Works matching Sunspots

Results: 4065

Total sunspot number calculation based on flare production potential of sunspot groups: reconstruction of SSN and its relation to some geomagnetic indices.

Published in:

Turkish Journal of Physics, 2019, v. 43, n. 2, p. 187, doi. 10.3906/fiz-1811-7

By:

KARSLIOĞLU, Ahmet Burak;
DÖNMEZ, Burçin;
KILÇIK, Ali

Publication type:

Article

EXPLORE THE RELATIONSHIP BETWEEN SUNSPOT AREA AND SUNSPOT NUMBER WITH A NEW METHOD.

Published in:

Acta Geodynamica et Geomaterialia, 2024, v. 21, n. 1, p. 27, doi. 10.13168/AGG.2024.0003

By:

Juan ZHAO

Publication type:

Article

Sunspot extraction and hemispheric statistics of YNAO sunspot drawings using deep learning.

Published in:

Astrophysics & Space Science, 2023, v. 368, n. 1, p. 1, doi. 10.1007/s10509-022-04155-1

By:

Yang, Zhaoshuai;
Yang, Yunfei;
Feng, Song;
Liang, Bo;
Dai, Wei;
Xiong, Jianping

Publication type:

Article

A formula for the start of a new sunspot cycle: Relating the adjusted 10.7 cm solar flux to the start of a new sunspot cycle.

Published in:

Astrophysics & Space Science, 2020, v. 365, n. 7, p. N.PAG, doi. 10.1007/s10509-020-03800-x

By:

Geryl, P. P. A.;
Alvestad, Jan

Publication type:

Article

Synchronization of Sunspot Numbers and Sunspot Areas.

Published in:

Solar Physics, 2009, v. 255, n. 2, p. 289, doi. 10.1007/s11207-009-9328-7

By:

Li, K.;
Gao, P.;
Zhan, L.

Publication type:

Article

Group Sunspot Numbers: A New Reconstruction of Sunspot Activity Variations from Historical Sunspot Records Using Algorithms from Machine Learning.

Published in:

Solar Physics, 2022, v. 297, n. 1, p. 1, doi. 10.1007/s11207-021-01926-x

By:

Velasco Herrera, Víctor Manuel;
Soon, Willie;
Hoyt, Douglas V.;
Muraközy, Judit

Publication type:

Article

Sunspot Count Periodicities in Different Zurich Sunspot Group Classes Since 1986.

Published in:

Solar Physics, 2014, v. 289, n. 11, p. 4365, doi. 10.1007/s11207-014-0580-0

By:

Kilcik, A.;
Ozguc, A.;
Yurchyshyn, V.;
Rozelot, J.

Publication type:

Article

Relation between Coronal Mass Ejections and Sunspot Number during Solar Cycle 24.

Published in:

Iraqi Journal of Science, 2019, v. 60, n. 8, p. 1860, doi. 10.24996/ijs.2019.60.8.23

By:

Hussein, Zeinab F.

Publication type:

Article

Bayesian Knowledge Infusion for Studying Historical Sunspot Numbers.

Published in:

Universe (2218-1997), 2024, v. 10, n. 9, p. 370, doi. 10.3390/universe10090370

By:

Jiang, Wenxin;
Ji, Haisheng

Publication type:

Article

Lifetime of Long-Lived Sunspot Groups.

Published in:

Universe (2218-1997), 2024, v. 10, n. 8, p. 318, doi. 10.3390/universe10080318

By:

Muraközy, Judit

Publication type:

Article

Possible variations in sunspot groups before flaring activity during solar cycles 23 and 24.

Published in:

Turkish Journal of Physics, 2017, v. 41, n. 4, p. 351, doi. 10.3906/fiz-1704-4

By:

KILÇIK, Ali;
ŞAHİN, Seray

Publication type:

Article

Influence of the Change in the Relative Number of Pores in Activity Cycles on the Reconstruction of the Sunspot Index.

Published in:

Astronomy Reports, 2022, v. 66, n. 2, p. 165, doi. 10.1134/S1063772922030052

By:

Tlatova, K. A.;
Vasil'eva, V. V.;
Berezin, I. A.;
Illarionov, E. A.;
Tlatov, A. G.

Publication type:

Article

The Possibility of Observing Several Hydrogen Radio Lines in Solar Activity Features over Sunspots.

Published in:

Astronomy Reports, 2021, v. 65, n. 8, p. 705, doi. 10.1134/S1063772921080047

By:

Dravskikh, A. F.;
Dravskikh, Yu. A.

