observers. These differences in recorded values occur due to differences in instrumentation, local seeing, personal experience, and other factors between observers. Since Wolf
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in 1843, thus sometimes it is also referred to as the Schwabe cycle. The periodicity is not constant but varies roughly in the range 9.5 to 11 years. The international sunspot number series extends back to 1700 with annual values while daily values exist only since 1818.
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A different index of sunspot activity was introduced in 1998 in the form of the number of groups apparent on the solar disc. With this index it was made possible to include sunspot data acquired since 1609, being the date of the invention of the telescope.
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Astronomers have been observing the Sun recording information about sunspots since the advent of the telescope in 1609. However, the idea of compiling the information about the sunspot number from various observers originates in
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To calculate the 13-month smoothed monthly mean sunspot number, which is commonly used to calculate the minima and maxima of solar cycles, a tapered-boxcar smoothing function is used. For a given month
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The international sunspot number series is still being produced today at the observatory of Brussels. The international number series shows an approximate periodicity of 11 years, the
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Clette, Frédéric; Svalgaard, Leif; Vaquero, José M.; Cliver, Edward W. (December 2014). "Revisiting the Sunspot Number: A 400-Year Perspective on the Solar Cycle".
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Chatzistergos, T.; et al. (2017). "New reconstruction of the sunspot group numbers since 1739 using direct calibration and "backbone" methods".
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Clette, Frédéric; Berghmans, David; Vanlommel, Petra; Van der Linden, Ronald A.M.; Koeckelenbergh, André; Wauters, Laurence (January 2007).
914:"Centennial variations in sunspot number, open solar flux, and streamer belt width: 1. Correction of the sunspot number record since 1874" 1457: 1751: 1437: 116:. The produced series initially had his name, but now it is more commonly referred to as the international sunspot number series. 744: 1907: 1172: 1912: 1009:
Usoskin; et al. (2016). "A new calibrated sunspot group series since 1749: statistics of active day fractions".
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Wu, C.-J.; et al. (2018). "Solar total and spectral irradiance reconstruction over the last 9000 years".
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and groups of sunspots present on the surface of the Sun. Historically, it was only possible to detect
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Hoyt, D.; Schatten, K. H. (1998). "Group Sunspot Numbers: A New Solar Activity Reconstruction".
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Svalgaard, Schatten (2016). "Reconstruction of the sunspot group number: the backbone method".
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was the primary observer for the relative sunspot number, his observatory factor was 1.
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function on the data gives an average maximum at 10.4883 years/cycle.
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Solar Influences Data Analysis Center (SIDC) for the Sunspot Index
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Usoskin, I. (2017). "A history of solar activity over millennia".
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is a factor that varies with observer and is referred to as the
