scholarly journals Radiocarbon Activity Variation in Dated Tree Rings Grown in Mackenzie Delta

Radiocarbon ◽  
1986 ◽  
Vol 28 (2A) ◽  
pp. 300-305 ◽  
Author(s):  
C Y Fan ◽  
Chen Tie-Mei ◽  
Yun Si-Xun ◽  
Dai Kai-Mei
Keyword(s):  
Solar Activity ◽  
Tree Rings ◽  
Solar Flares ◽  
Activity Cycle ◽  
White Spruce ◽  
Solar Activity Cycle ◽  
Mackenzie Delta ◽  
Activity Variation

We measured the Δ14C values in 57 rings (from AD 1824 to 1880) of a white spruce grown in Mackenzie Delta (68°N, 130°W), as part of our continuing study of the Δ14C variation related to solar activities. The values exhibit a 10‰ fluctuation with an 11-year periodicity anti-correlated with the solar activity cycle. We also measured the Δ14C values in 6 rings (from AD 1940 to 1945). The abnormally high value in the 1943 ring may be due to two large solar flares occurring in 1942.

Solar Energetic Particle Events at the Rise Phase of the 23rd Solar Activity Cycle Registered aboard the Spacecraft “INTERBALL-2”

2000 ◽  
Vol 179 ◽  
pp. 251-254
Author(s):  
Vladislav Timofeev ◽  
Sergey Starodubtsev
Keyword(s):  
Solar Activity ◽  
Solar Flares ◽  
Energetic Particle ◽  
Solar Energetic Particle ◽  
Activity Cycle ◽  
Solar Activity Cycle ◽  
Solar Energetic Particle Events ◽  
Mass Ejection ◽  
Rise Phase ◽  
23Rd Solar Activity Cycle

AbstractThe experiment with 10K-80 aboard the INTER-BALL-2 (which detects protons with energies > 7, 27–41, 41–58, 58–88, 88–180 and 180–300 MeV) registered six events of the solar energetic particle (SEP) increase. These events are during the initial rise phase of the 23rd solar activity cycle. Solar flares with the SEP generation are accompanied by coronal mass ejection (CME). Here we analyze the dynamics of the differential energy spectrum at different phases of the SEP increase.

scholarly journals Radiocarbon Activity Variation in Dated Tree Rings Grown in Mackenzie Delta

Radiocarbon ◽  
1983 ◽  
Vol 25 (2) ◽  
pp. 205-212 ◽  
Author(s):  
C Y Fan ◽  
Chen Tie-Mei ◽  
Yun Si-Xun ◽  
Dai Kai-Mei
Keyword(s):  
Tree Rings ◽  
Liquid Scintillation ◽  
White Spruce ◽  
Mackenzie Delta ◽  
Sunspot Numbers ◽  
Physical Implication ◽  
Activity Variation ◽  
Peking University ◽  
Data Points ◽  
History Department

Forty-five tree rings (1881–1925) were taken from a white spruce grown near Campbell River in Mackenzie Delta, Canada, for the measurement of 14C activity variation. Because of the narrowness of the rings, 2 and sometimes 3 rings were combined to yield a total of 21 specimens. The 14C content in these specimens was measured with a liquid scintillation-PM tube counter system of the History Department of Peking University. The data points exhibit a 10‰ variation, anti-correlated with sunspot numbers. The physical implication is discussed.

Trends in Parameters of the F2 Layer and the 24th Solar-Activity Cycle

2020 ◽  
Vol 60 (5) ◽  
pp. 586-596 ◽  
Author(s):  
A. D. Danilov ◽  
A. V. Konstantinova
Keyword(s):  
Solar Activity ◽  
Activity Cycle ◽  
Solar Activity Cycle

scholarly journals On the Prediction of Solar Cycles

Solar Physics ◽  
2021 ◽  
Vol 296 (1) ◽  
Author(s):  
V. Courtillot ◽  
F. Lopes ◽  
J. L. Le Mouël
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Transfer Function ◽  
Singular Spectrum Analysis ◽  
Activity Cycle ◽  
Solar Activity Cycle ◽  
Planetary Motion ◽  
Data Sets ◽  
Solar Cycles ◽  
Jovian Planets

AbstractThis article deals with the prediction of the upcoming solar activity cycle, Solar Cycle 25. We propose that astronomical ephemeris, specifically taken from the catalogs of aphelia of the four Jovian planets, could be drivers of variations in solar activity, represented by the series of sunspot numbers (SSN) from 1749 to 2020. We use singular spectrum analysis (SSA) to associate components with similar periods in the ephemeris and SSN. We determine the transfer function between the two data sets. We improve the match in successive steps: first with Jupiter only, then with the four Jovian planets and finally including commensurable periods of pairs and pairs of pairs of the Jovian planets (following Mörth and Schlamminger in Planetary Motion, Sunspots and Climate, Solar-Terrestrial Influences on Weather and Climate, 193, 1979). The transfer function can be applied to the ephemeris to predict future cycles. We test this with success using the “hindcast prediction” of Solar Cycles 21 to 24, using only data preceding these cycles, and by analyzing separately two 130 and 140 year-long halves of the original series. We conclude with a prediction of Solar Cycle 25 that can be compared to a dozen predictions by other authors: the maximum would occur in 2026.2 (± 1 yr) and reach an amplitude of 97.6 (± 7.8), similar to that of Solar Cycle 24, therefore sketching a new “Modern minimum”, following the Dalton and Gleissberg minima.

Sign in / Sign up

Export Citation Format

Share Document