naturebriefs
8:22in productionCh. 1 · Where They Live/ 8:22 · ceiling 15 min
Systems

Sprite (lightning)

Sprites aren’t lightning—they’re the mesosphere’s cold, fast, unexplained reply to it.

Sprites are mesospheric cold plasma discharges triggered by positive cloud-to-ground lightning. They appear as clustered red-orange flashes with blue tendrils at 50–90 km altitude. First photographed on July 4, 1989, by University of Minnesota scientists. Their root cause remains unknown beyond that association. High-speed imaging revealed they consist of decameter-scale ionization balls launched near 80 km, moving downward at up to 10% light speed.

SystemsAstronomyPhysicsWeatherAstronomy across the network →
Chapters & takeaways4
  1. 0:50
    Where They Live

    Sprites live 50–90 km up—above weather, below space—and only appear in clusters.

  2. 2:28
    What Triggers Them

    They fire after positive cloud-to-ground lightning—but why remains unknown.

  3. 3:58
    How They Glow

    They glow red-orange with blue tendrils—but run cold, like fluorescent tubes, not lightning.

  4. 5:25
    How We Found Out

    First caught on film in 1989; high-speed cameras later revealed decameter-scale ionization balls moving at relativistic speeds.

Worth your time?

Yes. See the whole thing.

4.5/ 5
What works
  • signals intense positive cloud-to-ground lightning
  • reveals large-scale transient ionization dynamics
  • demonstrates cold plasma self-organisation at scale
What does not
  • produce heat
  • occur in the troposphere
  • follow predictable shape or timing
  • generate audible sound
See it if
  • atmospheric physicists
  • high-speed videographers
  • storm chasers with mesospheric observation capability
Skip it if
  • casual skywatchers
  • educators without lab-grade footage
  • anyone expecting repeatable naked-eye detail
The written brief1 min read

What the species is and where it came from

Sprites are transient luminous events: cold plasma discharges in the mesosphere, first photographed on July 4, 1989, by University of Minnesota scientists. They originate above cumulonimbus clouds, not within them.

How it works, in terms someone would actually use

Sprites are cold plasma discharges—not hot lightning—triggered by positive cloud-to-ground lightning. They ignite in the mesosphere, 50–90 km above thunderstorms, as red-orange flashes with blue tendrils. High-speed imaging shows they begin as decameter-scale ionization balls launched near 80 km, moving downward at up to 10% light speed.

What it gets right

They correctly signal intense positive cloud-to-ground lightning below. They reveal large-scale, transient ionization dynamics that standard radar and radio methods miss. They demonstrate cold plasma self-organisation at scale.

What it does not

Sprites do not behave like tropospheric lightning. They lack thermal channels. They do not produce thunder. They do not occur outside mesospheric altitudes. They do not follow predictable timing or morphology—even within a single cluster.

What it changed

They changed how physicists model energy transfer between troposphere and mesosphere. Their discovery forced a revision of assumptions about electrical coupling across atmospheric layers.

Who it is for, and who it is not

For atmospheric physicists, high-speed videographers, and storm chasers with mesospheric observation capability. Not for casual skywatchers, educators without lab-grade footage, or anyone expecting repeatable naked-eye detail.

Is it worth your time

Yes—if you’re tracking atmospheric electricity or filming nocturnal mesospheric phenomena from high ground during active thunderstorms. No—if you expect visible structure without high-speed cameras or low-light video gear.

Same habitat · Systems4 of 64
8:09
Antelope CanyonAntelope Canyon is a slot canyon on Navajo land in the American Southwest, formed by flash flood erosion of Navajo Sandstone. Monsoon rainwater carries sand into narrow passageways, deepening corridors and smoothing edges into flowing shapes. A flash flood on August 12, 1997 killed eleven tourists in Lower Antelope Canyon — triggered by an upstream thunderstorm 7 miles away. That event replaced amateur wood ladders with bolted systems and cargo nets. Today, a NOAA Weather Radio and alarm horn stand at the fee booth to warn of incoming floods. The canyon remains dangerous, managed, and visually singular.
9:40
AposematismAposematism is a functional, empirically tested strategy — not metaphor, not speculation. It is defined by honesty, observability, and consequence.
9:16
Army antArmy ants are a functional category—not a taxon—defined by nomadism, mass raiding, and monogynous, wingless queens. Genetic evidence from 2003 shows some lineages share deep ancestry; others converged. Their raids drive ecosystem dynamics across tropical forests. They offer no compromise: no stillness, no shared queens, no permanent home.
9:39
Blue holeBlue holes are marine sinkholes in carbonate bedrock, formed during ice ages when lower sea levels exposed limestone to rain and chemical weathering. They contain tidally influenced but poorly circulated water — fresh, marine or mixed — with sharp haloclines and anoxic deep zones that host bacteria but exclude most marine life. Their high transparency and white carbonate sand produce the signature deep blue colour. They differ from cenotes by holding seawater, not freshwater. They serve as sediment traps preserving climate and fossil records.
Up next in Nature

Common Surinam toad

· 8:07

The only tetrapod that inflates its whole trunk to eat—and incubates froglets in its own skin.

Play nextBack to Systems
8:07