Large Solar Cycle Mode

Assessment of the 11-year solar cycle signals in the middle

Abstract. To better understand possible reasons for the diverse modeling results and large discrepancies of the detected solar fingerprints, we took one step back and assessed the "initial" solar signals in the middle atmosphere based on large ensemble simulations with multiple climate models — FOCI, EMAC, and MPI-ESM-HR. Consistent with previous work,

Solar cycle as a distinct line of evidence constraining

Solar cycle as a distinct line of evidence constraining Earth''s transient climate response. The large r negative v alues are. from mode ls that donot have adequatespin-up of thei r oceans

List of solar storms

An extreme storm, estimated at Dst −531 nT arose from a fast CME (mean ≈1500 km/s), occurred during the ascending phase of the minimum of the relatively weak solar cycle 14, which is the most significant storm on record in a solar

11-Year solar cycle in the stratosphere extracted by the empirical mode

2002). During these winter months, the solar cycle signal is weak compared to large atmospheric varia-tions and the signal is therefore more difficult to ex-tract (Labitzke, 1987; Labitzke and van Loon, 1988; The fourth mode is a clear solar cycle

Current Solar Cycle 25 on the Eve of the Maximum Phase

Abstract— Since January 2020, the current solar cycle 25 has begun. Its development in the first four years, according to the Gnevyshev–Ohl rule, brought it into the family of medium-sized cycles. In November 2023, it entered the maximum phase. Therefore, the maximum of the current cycle should take place no later than June 2024 with the expected

Solar large-scale magnetic field and cycle patterns in solar

V N Obridko, V V Pipin, D Sokoloff, A S Shibalova, Solar large-scale magnetic field and cycle patterns in solar dynamo, Monthly Notices of the Royal Astronomical Society, Volume 504, Issue 4, July 2021, The nominal 11(22)-yr cycle as recorded in each mode has a specific phase shift varying from cycle to cycle; the actual length of the cycle

The 8‐Year Solar Cycle During the Maunder Minimum

The 11-year solar cycle (Schwabe cycle) is the dominant pattern of solar magnetic activity reflecting the oscillatory dynamo mechanism in the Sun''s convection zone.

THE “TWIN-CME” SCENARIO AND LARGE SOLAR ENERGETIC

The above discussion suggests that large SEP events can be very complicated. In this work, using observations of large SEP events and fastCMEs in solar cycle 23, we examine if the “twin-CME” scenario also operates in large SEP events. We focus on the data set of large SEP events and fast CMEs in solar cycle 23

9.2: The Solar Cycle

Sunspots. The first evidence that the Sun changes came from studies of sunspots, which are large, dark features seen on the surface of the Sun caused by increased magnetic activity.They look darker because the spots are

Detecting Relationship between the

The sun plays a crucial role as the primary source of energy for the Earth''s climate system and the issue of the influence of solar activity on the climate has been actively

Large solar energetic particle events of cycle 23: A

We report on a study of all the large solar energetic particle (SEP) events that occurred during the minimum to maximum interval of solar cycle 23. The main results are: 1. The occurrence rate of the SEP events, long

phenomenology of solar-cycle-induced acoustic eigenfrequency variations

The phenomenology of solar p-mode shifts, as extracted from the analysis of GONG, BiSON and LOI data. The plotted shifts are those inferred between the minimum and maximum of the solar activity cycle. Upper left-hand panel, the raw, extracted shifts, averaged over the indicated ranges in l, as a function of frequency.

The sun in 2025: How the solar cycle will shape our year ahead

By historical definition, Solar Cycle 1 occurred between 1755 and 1766, placing the sun''s current cycle in Solar Cycle 25. As of the end of 2024, we are firmly within the solar maximum period.

Models for the long-term variations of solar activity

By long-term variations, we mean the cycle modulations beyond the 11-year periodicity and these include, the Gnevyshev–Ohl/Even–Odd rule, grand minima, grand maxima, Gleissberg cycle, and Suess cycles. After a brief review of the observed data, we present the

Earth-affecting solar transients: a review of progresses in solar cycle

Solar cycle 24 is known to be weaker than previous several solar cycles, which is the focus of many studies during the VarSITI program. A weak solar cycle 24 is understood to be due to the weak polar magnetic field in the preceding solar minimum according to the Babcock Leighton Mechanism of the solar cycle (see e.g., Petrovay 2010). A weak

Influence of the solar cycle and QBO modulation on the Southern

Influence of the 11-year solar cycle and the stratospheric equatorial Quasi-Biennial Oscillation (QBO) on the Southern Annular Mode (SAM) in late winter/spring is examined through the analysis of combined reanalysis data of ECMWF. It is found that the signal is strongly affected by both the solar cycle and the QBO. Regarding the effect of the solar cycle, the

Solar cycle prediction using a long short-term memory

A deep-learning Vanilla, or single layer, Long Short-Term Memory model is proposed for improving the prediction of Solar Cycle 25 and suggests that the Cycle 25 will peak in April 2023 with an amplitude value of 136.9, which will be approximately 17.68% stronger compared with Cycle 24.

Solar activity cycle 25: the first three years

Solar cycle 25, unlike cycle 24, exhibits the most significant increase in the number of sunspot groups with areas up to 30 pmh and in the interval from 570 to 1000 pmh.

