Lightning And Electricity: Understanding Sky Electricity Flows

The Earth's atmosphere is a complex electrical system, with charges moving between the Earth's surface, the atmosphere, and the ionosphere. This movement of charges, known as atmospheric electricity, has been a subject of curiosity for centuries, with early scientists recognizing the similarities between electrical sparks and lightning. Today, we understand that thunderstorms act as giant batteries, charging the atmosphere to hundreds of thousands of volts. This electrical energy can be harnessed through the development of new technologies, such as a device that captures energy from the cold night sky, offering a potential renewable energy source for remote areas.

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Lightning and thunderstorms

A bolt of lightning can reach temperatures of up to 50,000 degrees Fahrenheit, which is five times hotter than the surface of the sun. This rapid heating and cooling of the air near the lightning cause the sound of thunder. Lightning bolts can strike up to 10 miles away from their parent cloud, even in areas with blue skies. This phenomenon is called a "Bolt from the Blue".

Thunderstorms are formed from a combination of moisture, rapidly rising warm air, and a force capable of lifting the air, such as a warm or cold front, a sea breeze, or a mountain. All thunderstorms contain lightning and can produce intense winds, flash floods, hail, and dangerous lightning strikes. The energy released by an average thunderstorm is equivalent to about 10,000,000 kilowatt-hours, which is comparable to a 20-kiloton nuclear warhead. Severe thunderstorms can be 10 to 100 times more energetic.

Lightning is an electrical discharge resulting from the buildup of positive and negative charges within a thunderstorm. When this buildup becomes strong enough, it appears as a lightning bolt. These bolts of lightning usually occur within the clouds or between the clouds and the ground.

To stay safe during a thunderstorm, it is important to pay attention to weather reports and warnings. When you hear thunder, it is recommended to go inside a sturdy building or an enclosed metal vehicle immediately. If you are indoors, avoid using electronic devices, running water, or landline phones, as electricity can travel through plumbing and phone lines. It is also advised to unplug appliances and other electronic devices.

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Ionisation and conductivity

The Earth's atmosphere is constantly bombarded by radiation from outer space, primarily consisting of positively charged ions. This radiation interacts with atoms in the atmosphere, creating an air shower of secondary ionising radiation, including X-rays, muons, protons, alpha particles, pions, and electrons. This ionisation ensures that the atmosphere is weakly conductive, with a slight current flow from these ions over the Earth's surface.

The movement of charge between the Earth's surface, the atmosphere, and the ionosphere is known as the global atmospheric electrical circuit. The ionosphere, located between 80 and 500 km above the Earth's surface, is a region of the atmosphere that is partially ionised and contains a plasma. This plasma is created when high-energy particles from solar radiation, such as ultraviolet (UV), X-ray, and shorter wavelengths, interact with neutral gas atoms or molecules in the atmosphere, dislodging electrons and creating a mix of positively charged ions and free electrons.

The ionosphere's conductivity refers to its ability to conduct electricity due to collisions between these charged particles and neutral gases. This conductivity is influenced by various factors, including solar radiation, lunar tidal motions, and particle precipitation. During the daytime, ionising solar radiation increases ionospheric conductivity, leading to the formation of electric currents that flow in opposite directions in the Northern and Southern Hemispheres.

Additionally, geomagnetic storms and ionospheric storms can cause dramatic changes in the ionospheric currents. These storms are temporary disturbances of the Earth's magnetosphere and ionosphere, leading to the fragmentation or disappearance of certain layers within the ionosphere. The bright auroras observed during these storms are a result of enhanced ionospheric conductance due to strong particle precipitation.

Furthermore, pulsating auroras have been linked to low-altitude ionisation in the ionosphere, as observed during a CIR-driven storm event in the Scandinavian sector. This ionisation is believed to be caused by incident energetic electron precipitation, leading to the creation of a secondary Pedersen conductivity layer around 80 km in addition to the primary layer at 120 km.

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Electrostatic forces

The movement of charge between the Earth's surface, the atmosphere, and the ionosphere is known as the global atmospheric electrical circuit. Atmospheric electricity is highly variable, but the electric field is enhanced in fogs and dust, whereas atmospheric electrical conductivity is diminished. The atmospheric potential gradient leads to an ion flow from the positively charged atmosphere to the negatively charged Earth's surface.

Thunderstorms act as a giant battery in the atmosphere, charging up the electrosphere to about 400,000 volts with respect to the surface. This sets up an electric field throughout the atmosphere, which decreases with an increase in altitude. The main charging area in a thunderstorm occurs in the central part of the storm, where air moves upward rapidly (updraft) and temperatures are low. The updraft carries positively charged ice crystals upward toward the top of the storm cloud. The larger and denser graupel (soft hail) is either suspended in the middle of the thunderstorm cloud or falls toward the lower part of the storm. The result is that the upper part of the thunderstorm cloud becomes positively charged, while the middle to the lower part becomes negatively charged.