Publication type:

Article

Long-term variations in sunspot magnetic field-area relation.

Published in:

Astronomische Nachrichten, 2017, v. 338, n. 1, p. 26, doi. 10.1002/asna.201613035

By:

Nagovitsyn, Y. A.;
Pevtsov, A. A.;
Osipova, A. A.

Publication type:

Article

Sunspot drawings at Kodaikanal Observatory: a representative results on hemispheric sunspot numbers and area measurements.

Published in:

Astrophysics & Space Science, 2020, v. 365, n. 1, p. 1, doi. 10.1007/s10509-020-3725-7

By:

Ravindra, B.;
Pichamani, Kumaravel;
Selvendran, R.;
Samuel, Joyce;
Kumar, Praveen;
Jassoria, Nancy;
Navneeth, R. S.

Publication type:

Article

A semi-automated method to reveal the evolution of each sunspot group in a solar cycle.

Published in:

Astrophysics & Space Science, 2018, v. 363, n. 12, p. 1, doi. 10.1007/s10509-018-3485-9

By:

Çakmak, H.

Publication type:

Article

The Relationships of Sunspot Magnetic Field Strength with Sunspot Area, Umbral Area and Penumbra-Umbra Radius Ratio.

Published in:

Astrophysics & Space Science, 2006, v. 306, n. 1/2, p. 23, doi. 10.1007/s10509-006-9217-6

By:

Jin, C.;
Qu, Z.;
Xu, C.;
Zhang, X.;
Sun, M.

Publication type:

Article

The Rotation Rate of the Active Longitude and Sunspot Groups on It and Other Characteristics of Sunspot Groups at the End of the Descending Branch of Solar Cycle 24.

Published in:

Geomagnetism & Aeronomy, 2023, v. 63, n. 8, p. 1210, doi. 10.1134/S001679322308011X

By:

Kostyuchenko, I. G.;
Vernova, E. S.

Publication type:

Article

Three-minute oscillations in sunspots: Seismology of sunspot atmospheres.

Published in:

Astronomy Letters, 2007, v. 33, n. 9, p. 622, doi. 10.1134/S106377370709006X

By:

Zhugzhda, Yu. D.

Publication type:

Article

Development of a Code to Analyze the Solar White-Light Images from the Kodaikanal Observatory: Detection of Sunspots, Computation of Heliographic Coordinates and Area.

Published in:

Journal of Astrophysics & Astronomy, 2016, v. 37, n. 1, p. 1, doi. 10.1007/s12036-016-9370-4

By:

Pucha, Ragadeepika;
Hiremath, K.;
Gurumath, Shashanka

Publication type:

Article

The Rotating Sunspot in AR 10930.

Published in:

Solar Physics, 2009, v. 258, n. 2, p. 203, doi. 10.1007/s11207-009-9425-7

By:

Soonyoung Min;
Jongchul Chae

Publication type:

Article

Time Series Modeling of Sunspot Numbers Using Long-Range Cyclical Dependence.

Published in:

Solar Physics, 2009, v. 257, n. 2, p. 371, doi. 10.1007/s11207-009-9390-1

By:

Gil-Alana, Luis A.

Publication type:

Article

The Long-term Behavior of the North – South Asymmetry of Sunspot Activity.

Published in:

Solar Physics, 2009, v. 254, n. 1, p. 145, doi. 10.1007/s11207-008-9284-7

By:

Li, K. J.;
Gao, P. X.;
Zhan, L. S.

Publication type:

Article

Time – Distance Modelling in a Simulated Sunspot Atmosphere.

Published in:

Solar Physics, 2008, v. 251, n. 1/2, p. 309, doi. 10.1007/s11207-008-9190-z

By:

Moradi, H.;
Cally, P.

Publication type:

Article

Study of sunspots and sunspot.

Published in:

Current Science (00113891), 2010, v. 98, n. 11, p. 1496

By:

Pandey, S. K.;
Shrivastava, Rahul;
Borkar, L. K.;
Tripathi, A. K.;
Tripathi, Aka;
Dubey, S. C.

Publication type:

Article

Revisiting the Sunspot Number.

Published in:

Space Science Reviews, 2014, v. 186, n. 1-4, p. 35, doi. 10.1007/s11214-014-0074-2

By:

Clette, Frédéric;
Svalgaard, Leif;
Vaquero, José;
Cliver, Edward

Publication type:

Article

DER AUSBRUCH DES VULKANS TAMBORA 1815 UND DIE DOKUMENTATION VON SONNENFLECKEN AM STIFT ADMONT IM RAHMEN ZEITGENÖSSISCHER METEOROLOGISCHER BEOBACHTUNGEN.