Influence of the Solar Cycle on the North Atlantic Oscillation

Satellite observations of the 11-year solar cycle have shown only very small changes (∼0.1%) in solar irradiance (Kopp & Lean, 2011), but large changes of 4%–8% in the 200–250 nm wavelength range of the ultraviolet (UV) spectrum (Lean et al., 1997). Therefore, there is a well-documented 11-year cycle of the solar-induced temper-

Study on integrated solar combined cycle system with

Integrated solar combined cycle (ISCC) system, which integrates solar thermal energy into traditional gas turbine combined cycle (GTCC) system, has become an efficient way to reduce the levelized cost of

Thermodynamic performances of a novel multi-mode solar

In recent years, spurred by societal advancements and the relentless march of science and technology, there has been a notable surge in the global demand for energy and electricity .Currently, the global energy landscape is predominantly characterized by the dominance of high‑carbon fossil fuels, with approximately 70 % of power generation sourced

The change of the solar cyclicity mode

We studied the variations of the physical parameters of sunspots in a Gleissberg cycle. At the maximum phase of the Gleissberg cycle, the average area of groups and the

Title: Models for the long-term variations of solar activity

In this article, we review the dynamo models for the long-term variations of the solar cycle. By long-term variations, we mean the cycle modulations beyond the 11-year

Life cycle assessment of large-scale solar photovoltaic irrigation

In this work, the life cycle assessment (LCA) of a large solar photovoltaic plant of 6 MWp of an irrigation district, located in southern Spain, has been carried out. From the analysis of the data provided, energy payback time (EPBT) between 3.51 and 3.81 years, and carbon payback time (CPBT) between 3.39 and 3.67 years were determined.

Evolution of solar wind sources and coronal rotation driven by the

The strength and morphology of the Sun''s magnetic field evolve significantly during the solar cycle, with the overall polarity of the Sun''s magnetic field reversing during the maximum of solar activity. An example of this is shown during cycle 24, when the axisymmetric mode grows due to the large southern pole-ward surge. This has

Dynamo models of the solar cycle

Dynamo models of the solar cycle Paul Charbonneau 1 Received: 16 December 2019/Accepted: 12 May 2020/Published online: 17 June 2020 solar convection generating solar-like large-scale magnetic

Solar cycle

OverviewDefinitionObservational historyCycle historyPhenomenaPatternsEffectsSolar dynamo

The Solar cycle, also known as the solar magnetic activity cycle, sunspot cycle, or Schwabe cycle, is a periodic 11-year change in the Sun''s activity measured in terms of variations in the number of observed sunspots on the Sun''s surface. Over the period of a solar cycle, levels of solar radiation and ejection of solar material, the number and size of sunspots, solar flares, and coronal loops all exhibit a sy

[2305.19803] Solar Cycle Observations

We describe the defining observations of the solar cycle that provide constraints for the dynamo processes operating within the Sun. Specifically, we report on the following topics: historical sunspot numbers and revisions; active region (AR) flux ranges and lifetimes; tilt angles; Hale and Joy''s law; the impact of rogue ARs on cycle progression; the spatio-temporal

NASA SVS | Notable CMEs of Solar Cycle 24

Simulations & visualizations of some of the big solar events of Solar Cycle 24. These visualizations were developed to present a more public-friendly view in a way that the major events of space weather, such as coronal

The large-scale solar variability through the cycle

It is very tempting to say that we are in the presence of two strongly coupled cycles : a magnetic cycle and a convective pulsating cycle. They vary in phase and their

Solar large-scale magnetic field and cycle patterns in solar dynamo

The main idea is to study the phase relation between the evolution of different ℓ modes at the surface and to compare the results of observations with the results of the

(PDF) Long-Term Modulation of Solar Cycles

We propose a self-consistent explanation of Rieger-type periodicities, the Schwabe cycle, and the Suess-de Vries cycle in terms of resonances of various wave phenomena with gravitational forces...

The Sun''s Large-Scale Flows I: Measurements of

Newton and Nunn measured the rotation rate of sunspots from 1934 to 1944 (i.e., Solar Cycle 17) using the sunspot record of the Royal Greenwich Observatory.They found a sidereal rotation rate with the coefficients (A = 14.38) ° day −1 and (B = 2.96) ° day −1.Their measurements were in good agreement with those of Carrington (though it included a

Long-Term Modulation of Solar Cycles | Space Science Reviews

Solar activity has a cyclic nature with the ≈11-year Schwabe cycle dominating its variability on the interannual timescale. However, solar cycles are significantly modulated in

Solar-cycle variations of large frequency separations of acoustic

In this article, we review our current understanding of solar convection and the large-scale flows present in the Sun, including those associated with the recently discovered

More about solar g modes | Astronomy & Astrophysics (A&A)

Power spectrum of the p-mode large separation measured from 16.5 yr of GOLF data (Fig. 7 of paper I). Appendix B Detection of modes of degree 3. This is presumably due to the fact that the first years contain the maximum of the solar cycle 23, that was high, while the second part contains theminimum and the rising part of the weaker cycle

Large solar energetic particles and solar radio emissions during Cycle

Large solar energetic particles and solar radio emissions during Cycle 25. A comparative analysis of trends and characteristics with cycles 23 and 24 Using records that encompass the rising period of solar cycle 25, the present study adds to earlier research. Our immediate objective is to study large SEP events (SEPs with intensity

What Is the Solar Cycle? | NASA Space Place – NASA Science for

The beginning of a solar cycle is a solar minimum, or when the Sun has the least sunspots. Over time, solar activity—and the number of sunspots—increases. The middle of the solar cycle is the solar maximum, or when the Sun has the most sunspots. As the cycle ends, it fades back to the solar minimum and then a new cycle begins.

When is a trend meaningful? Insights to carbon cycle

We use an initial-condition large ensemble of simulations with the Community Earth System Model (CESM2) to show that ICV produces a range of outcomes in the terrestrial carbon cycle.