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(2009). 1406:NASA Solar Physics Sunspot Cycle page 1396:The Exploratorium's Guide to Sunspots 1060: 1058: 7: 255:is the number of sunspot groups, and 1171:Asvestari, E.; et al. (2017). 319:, with a monthly sunspot number of 1212:: CS1 maint: unflagged free DOI ( 647:series by Chatzistergos T. et al. 233:is the number of individual spots, 14: 1926: 1925: 688:The Sun Recorded Through History 23: 1286:Living Reviews in Solar Physics 1120:Living Reviews in Solar Physics 1410:Table of Sunspot Numbers (txt) 912:Lockwood; et al. (2014). 598:is the monthly sunspot number 541: 396: 283:personal reduction coefficient 194: 179: 160:is computed using the formula 1: 1908:List of heliophysics missions 1913:Category:Missions to the Sun 745:Royal Observatory of Belgium 346:, the smoothed monthly mean 140:The relative sunspot number 1259:10.1051/0004-6361/201832956 1097:10.1051/0004-6361/201630045 921:J. Geophys. Res. Space Phys 123:, which was first found by 34:may have misleading content 16:Measure of sunspot activity 1973: 847:Advances in Space Research 200:{\displaystyle R=k(10g+s)} 1921: 1889:G-type main-sequence star 1453: 1150:10.1007/s41116-017-0006-9 1041:10.1007/s11207-015-0838-1 988:10.1007/s11207-015-0815-8 867:10.1016/j.asr.2006.12.045 820:10.1007/s11214-014-0074-2 697:10.1007/978-0-387-92790-9 1752:In mythology and culture 1282:"Solar cycle prediction" 1371:10.1023/A:1005007527816 1251:2018A&A...620A.120W 1089:2017A&A...602A..69C 618:months away from month 591:{\displaystyle R_{m+n}} 73:relative sunspot number 63:Wolf number since 1750. 1619:Supra-arcade downflows 1412:by month since 1749 CE 632: 612: 592: 556: 367: 340: 313: 271: 249: 227: 201: 154: 64: 1599:Coronal mass ejection 1280:Petrovay, K. (2019). 790:Space Science Reviews 691:. Springer New York. 666:Joy's law (astronomy) 633: 613: 593: 557: 368: 366:{\displaystyle R_{s}} 341: 339:{\displaystyle R_{m}} 314: 294:Smoothed monthly mean 272: 250: 228: 202: 155: 91:. Since 2006, NASA's 62: 1863:Standard solar model 1833:Solar radio emission 1651:List of solar cycles 1317:10.12942/lrsp-2010-6 1200:10.1093/mnras/stx190 942:10.1002/2014JA019970 747:, 'year(s)-of-data'. 622: 602: 569: 380: 373:can be expressed as 350: 323: 303: 261: 239: 217: 167: 144: 1683:Magnetic switchback 1363:1998SoPh..179..189H 1308:2020LRSP...17....2P 1192:2017MNRAS.467.1608A 1142:2017LRSP...14....3U 1033:2016SoPh..291.2685U 1017:(9–10): 2685–2708. 980:2016SoPh..291.2653S 933:2014JGRA..119.5172L 859:2007AdSpR..40..919C 812:2014SSRv..186...35C 721:"The Sun - History" 71:(also known as the 40:clarify the content 1873:Sunlight radiation 1468:Internal structure 642:Alternative series 628: 608: 588: 552: 363: 336: 309: 279:observatory factor 267: 245: 223: 197: 150: 65: 1952:Stellar phenomena 1939: 1938: 1903:Solar observatory 1818:Solar observation 1716:Termination shock 1632: 1631: 1584:Transition region 1229:Astron. Astrophys 1067:Astron. Astrophys 706:978-0-387-92790-9 631:{\displaystyle m} 611:{\displaystyle n} 312:{\displaystyle m} 270:{\displaystyle k} 248:{\displaystyle g} 226:{\displaystyle s} 153:{\displaystyle R} 57: 56: 1964: 1929: 1928: 1518:Supergranulation 1506: 1440: 1433: 1426: 1417: 1383: 1382: 1346: 1340: 1339: 1329: 1319: 1301: 1277: 1271: 1270: 1244: 1224: 1218: 1217: 1211: 1203: 1186:(2): 1608–1613. 1177: 1168: 1162: 1161: 1135: 1115: 1109: 1108: 1082: 1062: 1053: 1052: 1026: 1006: 1000: 999: 973: 953: 947: 946: 944: 927:(7): 5172–5182. 918: 909: 903: 902: 900: 898: 884: 878: 877: 875: 873: 838: 832: 831: 805: 785: 776: 771: 765: 756:Using data from 754: 748: 738: 732: 731: 729: 728: 717: 711: 710: 682: 637: 635: 634: 629: 617: 615: 614: 609: 597: 595: 594: 589: 587: 586: 561: 559: 558: 553: 548: 540: 539: 518: 517: 493: 492: 474: 473: 461: 460: 436: 435: 417: 416: 392: 391: 372: 370: 369: 364: 362: 361: 345: 343: 342: 337: 335: 334: 318: 316: 315: 310: 276: 274: 273: 268: 254: 252: 251: 246: 232: 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Index

clarify the content

sunspots
sunspots
helioseismology
STEREO
Rudolf Wolf
Zürich
Switzerland
solar cycle
Heinrich Schwabe
Solar cycle
Joy's law (astronomy)
The Sun Recorded Through History
doi
10.1007/978-0-387-92790-9
ISBN
978-0-387-92790-9
"The Sun - History"
SIDC
Royal Observatory of Belgium
SIDC
FFT
Switching to the new Sunspot Number (1 July 2015)


arXiv
1407.3231
Bibcode
2014SSRv..186...35C

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