Published in:

Mitteilungen der Österreichischen Geographischen Gesellschaft, 2021, v. 163, p. 61, doi. 10.1553/moegg163s61

By:

Kellerer-Pirklbauer, Andreas;
Eulenstein, Julia

Publication type:

Article

Long-Lived Sunspots in Historical Records: A Case Study Analysis from 1660 to 1676.

Published in:

Solar Physics, 2025, v. 300, n. 2, p. 1, doi. 10.1007/s11207-025-02432-0

By:

Zolotova, Nadezhda;
Vokhmyanin, Mikhail

Publication type:

Article

Evaluation of Sunspot Areas Derived by Automated Sunspot-Detection Methods.

Published in:

Solar Physics, 2024, v. 299, n. 11, p. 1, doi. 10.1007/s11207-024-02402-y

By:

Hanaoka, Yoichiro

Publication type:

Article

Rudolf Wolf to Alfred Wolfer: The Transfer of the Reference Observer in the International Sunspot Number Series (1876–1893).

Published in:

Solar Physics, 2024, v. 299, n. 4, p. 1, doi. 10.1007/s11207-024-02261-7

By:

Bhattacharya, S.;
Lefèvre, L.;
Chatzistergos, T.;
Hayakawa, H.;
Jansen, M.

Publication type:

Article

Two Populations of Sunspot Groups and Their Meridional Motions.

Published in:

Solar Physics, 2023, v. 298, n. 9, p. 1, doi. 10.1007/s11207-023-02204-8

By:

Nagovitsyn, Yury;
Pevtsov, Alexei;
Osipova, Aleksandra

Publication type:

Article

Temporal and Latitudinal Variation in Penumbra-Umbra Ratios of the Sunspots: Analyses of RGO, Kodaikanal and Debrecen Databases.

Published in:

Solar Physics, 2023, v. 298, n. 5, p. 1, doi. 10.1007/s11207-023-02161-2

By:

Takalo, Jouni

Publication type:

Article

Hemispheric Sunspot Numbers from the Astronomical Observatory of the University of Valencia (1940 – 1956).

Published in:

Solar Physics, 2023, v. 298, n. 4, p. 1, doi. 10.1007/s11207-023-02143-4

By:

Carrasco, V. M. S.;
Aparicio, A. J. P.;
Gallego, M. C.;
Vaquero, J. M.

Publication type:

Article

Clarifying Physical Properties of Magnetic Fields in Sunspots.

Published in:

Solar Physics, 2022, v. 297, n. 10, p. 1, doi. 10.1007/s11207-022-02066-6

By:

Obridko, V. N.;
Katsova, M. M.;
Sokoloff, D. D.;
Shelting, B. D.;
Livshits, I. M.

Publication type:

Article

Correlations of Sunspot Physical Characteristics during Solar Cycle 23.

Published in:

Solar Physics, 2020, v. 295, n. 9, p. N.PAG, doi. 10.1007/s11207-020-01691-3

By:

Valio, Adriana;
Spagiari, Eduardo;
Marengoni, Mauricio;
Selhorst, Caius L.

Publication type:

Article

Comparative Study of a Sunspot at Two Different Instances of Time.

Published in:

Solar Physics, 2020, v. 295, n. 4, p. 1, doi. 10.1007/s11207-020-01627-x

By:

Hamedivafa, Hashem

Publication type:

Article

Comparison of Latitude Distribution and Evolution of Even and Odd Sunspot Cycles.

Published in:

Solar Physics, 2020, v. 295, n. 3, p. 1, doi. 10.1007/s11207-020-01615-1

By:

Takalo, Jouni

Publication type:

Article

Do Records of Sunspot Sightings Provide Reliable Indicators of Solar Maxima for 1613 – 1918?

Published in:

Solar Physics, 2019, v. 294, n. 10, p. N.PAG, doi. 10.1007/s11207-019-1528-1

By:

Wang, Hongrui;
Li, Huiduan

Publication type:

Article

A Transit of Venus Possibly Misinterpreted as an Unaided-Eye Sunspot Observation in China on 9 December 1874.

Published in:

Solar Physics, 2019, v. 294, n. 9, p. N.PAG, doi. 10.1007/s11207-019-1504-9

By:

Hayakawa, Hisashi;
Sôma, Mitsuru;
Tanikawa, Kiyotaka;
Willis, David M.;
Wild, Matthew N.;
Macdonald, Lee T.;
Imada, Shinsuke;
Hattori, Kentaro;
Richard Stephenson, F.

