Results 241 to 250 of about 1,248,900 (279)

Influence of geomagnetic disturbances on myocardial infarctions in women and men from Brazil. [PDF]

Commun Med (Lond)
Rezende LFC, De Paula ER, Muella MTAH, Dutra SLG, Rosa RR, Saldiva PHN, Ometto JPHB.   +6 more
europepmc   +1 more source

The solar dynamo begins near the surface. [PDF]

Nature
Vasil GM, Lecoanet D, Augustson K, Burns KJ, Oishi JS, Brown BP, Brummell N, Julien K.   +7 more
europepmc   +1 more source

Extraction of metadata from solar disk H-alpha observations at Sacramento Peak Observatory. [PDF]

Sci Data
Illarionov EA, Yukui W, Pevtsov AA.
europepmc   +1 more source

Wavelets in the analysis of local time series of the Earth's surface air. [PDF]

Heliyon
Volvach A, Kurbasova G, Volvach L.
europepmc   +1 more source

Statistical analysis and forecasting of solar wind parameters across solar cycles. [PDF]

Sci Rep
He M, Zhu H.
europepmc   +1 more source

Historical sunspot records [PDF]

Living Reviews in Solar Physics, 2020
Sunspot observations are available in fairly good numbers since 1610, after the invention of the telescope. This review is concerned with those sunspot observations of which longer records and drawings in particular are available.
José M Vaquero
exaly   +2 more sources

Revisiting the Sunspot Number [PDF]

Space Science Reviews, 2014
Our knowledge of the long-term evolution of solar activity and of its primary modulation, the 11-year cycle, largely depends on a single direct observational record: the visual sunspot counts that retrace the last 4 centuries, since the invention of the astronomical telescope.
Frédéric Clette, Edward Cliver, Leif Svalgaard   +2 more
exaly   +4 more sources

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Group Sunspot Numbers: Sunspot Cycle Characteristics

Solar Physics, 2002
We examine the "Group" sunspot numbers constructed by Hoyt and Schatten to determine their utility in characterizing the solar activity cycle. We compare smoothed monthly Group Sunspot Numbers to Zurich (International) Sunspot Numbers, 10.7-cm radio flux, and total sunspot area.
David H Hathaway, Robert M Wilson
exaly   +2 more sources

Synchronization of Sunspot Numbers and Sunspot Areas

Solar Physics, 2009
Sunspot activity is usually described by either sunspot numbers or sunspot areas. The smoothed monthly mean sunspot numbers (SNs) and the smoothed monthly mean areas (SAs) in the time interval from November 1874 to September 2007 are used to analyze their phase synchronization.
K. J. Li, P. X. Gao, L. S. Zhan
openaire   +1 more source

Investigation of Sunspot Area Varying with Sunspot Number

Solar Physics, 2016
The statistical relationship between sunspot area (SA) and sunspot number (SN) is investigated through analysis of their daily observation records from May 1874 to April 2015. For a total of 1607 days, representing $3~\%$
K. J. Li, F. Y. Li, J. Zhang, W. Feng
openaire   +1 more source