Electrical phenomena

thumb|upright=1.5|Strokes of cloud-to-ground lightning strike the Mediterranean Sea off of Port-la-Nouvelle in southern France.

An aurora ( aurorae or auroras) is a natural light display in Earth’s upper atmosphere caused by charged particles from the Sun colliding with atoms in the atmosphere. These collisions excite oxygen and nitrogen, which then emit light of different colors such as green, red, and purple. When observed in high-latitude regions they are called polar lights and aurora polaris. In the Arctic they are called northern lights (aurora borealis); in the Antarctic, the terms southern lights (aurora australis) are used. Auroras display dynamic patterns of radiant light that appear as curtains, rays, spiral

emission of electrons when light hits a material

weather phenomenon

thumb|upright=1.1|Piezoelectric balance presented by Pierre Curie to [[Lord Kelvin, Hunterian Museum, Glasgow]]

thumbnail|Views of a liquid crystal display, both with electroluminescent backlight switched on (top) and switched off (bottom) Electroluminescence (EL) is an optical and electrical phenomenon, in which a material emits light in response to the passage of an electric current or to a strong electric field. This is distinct from black body light emission resulting from heat (incandescence), illumination by light (photoluminescence), chemical reactions (chemiluminescence), reactions in a liquid (electrochemiluminescence), sound (sonoluminescence), or other mechanical action (mechanoluminescence),

type of contact electrification

Aeronomy is the scientific study of the upper atmosphere of the Earth and corresponding regions of the atmospheres of other planets. It is a branch of both atmospheric chemistry and atmospheric physics. Scientists specializing in aeronomy, known as aeronomers, study the motions and chemical composition and properties of the Earth's upper atmosphere and regions of the atmospheres of other planets that correspond to it, as well as the interaction between upper atmospheres and the space environment. In atmospheric regions aeronomers study, chemical dissociation and ionization are important phenom

large-scale electrical discharge that occurs high above thunderstorm clouds

thumb|Internals of a pyroelectric sensor Pyroelectricity (from Greek: pyr (πυρ), "fire" and electricity) is a property of certain crystals which are naturally electrically polarized and as a result contain large electric fields. Pyroelectricity can be described as the ability of certain materials to generate a temporary voltage when they are heated or cooled. The change in temperature modifies the positions of the atoms slightly within the crystal structure, so that the polarization of the material changes. This polarization change gives rise to a voltage across the crystal. If the temperature

photographic technique used to capture electrical coronal discharges

In physics and materials science, ferroelectricity is the property of certain materials that exhibit a spontaneous electric polarization—an internal electric alignment that arises naturally without an external source. This polarization can be reversed when an external electric field is applied.

electric current generation from light

electricity in planetary atmospheres

An electret (formed as a portmanteau of electr- from "electricity" and -et from "magnet") is a dielectric material that has a quasi-permanent electrical polarisation. An electret has internal and external electric fields, and is the electrostatic equivalent of a permanent magnet.

In electronics, crosstalk (XT) is a phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel. Crosstalk is usually caused by undesired capacitive, inductive, or conductive coupling from one circuit or channel to another.

Photoconductivity is an optical and electrical phenomenon in which a material becomes more electrically conductive due to the absorption of electromagnetic radiation such as visible light, ultraviolet light, infrared light, or gamma radiation.

lightning produced by a volcanic eruption

lightning not accompanied by thunder sound

Increase in voltage at a long AC power line

short-lived electrical phenomena that occur at high altitudes over lightning storms (sprites, jets, etc.)

flow of electric charge through a gas, liquid or solid

physical phenomenon

thumb|A STEVE over Little Bow Resort, [[Alberta, in August 2015]] thumb|A STEVE over Crossfield, Alberta, in March 2018 (around 12:30 a.m.)

electric or electromagnetic acoustic phenomenon

Predicted physical phenomenon in QED

In electromagnetics and materials science, antiferroelectricity is a physical property of certain materials. It is closely related to ferroelectricity; the relation between antiferroelectricity and ferroelectricity is analogous to the relation between antiferromagnetism and ferromagnetism.

electromagnetic wave propagating through the atmosphere that may be detected by a sensitive audio amplifier as a gliding high-to-low-frequency sound; originates during lightning discharges and are usually in the frequency range of 300 to 30,000 hertz

broadband electromagnetic impulse

type of loudspeaker

display made with electroluminescent material

physical phenomenon involving electricity

electrical discharge between two electrodes separated by an insulating dielectric barrier

the gate voltage appearing less than ground during transistor switching

electromechanical phenomenon

phenomenon in physics