The upward motions within the storm and winds at higher levels in the atmosphere cause the small ice crystals (and positive charge) in the upper part of the thunderstorm cloud to spread out horizontally some distance from the thunderstorm cloud base. This part of the thunderstorm cloud is called the anvil. While this is the main charging process for the thunderstorm cloud, some of these charges can be redistributed by air movements within the storm (updrafts and downdrafts). There is also a small but important positive charge buildup near the bottom of the thunderstorm cloud due to the precipitation and warmer temperatures.

The charges on the ground are influenced by the charge buildup in the clouds. Normally, the ground has a slight negative charge. However, when a thunderstorm is directly overhead, the large negative charge in the middle of the storm cloud repels negative charges on the ground underneath the storm. This causes the ground and any objects (or people) on the ground directly underneath the storm to become positively charged. As the negative charge in the cloud increases, the ground responds by becoming more positively charged.

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 occurring on the ground. Following the lightning, the regions become partially or wholly electrically neutralized. Lightning involves a near-instantaneous release of energy, and the air around the lightning flash rapidly heats up to temperatures of about 30,000 °C (54,000 °F). There is an emission of electromagnetic radiation across a wide range of wavelengths, some visible as a bright flash. Lightning also causes thunder, a sound from the shock wave that develops as heated gases in the vicinity of the discharge experience a rapid increase in pressure.

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Energy harvesting from the sky

One method of energy harvesting from the sky is through the use of falling raindrops. Scientists have developed a system that recovers the vibration energy from a piezoelectric structure impacted by a raindrop. The system uses a PVDF (polyvinylidene fluoride) polymer, a piezoelectric material that converts the mechanical energy of the raindrop into electrical energy. The amount of energy generated per drop varies between 2 µJ and 1 mJ, depending on its size.

Another method of energy harvesting from the sky is by harnessing the coldness of space. This technique utilizes the same optoelectronic physics as solar panels but instead focuses on the outgoing radiation as heat escapes from Earth into space. In an experiment, researchers were able to produce 64 nanowatts per square meter of power. While this is a small amount, the researchers believe that with the right materials and conditions, it could be increased to 4 watts per square meter.

Additionally, thunderstorms play a crucial role in atmospheric electricity by acting as a giant battery. They charge up the electrosphere to about 400,000 volts with respect to the Earth's surface, creating an electric field throughout the atmosphere. This electric field enhances atmospheric electricity, even in the absence of thunderstorms. The potential difference between the ionosphere and the Earth is maintained by lightning strikes, which deliver negative charges from the atmosphere to the ground.

Overall, energy harvesting from the sky offers a range of innovative ways to capture and utilize the energy present in our atmosphere and beyond. From raindrops to the coldness of space, these techniques contribute to our understanding of atmospheric electricity and provide alternative sources of renewable energy.

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Electric fields and circuits

The movement of charge between the Earth's surface, its atmosphere, and the ionosphere is known as the global atmospheric electrical circuit. Atmospheric electricity is a complex interdisciplinary topic involving concepts from electrostatics, atmospheric physics, meteorology, and Earth science.

The Earth and almost all living things on it are constantly bombarded by radiation from outer space. This radiation primarily consists of positively charged ions from protons to iron and larger nuclei derived from sources outside the Solar System. This radiation interacts with atoms in the atmosphere to create secondary ionizing radiation, including X-rays, muons, protons, alpha particles, pions, and electrons. This ionization ensures that the atmosphere is weakly conductive, and the slight current flow from these ions over the Earth's surface balances the current flow from thunderstorms.

The Earth's atmosphere contains charges that can be acted on by an electric field. These charges move through the atmosphere in the form of an electric current, which is used to push power through wires. The electric grid is a vast network designed to move tremendous amounts of energy around the world. Power plants, whether solar, wind, coal, or nuclear, all contribute energy to the grid, which distributes it to consumers.

Electric circuits are a fundamental concept in understanding electricity. In schools, circuit boards are often used to introduce students to electric circuits. These boards are designed with simple components so that the constructed circuit resembles a circuit diagram. This helps students visualize the circuit and draw their diagrams. However, circuit boards can sometimes confuse less advanced students when parts of the board without connections are not recognized as being outside the circuit. Separate components connected by wires offer a cheaper alternative but can result in a tangled mess of wires.

Electric current is known for its heating, magnetic, and chemical effects. When two different materials come into contact and then separate, electrons may be transferred, resulting in one material gaining a positive charge and the other gaining a negative charge. This is known as the triboelectric series. In electric circuits, an electric field, along with an electromotive force (EMF) provided by an external source, causes electrons to move in the direction of lower potential. The EMF then "pushes" the electrons back to their original potential.

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