Space weather

The sun can change things in space.

It sends out big clouds. These clouds can move near Earth. They can make pretty lights in the sky.

These lights are called aurorae.

Space weather can also mess with our tools. It can hurt machines on spacecraft. It can make radio signals hard to hear. It can even change how satellites move.

Sometimes, the sun sends out a big burst. This burst can hit our world. It can make the air around Earth get hot. This heat can push on satellites.

This can make satellites fall lower. They might even fall toward Earth. This is why we watch the sun. We want to keep our tools safe.

Space weather describes the changing conditions in our solar system.

It is a lot like the weather we feel on Earth. Instead of rain, it involves the solar wind. This is a stream of particles from the sun.

Space weather can affect many things we use every day.

It can harm spacecraft. High-energy particles called radiation can pass through a ship's skin. This can cause errors in its computer. It can even break parts of the electronics. Particles can also build up a charge on a ship's surface. This is called spacecraft charging. If too much charge builds up, it can cause a spark.

Space weather also affects satellites in orbit. A geomagnetic storm can heat the upper air of Earth. This makes the air rise and expand. This extra air creates drag on a satellite. Drag is a force that slows things down. This can make a satellite fall to a lower orbit. It can even make it fall toward Earth. Space weather can also mess with GPS signals. This can make it hard for planes to navigate.

Space weather describes the changing conditions in our solar system.

It is a branch of space physics that studies the solar wind and its effects. This wind moves through the heliosphere, which is the space around our sun. Space weather is similar to the weather we see on Earth. Instead of rain or snow, it involves particles and magnetic changes. These changes can affect the Earth's magnetosphere and its upper layers of air. Scientists also study space climate to find long-term patterns in these events.

Space weather works through a chain of cause and effect. The sun sends out solar wind and magnetic fields. Sometimes, the sun has solar flares or coronal mass ejections. These big events can compress the Earth's magnetosphere. This can trigger a geomagnetic storm. These storms can also send high-energy particles toward Earth. These particles are called solar energetic particles, or SEP. They can cause radiation that is harmful to people and machines.

People have noticed these effects for a very long time. For many centuries, people saw beautiful aurorae in the sky. In 1724, George Graham saw a compass needle move unexpectedly. Later, in 1852, Edward Sabine found a link between sunspots and storms. In 1859, a huge solar storm caused bright lights and broke telegraphs. Richard Carrington saw a solar flare and connected it to the storm. By the 1950s, the term "space weather" began to be used.

Many important tools rely on a calm space environment. Communications satellites and GPS systems are vital for our world. Space weather can cause radiation damage to spacecraft electronics. It can also cause spacecraft charging, which is a buildup of electricity. This can lead to a spark that confuses a computer.

In 2003, 46 out of 70 reported spacecraft failures happened during a storm. Also, storms can heat the thermosphere, which makes air rise and create drag. This drag can pull satellites down toward Earth.

Space weather affects many things we use every day. It can even change how planes fly on polar routes. The ionosphere can bend radio waves like water bends light. This can make GPS signals hard to read.

To stay safe, groups like the US National Space Weather Program watch the sun. The ICAO also has a program to advise pilots. They work with agencies in the US, Australia, Canada, France, and Japan. They also work with groups in Europe and China. This helps keep our technology and travelers safe.

Space weather is a specialized branch of space physics and aeronomy. It is also known as heliophysics. This field studies the changing conditions within our Solar System and its heliosphere.

The heliosphere is the vast region of space influenced by the sun. Space weather involves the solar wind and its impact on Earth. It affects the magnetosphere, which is Earth's magnetic shield. It also impacts the ionosphere, thermosphere, and exosphere. These are the upper layers of our atmosphere. While space weather is physically different from Earth's weather, the two are quite similar. Earth's weather happens in the troposphere and stratosphere. Space weather happens in the vacuum of space.

Space weather occurs through a complex chain of physical processes. The sun constantly emits the solar wind. This is a stream of plasma carrying an interplanetary magnetic field. Sometimes, the sun undergoes much larger events. These include solar flares and coronal mass ejections. A coronal mass ejection is a massive burst of solar material. These events can compress the Earth's magnetosphere. This compression can trigger a geomagnetic storm.

These storms can also accelerate solar energetic particles, or SEP. These high-energy particles are a major driver of human-impact space weather. They can travel through space and reach our planet or our satellites.

There are several distinct ways space weather affects our technology. One major effect is radiation damage to spacecraft electronics. High-energy particles can pass through the outer skin of a spacecraft. This can cause a single event upset, which is an error in a signal. It can also cause a single-event latchup, which destroys electronic parts. Another effect is spacecraft charging. This happens when low-energy particles build up an electrostatic charge on a surface. If enough charge builds up, a spark or discharge occurs. This spark can confuse the spacecraft's computer.

Space weather can also change the physical environment of Earth's orbit. During a geomagnetic storm, the thermosphere absorbs extra heat. This causes the thermosphere to expand and rise higher into space. As the atmosphere rises, it creates more drag on satellites in low Earth orbit. This drag can cause an orbit to decay much faster than usual. A storm might cause an orbit change in just a few days. Normally, this change might take a year or more to happen. This makes it harder for satellites to stay in their correct positions.

Humans have been observing these phenomena for a very long time. For centuries, people saw the aurorae in the high latitudes. In 1724, George Graham noticed magnetic compass needles deflecting daily. In 1852, Edward Sabine proved sunspots correlate with geomagnetic storms. A massive solar storm in 1859 caused bright auroras and broke telegraphs. Richard Carrington later connected a solar flare to such a storm. In 1958, the Explorer I satellite discovered the Van Allen belts. These are regions where radiation particles are trapped by Earth's magnetic field.

Modern society relies heavily on systems that space weather can disrupt. Communications satellites and GPS systems are vital for global commerce. Space weather can cause scintillation in radio signals. This is a distortion of signals as they pass through the ionosphere. The ionosphere can bend radio waves much like water bends light. This can make GPS signals difficult for receivers to process. For example, the Wide Area Augmentation System used by the FAA is often disabled by major space weather events. These outages can last from a few minutes to several days.

Because of these risks, many organizations now monitor the sun. The US National Space Weather Program focuses on research for military and commercial needs. The International Civil Aviation Organization (ICAO) also has an advisory program. They use four global service providers to help keep travelers safe. These include the US, the ACFJ consortium, the PECASUS consortium, and the CRC consortium. These groups help protect aircraft, especially on polar routes. They also help protect astronauts from radiation hazards.