Space & Beyond • Solar Activity • Space Weather • Earth–Sun Interactions
Solar and space weather describes the constantly changing activity of the Sun and its effects across Earth, spacecraft, satellites, power grids, communications systems, navigation networks and Earth’s upper atmosphere.
From solar flares, coronal mass ejections (CMEs), geomagnetic storms and cosmic radiation to radio blackouts, magnetic disturbances and solar-cycle shifts, space weather connects deep solar physics to real-world consequences on Earth.
This Strange Sounds sub-hub explores how solar activity shapes near-Earth space, how extreme solar storms can disrupt technology, why cosmic radiation changes over time, and how solar cycles influence Earth’s magnetic environment and atmospheric behavior.
Auroras and plasma sky phenomena are strongly connected to geomagnetic storms, but are explored primarily within the Strange Sky & Plasma Phenomena cluster, where visual atmospheric effects and luminous sky anomalies are covered in greater depth.
TL;DR
- Space weather is driven mainly by solar activity.
- Solar flares and CMEs can disrupt satellites,
GPS and communications. - Geomagnetic storms affect Earth’s magnetic field and infrastructure.
- Cosmic radiation changes during solar-cycle shifts.
- Extreme solar storms could threaten global technology systems.
- The Sun follows repeating activity cycles roughly every 11 years.
- Auroras are a visible consequence of geomagnetic activity.
What is space weather?
Space weather describes changing conditions in near-Earth space caused mainly by activity from the Sun.
The Sun constantly emits:
- charged particles
- solar wind
- magnetic fields
- electromagnetic radiation
When intense solar activity interacts with Earth, it can produce both spectacular and disruptive effects.
Solar activity and solar cycles
The Sun follows repeating activity cycles lasting approximately 11 years.
During solar maximum:
- sunspots increase
- solar flares intensify
- CMEs become more frequent
- geomagnetic storms increase
During solar minimum:
- solar activity weakens
- sunspot counts decline
- cosmic-ray penetration often increases
Long-term solar variability strongly influences Earth’s space environment.
Solar storms and geomagnetic impacts
Geomagnetic storms occur when powerful solar eruptions disturb Earth’s magnetic field.
Major geomagnetic storms can produce:
- power-grid instability
- satellite failures
- GPS disruption
- aviation communication problems
- radio blackouts
Historic benchmark events include:
- The Carrington Event (1859)
- The Quebec Blackout Storm (1989)
- The Halloween Storms (2003)
Explore more in: Solar Storms & Geomagnetic Impacts Explained.
Solar flares, CMEs and filament eruptions
Solar flares are sudden bursts of electromagnetic radiation released from the Sun.
Coronal mass ejections (CMEs) are massive eruptions of magnetized plasma launched into space.
Filament eruptions occur when large magnetic plasma structures destabilize and erupt from the solar surface.
These events can trigger:
- geomagnetic storms
- radiation storms
- auroras
- communication disruptions
- satellite damage
Explore more in: Solar Flares, CMEs & Filament Eruptions Explained.
Cosmic rays and Earth interaction
Cosmic rays are highly energetic particles traveling through space.
Some originate from:
- supernovae
- black holes
- solar eruptions
- deep-space events
Cosmic radiation interacts continuously with Earth’s atmosphere and magnetic field.
Scientists monitor cosmic-ray changes because they may influence:
- aviation radiation exposure
- electronics
- atmospheric ionization
- spacecraft systems
Explore more in: Cosmic Rays & Earth Interaction Explained.
How space weather affects technology
| Technology | Potential Space Weather Effect |
|---|---|
| Satellites | Radiation damage and orbital drag |
| GPS systems | Navigation errors and signal disruption |
| Power grids | Geomagnetically induced currents |
| Radio communications | Blackouts and interference |
| Aviation | Radiation exposure and communication issues |
Extreme space weather risks
Scientists consider extreme solar storms among the most serious natural threats to modern technological civilization.
Potential consequences include:
- global communications disruption
- satellite failures
- large-scale blackouts
- internet infrastructure damage
- navigation system failures
Frequently Asked Questions
What is space weather?
Space weather describes changing solar and cosmic conditions affecting Earth and near-Earth space.
Can solar storms damage Earth?
Strong solar storms can disrupt satellites, power grids, communications and navigation systems.
What is a coronal mass ejection?
A CME is a massive eruption of magnetized plasma from the Sun.
Do solar storms cause auroras?
Yes. Geomagnetic storms triggered by solar activity often produce auroral displays.
Are cosmic rays dangerous?
High-energy cosmic radiation can affect electronics, aviation and spacecraft systems.
Could a solar storm shut down the internet?
An extreme geomagnetic storm could potentially damage communications infrastructure and global networks.
