Solar cycle

Because the solar cycle reflects magnetic activity, various magnetically driven solar phenomena follow the solar cycle, including sunspots, faculae/plage, network, and coronal mass ejections.

2024 Mar 28

Solar Cycle Progression Updated Prediction (Experimental):

Numbered solar cycles begin in the mid-18th century, with the quality and frequency of observations increasing substantially since the early 19th century. We are currently in Solar

2024 Oct 10

Solar Cycle Progression Page Has Changed

As part of the Space Weather Prediction Center''s rollout of our improved website, the content from the Solar Cycle Progression page is being provided in a new way.

2025 Apr 15

Solar Cycle – Definition & Detailed Explanation

What is a Solar Cycle? The solar cycle is the approximately 11-year period of change in the Sun''s activity levels. This cycle is characterized by the rise and fall of sunspots,

2024 Jul 04

Solar cycle

Each month the solar prediction is updated using historical and the latest month''s observed solar indices to provide estimates for the

2024 Sep 19

Solar Cycle Progression and Forecast

Each month the solar prediction is updated using historical and the latest month''s observed solar indices to provide estimates for the balance of the current solar cycle and the

2025 Mar 16

NOAA forecasts quicker, stronger peak of solar activity

The updated prediction now calls for Solar Cycle 25 to peak between January and October of 2024, with a maximum sunspot number between 137 and 173. The prediction marks the debut

2024 May 13

Solar Cycle progression | Solar activity | SpaceWeatherLive

In this paper we describe how the Space Weather Prediction Center (SWPC), as a division of the National Oceanic and Atmospheric Administration (NOAA), currently addresses

2024 Aug 14

Solar Cycle Prediction at NOAA''s Space Weather Prediction Center

In this paper we describe how the Space Weather Prediction Center (SWPC), as a division of the National Oceanic and Atmospheric Administration (NOAA), currently addresses

2025 Feb 26

NOAA forecasts quicker, stronger peak of solar

The updated prediction now calls for Solar Cycle 25 to peak between January and October of 2024, with a maximum sunspot number between

2024 Oct 02

Solar cycle | Definition, Length, & Facts | Britannica

Solar cycle, period of about 11 years in which fluctuations in the number and size of sunspots and solar prominences are repeated. Solar cycle 25

2025 Jan 30

Solar Cycle progression | Solar activity | SpaceWeatherLive

The graph below shows you the number of C, M and X-class solar flares that were produced during past month together with the sunspot number of each day. This gives you an idea of the

2024 Aug 01

Solar Cycle Progression | NOAA / NWS Space Weather

In October 2023 the updated prediction for Solar Cycle 25 was made available to the public as an experimental product on the Space Weather Prediction Testbed. After a

2025 Oct 19

Solar cycle | Definition, Length, & Facts | Britannica

Solar cycle, period of about 11 years in which fluctuations in the number and size of sunspots and solar prominences are repeated. Solar cycle 25 began in 2019 and will reach maximum in

2026 Jan 24

View/Download Public solar cycle system [PDF]

PDF version includes complete article with source references. Suitable for printing and offline reading.