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solar activity

Diagram showing the Earth reflecting solar energy
Posted inEditors' Highlights

Updated Reference Standard for Total Solar Irradiance

by Astrid Maute 29 March 202327 March 2023

Version 2 of the Total and Spectral Solar Irradiance Sensor-1 Hybrid Solar Reference Spectrum captures a spectral resolution spanning 0.115-200 micrometers and integrates nearly 100% of the TSI energy.

Photograph of the ionosphere taken from the International Space Station.
Posted inEditors' Vox

The International Reference Ionosphere – A Model Ionosphere

by Dieter Bilitza 15 February 202321 February 2023

An accurate and reliable description of Earth’s ionosphere is of critical importance because of our increased reliance on satellite technology and the significant impact the ionosphere has on it.

Posted inEditors' Highlights

Origin of Dawnside Subauroral Plasma Flows in Geomagnetic Storms

by Susan Trumbore 12 September 202218 October 2022

Geomagnetic storms induce fast plasma flows next to the aurora and affect space weather. Lin et al. explain the origin of a special “dawnside” plasma stream that occurs only during extreme storm events.

An illustration of the Solar Orbiter positioned in front of the Sun.
Posted inAGU News

Brighter Skies Ahead

Heather Goss, AGU Publisher by Heather Goss 25 August 202217 January 2023

As solar max approaches, new tech is on call.

Diagram showing the interior of the Sun
Posted inFeatures

Shake, Rattle, and Probe

Damond Benningfield, Science Writer by Damond Benningfield 25 August 202217 January 2023

Helioseismology allows scientists to study the interior of the Sun, solve some basic physics mysteries, and forecast space weather.

We are in the middle of solar cycle 25, which means that the Sun has been slowly ramping up its sunspot and flare activity for the past few years.
Posted inFeatures

11 Discoveries Awaiting Us at Solar Max

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 25 August 202230 September 2022

Each solar cycle might seem like the same old story, but one thing has changed significantly since the previous solar maximum–our technology.

The Sun, a round orange orb, is observed through an ultraviolet filter that gives its surface a mottled deep orange look. There are a few prominences along the edge of the circular disk and one loop at around one o’clock, but there are no sunspots visible on the surface.
Posted inNews

Why Did Sunspots Disappear for 70 Years? Nearby Star Holds Clues

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 10 June 202227 March 2023

Five decades of data revealed a star undergoing a pause in magnetic activity similar to what the Sun experienced almost 400 years ago.

A poof of red and yellow light shoots out of a dark red and black star
Posted inNews

Coronal Dimmings Shine Light on Stellar CMEs

Jenessa Duncombe, Staff Writer by Jenessa Duncombe 6 June 202225 August 2022

Coronal mass ejections from stars have eluded easy observation, so scientists are looking at what’s left behind.

An image of the Sun showing an eruption of solar material from the Sun’s left side.
Posted inNews

Chinese-Led Solar Research Is Looking Bright

Katherine Kornei, Science Writer by Katherine Kornei 24 May 202210 March 2023

With new missions underway and planned, China is stepping up to observe our nearest stellar neighbor.

An illustration of the Solar Orbiter spacecraft near the Sun.
Posted inScience Updates

A New Journey Around (and Around) the Sun

by Daniele Telloni, Francesco Valentini and Raffaele Marino 25 February 202231 January 2023

The Solar Orbiter just completed its commissioning phase while en route to the Sun. It has already provided valuable looks at solar campfires and Venus’s magnetic fields, and it promises much more.

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