Trystan Casey
Lightning is a natural phenomenon that occurs when there is a rapid discharge of electricity in the atmosphere between clouds, air, or the ground. This occurs due to the build-up of opposite charges, which, when they become strong enough, break down the insulating capacity of the air, resulting in a lightning strike. Lightning discharges generate radio-frequency electromagnetic waves, which can be detected thousands of kilometres away. The global frequency of lightning is approximately 44 (± 5) times per second, resulting in nearly 1.4 billion flashes per year.
| Characteristics | Values |
|---|---|
| Definition | A giant spark of electricity in the atmosphere between clouds, the air, or the ground |
| Process | A bidirectional channel of ionized air, called a "leader", is initiated between oppositely-charged regions in a thundercloud |
| Frequency | 44 (± 5) times per second, or nearly 1.4 billion flashes per year |
| Energy released | Between 200 megajoules and 7 gigajoules |
| Temperature | About 30,000 °C (54,000 °F) |
| Electromagnetic radiation | Wide range, including radio-frequency pulses |
| Peak current | 75kA-100kA, with some sources citing 200kA for naturally occurring lightning |
| Voltage rise time | 8-10 uS |
| Voltage decay time | 20-350 uS |
| Duration | 30 µs |
| Sound | Thunder, caused by a shock wave and the sudden increase in pressure of heated gases |
| Origin | Within clouds, or between clouds and the ground |
| Charge regions | Caused by graupel (small hail particles) and ice particles with opposite electrical charges |
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What You'll Learn
Lightning is a natural phenomenon
The creation of lightning begins with the development of electrical charge regions in thunderstorms. Scientists believe that this process involves small hail particles called graupel, which collect supercooled liquid droplets. When these graupel particles collide with smaller ice particles, they gain opposite charges. As the smaller ice particles rise faster in updrafts, the charges separate, with the positive charge accumulating in the upper part of the storm and the negative charge in the middle. This separation of charges creates a potential difference, leading to the buildup of electrical tension.
As the tension intensifies, the insulating capacity of the air breaks down, and lightning occurs. This rapid discharge of electricity temporarily equalizes the charged regions until opposite charges build up again. The lightning discharge generates electromagnetic radiation, including radio-frequency pulses, which can be detected thousands of kilometres away. The electromagnetic pulses propagate within the Earth-ionosphere waveguide, allowing for the detection and location of lightning strikes from a significant distance.
Lightning is a powerful force of nature, releasing energy on a scale averaging between 200 megajoules and 7 gigajoules. The air around the lightning flash can reach extremely high temperatures of about 30,000 °C (54,000 °F). The frequency of lightning on Earth is approximately 44 (± 5) times per second, resulting in nearly 1.4 billion flashes per year. This natural phenomenon continues to be a subject of scientific inquiry, with ongoing debates about the exact mechanisms of lightning formation and the behaviour of charged regions within thunderstorms.
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It's a giant spark of electricity
Lightning is a giant spark of electricity in the atmosphere between clouds, the air, or the ground. In the early stages of development, air acts as an insulator between the positive and negative charges in the cloud and between the cloud and the ground. When the opposite charges build up enough, the insulating capacity of the air breaks down and there is a rapid discharge of electricity that we know as lightning. This discharge creates a flash of lightning that temporarily equalizes the charged regions in the atmosphere until the opposite charges build up again.
Lightning is an electrostatic discharge accompanied by the emission of light and other forms of electromagnetic radiation, such as radio-frequency electromagnetic waves. It can have 100 million to 1 billion volts and contains billions of watts. The air around the lightning flash rapidly heats up to temperatures of about 30,000 °C (54,000 °F or 50,000 °F according to another source), causing the surrounding gases to suddenly increase in pressure, resulting in the sound of thunder.
The process of lightning formation involves the oxidation and/or reduction of chemical species. It is believed that the two largest charge regions in most storms are caused by graupel carrying a negative charge in the middle of the storm and ice particles carrying a positive charge in the upper part. As a thunderstorm cloud grows, precipitation forms within it, and the electrical charge distribution inside the cloud becomes more distinct.
Lightning can occur between opposite charges within a thunderstorm cloud (intra-cloud lightning), between clouds (cloud-to-cloud lightning), or between the cloud and the ground (cloud-to-ground lightning). Most lightning flashes produced by storms start inside the cloud, and if they are going to strike the ground, a channel develops downward. When it gets close to the ground, objects like trees and buildings may send up sparks to meet it. When one of these sparks connects with the downward-developing channel, a huge electric current surges rapidly down the channel to the object that produced the spark.
Lightning plays a crucial role in maintaining the Earth's electrical balance. Thunderstorms and electrified clouds create a negative charge on the Earth and a positive charge in the atmosphere, maintaining the fair-weather electric field. Without thunderstorms and lightning, the Earth-atmosphere electrical balance would be lost within minutes.
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It occurs at an average frequency of 44 times per second
Lightning is a natural phenomenon consisting of electrostatic discharges between two electrically charged regions. These discharges generate radio-frequency electromagnetic waves, which can be detected thousands of kilometres away from their source. The Earth-ionosphere waveguide traps electromagnetic VLF and ELF waves, and the electromagnetic pulses transmitted by lightning strikes propagate within this waveguide.