Publication type:

Article

Study of Sunspot Penumbra to Umbra Area Ratio Using Kodaikanal White-light Digitised Data.

Published in:

Solar Physics, 2019, v. 294, n. 6, p. N.PAG, doi. 10.1007/s11207-019-1462-2

By:

Jha, Bibhuti Kumar;
Mandal, Sudip;
Banerjee, Dipankar

Publication type:

Article

Chinese Sunspot Drawings and Their Digitization – (I) Parameter Archives.

Published in:

Solar Physics, 2019, v. 294, n. 6, p. N.PAG, doi. 10.1007/s11207-019-1456-0

By:

Lin, G. H.;
Wang, X. F.;
Liu, S.;
Yang, X.;
Zhu, G. F.;
Deng, Y. Y.;
Ji, H. S.;
Zhou, T. H.;
Sun, L. N.;
Feng, Y. L.;
Liu, Z. Z.;
Tao, J. P.;
Ben, M. X.;
Lin, J.;
Ding, M. D.;
Li, Z.;
Zheng, S.;
Zeng, S. G.;
He, H. L.;
Zeng, X. Y.

Publication type:

Article

A Sunspot Catalog for the Period 1952 - 1986 from Observations Made at the Madrid Astronomical Observatory.

Published in:

Solar Physics, 2018, v. 293, n. 12, p. 1, doi. 10.1007/s11207-018-1387-1

By:

Aparicio, A. J. P.;
Lefèvre, L.;
Gallego, M. C.;
Vaquero, J. M.;
Clette, F.;
Bravo-Paredes, N.;
Galaviz, P.;
Bautista, M. L.

Publication type:

Article

Sunspot Positions and Areas from Observations by Pierre Gassendi.

Published in:

Solar Physics, 2018, v. 293, n. 11, p. 1, doi. 10.1007/s11207-018-1372-8

By:

Vokhmyanin, Mikhail;
Zolotova, Nadezhda

Publication type:

Article

A Curious History of Sunspot Penumbrae: An Update.

Published in:

Solar Physics, 2018, v. 293, n. 7, p. 1, doi. 10.1007/s11207-018-1328-z

By:

Carrasco, V. M. S.;
Vaquero, J. M.;
Trigo, R. M.;
Gallego, M. C.

Publication type:

Article

Tests of Sunspot Number Sequences: 3. Effects of Regression Procedures on the Calibration of Historic Sunspot Data.

Published in:

Solar Physics, 2016, v. 291, n. 9/10, p. 2829, doi. 10.1007/s11207-015-0829-2

By:

Lockwood, M.;
Owens, M.;
Barnard, L.;
Usoskin, I.

Publication type:

Article

The Discontinuity Circa 1885 in the Group Sunspot Number.

Published in:

Solar Physics, 2016, v. 291, n. 9/10, p. 2763, doi. 10.1007/s11207-015-0841-6

By:

Cliver, E.;
Ling, A.

Publication type:

Article

Re-examination of the Daily Number of Sunspot Groups for the Royal Observatory, Greenwich (1874 - 1885).

Published in:

Solar Physics, 2016, v. 291, n. 9/10, p. 2519, doi. 10.1007/s11207-016-0856-7

By:

Willis, D.;
Wild, M.;
Warburton, J.

Publication type:

Article

70 Years of Sunspot Observations at the Kanzelhöhe Observatory: Systematic Study of Parameters Affecting the Derivation of the Relative Sunspot Number.

Published in:

Solar Physics, 2016, v. 291, n. 9/10, p. 3103, doi. 10.1007/s11207-016-0857-6

By:

Pötzi, Werner;
Veronig, Astrid;
Temmer, Manuela;
Baumgartner, Dietmar;
Freislich, Heinrich;
Strutzmann, Heinz

Publication type:

Article

Sunspot Numbers from ISOON: A Ten-Year Data Analysis.

Published in:

Solar Physics, 2016, v. 291, n. 9/10, p. 3123, doi. 10.1007/s11207-016-0874-5

By:

Balasubramaniam, K.;
Henry, T.

Publication type:

Article

An Early Sunspot Catalog by Miguel Aguilar for the Period 1914 - 1920.

Published in:

Solar Physics, 2016, v. 291, n. 9/10, p. 2609, doi. 10.1007/s11207-016-0905-2

By:

Lefèvre, L.;
Aparicio, A.;
Gallego, M.;
Vaquero, J.

Publication type:

Article