scholarly journals Is the new Grand minimum in progress?

2014 ◽  
Vol 119 (5) ◽  
pp. 3281-3285 ◽  
Author(s):  
N. V. Zolotova ◽  
D. I. Ponyavin
Keyword(s):  
Grand Minimum

scholarly journals A review of the SCOSTEP’s 5-year scientific program VarSITI—Variability of the Sun and Its Terrestrial Impact

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Kazuo Shiokawa ◽  
Katya Georgieva
Keyword(s):  
Solar Wind ◽  
Interplanetary Space ◽  
Solar Wind Plasma ◽  
The Sun ◽  
Scientific Program ◽  
Solar Cycles ◽  
Grand Minimum ◽  
The Earth ◽  
Earth Connection ◽  
Near Future

AbstractThe Sun is a variable active-dynamo star, emitting radiation in all wavelengths and solar-wind plasma to the interplanetary space. The Earth is immersed in this radiation and solar wind, showing various responses in geospace and atmosphere. This Sun–Earth connection variates in time scales from milli-seconds to millennia and beyond. The solar activity, which has a ~11-year periodicity, is gradually declining in recent three solar cycles, suggesting a possibility of a grand minimum in near future. VarSITI—variability of the Sun and its terrestrial impact—was the 5-year program of the scientific committee on solar-terrestrial physics (SCOSTEP) in 2014–2018, focusing on this variability of the Sun and its consequences on the Earth. This paper reviews some background of SCOSTEP and its past programs, achievements of the 5-year VarSITI program, and remaining outstanding questions after VarSITI.

scholarly journals Ultraviolet Flux Decrease Under a Grand Minimum from IUE Short-wavelength Observation of Solar Analogs

2017 ◽  
Vol 852 (1) ◽  
pp. L4 ◽  
Author(s):  
Dan Lubin ◽  
Carl Melis ◽  
David Tytler
Keyword(s):  
Short Wavelength ◽  
Grand Minimum ◽  
Solar Analogs

scholarly journals Is meridional circulation important in modelling irregularities of the solar cycle?

2011 ◽  
Vol 7 (S286) ◽  
pp. 367-371 ◽  
Author(s):  
Bidya Binay Karak ◽  
Arnab Rai Choudhuri
Keyword(s):  
Solar Cycle ◽  
Convection Zone ◽  
Meridional Circulation ◽  
Dynamo Model ◽  
Turbulent Diffusivity ◽  
Flux Transport ◽  
Grand Minimum

AbstractWe explore the importance of meridional circulation variations in modelling the irregularities of the solar cycle by using the flux transport dynamo model. We show that a fluctuating meridional circulation can reproduce some features of the solar cycle like the Waldmeier effect and the grand minimum. However, we get all these results only if the value of the turbulent diffusivity in the convection zone is reasonably high.

scholarly journals The Maunder minimum (1645–1715) was indeed a grand minimum: A reassessment of multiple datasets

2015 ◽  
Vol 581 ◽  
pp. A95 ◽  
Author(s):  
Ilya G. Usoskin ◽  
Rainer Arlt ◽  
Eleanna Asvestari ◽  
Ed Hawkins ◽  
Maarit Käpylä ◽  
...  
Keyword(s):  
Maunder Minimum ◽  
Grand Minimum ◽  
Multiple Datasets

scholarly journals Gradual onset of the Maunder Minimum revealed by high-precision carbon-14 analyses

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hiroko Miyahara ◽  
Fuyuki Tokanai ◽  
Toru Moriya ◽  
Mirei Takeyama ◽  
Hirohisa Sakurai ◽  
...  
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
High Precision ◽  
Crop Yields ◽  
Maunder Minimum ◽  
The Sun ◽  
Solar Cycles ◽  
Precision Data ◽  
Carbon 14 ◽  
Grand Minimum

AbstractThe Sun exhibits centennial-scale activity variations and sometimes encounters grand solar minimum when solar activity becomes extremely weak and sunspots disappear for several decades. Such an extreme weakening of solar activity could cause severe climate, causing massive reductions in crop yields in some regions. During the past decade, the Sun’s activity has tended to decline, raising concerns that the Sun might be heading for the next grand minimum. However, we still have an underdeveloped understanding of solar dynamo mechanisms and hence precise prediction of near-future solar activity is not attained. Here we show that the 11-year solar cycles were significantly lengthened before the onset of the Maunder Minimum (1645–1715 CE) based on unprecedentedly high-precision data of carbon-14 content in tree rings. It implies that flow speed in the convection zone is an essential parameter to determine long-term solar activity variations. We find that a 16 year-long cycle had occurred three solar cycles before the onset of prolonged sunspot disappearance, suggesting a longer-than-expected preparatory period for the grand minimum. As the Sun has shown a tendency of cycle lengthening since Solar Cycle 23 (1996–2008 CE), the behavior of Solar Cycle 25 can be critically important to the later solar activity.

Grand Minimum of the Total Solar Irradiance Leads to the Little Ice Age

2012 ◽  
Vol 02 (02) ◽  
Author(s):  
Habibullo I Abdussamatov
Keyword(s):  
Solar Irradiance ◽  
Little Ice Age ◽  
Total Solar Irradiance ◽  
Ice Age ◽  
Grand Minimum

On the effect of a new grand minimum of solar activity on the future climate on Earth

2010 ◽  
Vol 37 (5) ◽  
pp. n/a-n/a ◽  
Author(s):  
Georg Feulner ◽  
Stefan Rahmstorf
Keyword(s):  
Solar Activity ◽  
Future Climate ◽  
Grand Minimum ◽  
The Future
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