Lightning occurs at an average frequency of 44 times per second, or approximately 1.4 billion flashes per year. This frequency is likely due to the rapid process of charge accumulation and discharge. In a thunderstorm, small hail particles called graupel collect smaller supercooled liquid droplets. When these graupel particles collide with ice particles, they become charged. As the smaller ice particles rise faster in updrafts, the charge separates, creating positively and negatively charged regions. When the opposite charges build up sufficiently, the insulating capacity of the air breaks down, resulting in a lightning strike.
The rapid release of energy in a lightning strike produces a bright flash and a loud thunderclap. The air around the lightning flash heats up to an astonishing 30,000 °C (54,000 °F), causing the surrounding gases to rapidly increase in pressure, resulting in the shock wave we perceive as thunder.
The high-frequency nature of lightning is further evidenced by its ability to induce currents in conductive elements such as power lines and metallic pipes. These induced currents can lead to the destruction of delicate electronics and electrical appliances. To protect against such damage, devices like surge protectors (SPDs) or transient voltage surge suppressors (TVSS) are used. These devices detect the lightning flash's irregular current and redirect the spike to an attached earthing ground, safeguarding the equipment.
Overall, the average frequency of lightning at 44 times per second underscores the rapid and powerful nature of this natural phenomenon, requiring specialized equipment to mitigate its potential impact on our technological infrastructure.
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It's a complicated process
Lightning is a natural phenomenon consisting of electrostatic discharges of electricity in the atmosphere between clouds, the air, or the ground. These discharges occur between two electrically charged regions, with one or both regions in the atmosphere and the second sometimes on the ground. The charged regions are temporarily electrically neutralized following the lightning strike, until the opposite charges build up again.
The process of how lightning forms is not yet fully understood by scientists. It is thought that the initial process of creating charge regions in thunderstorms involves small hail particles called graupel, which are around one-quarter millimeter to a few millimeters in diameter. When these graupel particles collide with smaller ice particles, they gain opposite charges. As the smaller ice particles rise faster in updrafts, the charges separate, with the positive charge collecting in the upper part of the storm and the negative charge in the middle.
The lightning strike itself is a rapid discharge of electricity. The air around the lightning flash rapidly heats up to temperatures of about 30,000 °C (54,000 °F), causing the emission of electromagnetic radiation across a wide range of wavelengths, some of which are visible as a bright flash. Lightning also produces radio-frequency electromagnetic waves and X-rays, which can be detected thousands of kilometers away.
The most well-studied form of lightning is cloud-to-ground (CG) lightning, but intra-cloud (IC) and cloud-to-cloud (CC) lightning are more common and more challenging to study due to the lack of physical points to monitor inside the clouds. Positive lightning strokes (ground to cloud) are typically more intense than cloud-to-ground or cloud-to-cloud strikes, with discharges exceeding 100kA.
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It involves the release of electromagnetic radiation
Lightning is a natural phenomenon that involves the rapid movement of electricity between two electrically charged regions. It is a giant spark of electricity in the atmosphere between clouds, the air, or the ground. This movement of electricity results in the release of electromagnetic radiation, including radio-frequency pulses.
The process of creating lightning begins with the development of electrical charges within a cloud. This occurs through the collision of small hail particles called graupel with supercooled liquid droplets. The graupel gains a negative charge, while the smaller ice particles gain a positive charge. As the ice particles rise faster in updrafts, the charges separate, creating positively and negatively charged regions within the cloud.
When the opposite charges build up enough, the insulating capacity of the air breaks down, and there is a rapid discharge of electricity known as lightning. This discharge creates a bidirectional channel of ionized air called a "leader", which facilitates the movement of electricity between the charged regions. The lightning temporarily equalizes the charged regions until the opposite charges build up again.
The release of electromagnetic radiation during lightning is in the form of electromagnetic waves and pulses. These radiations have a wide spectral density and can be received thousands of kilometres from their source. The electromagnetic waves propagate within the Earth-ionosphere waveguide, which is dispersive, meaning their group velocity depends on frequency. This property allows for the localisation of lightning strikes using direction-finding methods.
The electromagnetic radiation released by lightning can also be observed in the form of visible light and sound. The bright flash of lightning is a result of the emission of electromagnetic radiation across a wide range of wavelengths. Additionally, lightning causes thunder, which is the sound created by the shock wave that develops as heated gases in the vicinity of the discharge experience a sudden increase in pressure.
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Frequently asked questions
Lightning discharges generate radio-frequency electromagnetic waves, which can be received thousands of kilometres away from their source. Lightning is referred to as a high-frequency source, with an average lightning duration of 30 microseconds and a spectrum of around 33 kHz.
Lightning is a natural phenomenon consisting of electrostatic discharges occurring through the atmosphere between two electrically charged regions. One or both regions are within the atmosphere, with the second region sometimes being on the ground. Lightning involves a near-instantaneous release of energy on a scale averaging between 200 megajoules and 7 gigajoules.
Global monitoring indicates that lightning occurs at an average frequency of approximately 44 (± 5) times per second, equating to nearly 1.4 billion flashes per year.
