Results 261 to 270 of about 3,012 (284)

An estimate of the peak sunspot number in 1968

Journal of Atmospheric and Terrestrial Physics, 1960
Abstract An examination has been made of some statistical properties of the twenty peaks in the relative sunspot number which have occurred since 1750. The frequency distributions of R and ΔR and the autocorrelation function have made it possible to forecast the magnitude of the next peak which will probably occur in about 1968.
openaire   +1 more source

Monthly Mean Sunspot Numbers

1985
Daily relative sunspot numbers are based upon counts of spots and group entities of spots on the sun’s surface at some time each day. Wolf devised a relative number with the intent of reducing the spot counts of different observers and telescopes to a common basis.
D. F. Andrews, A. M. Herzberg
openaire   +1 more source

On the statistics of maximum sunspot numbers

Journal of Atmospheric and Solar-Terrestrial Physics, 1998
Abstract On the basis of the statistics of extremes (i.e. Gumbels first asymptotic distribution)and the characteristics of cycles 9–22 (the most reliable sunspot cycles) the magnitude of the cyclepeaks is studied. The analysis is based on the quasi-periodic solar activity which has a main periodof approximately 22 years.
openaire   +1 more source

Rome rainfall and sunspot numbers

Journal of Atmospheric and Terrestrial Physics, 1993
Abstract The accumulated departure from mean (ADM) of the 208 yr Rome rainfall strongly inversely resembles the ADM of sunspot numbers. The ADM for the Bay of Biscay sea surface temperature also strongly resembles sunspot numbers and Rome rainfall. These data suggest that long-term increasing solar radiation warms parts of the North Atlantic Ocean ...
openaire   +1 more source

Sunspot Number and the Refractivity of the Air

Nature, 1934
IN connexion with the note by L. W. Tilton on the relation between the sunspot number and refractivity of dry air1, it is of interest to examine whether such a relation may be deduced from the astronomical observations. For this purpose we have selected twenty independent determinations of the refraction constant () and reduced them to 0° C., 760 mm ...
openaire   +1 more source

Hemispheric asymmetry of long-term sunspot activity: sunspot relative numbers for 1939–2019

Monthly Notices of the Royal Astronomical Society, 2022
L H Deng
exaly  

Sunspot numbers can detect pandemic influenza A: The use of different sunspot numbers

Medical Hypotheses, 2007
J.M. Vaquero, M.C. Gallego
openaire   +1 more source

Sunspot number

Planetary and Space Science, 1992
openaire   +1 more source

Periodicity of sunspot activity in the modern solar cycles

Science Bulletin, 2013
K J Li
exaly  

A note on the relationship between sunspot numbers and active days

Advances in Space Research, 2014
J M Vaquero
exaly