Light Streaks: Definitions, Types, and Physical Causes

What Is a "Streak of Light"?

A luminous streak can refer to several distinct phenomena:

Atmospheric/Optical

• Lightning flash: Atmospheric electrical discharge; jagged, branched, milliseconds duration.
• Meteor trail (shooting star): Meteoroid ablation in upper atmosphere; brief, linear, often colored.
• Sunbeam (crepuscular ray): Sunlight scattered by particles through cloud gaps; visible shafts.

Optical/Imaging Artifacts

• Lens flare: Internal reflections/scattering in lens elements; bright spots, rings, streaks.
• Light leak: Camera body/lens seal failure; fogging, streaks, usually red/orange (film) or white (digital).
• Rolling shutter artifact: Fast-moving light sources (e.g., car headlights) distort in CMOS sensors.

Physics/Particle

• Streak (particle physics): Localized track of ionizing particles in detectors (cloud chamber, emulsion).
• Cherenkov radiation: Blue glow/streak from particles exceeding light speed in a medium.

Biological/Perceptual

• Entoptic phenomena: Floaters, blue field entoptic phenomenon (white blood cells in retinal capillaries).
• Migraine aura: Scintillating scotoma – zigzag streaks expanding over 20–30 minutes.

Context determines meaning: photography, astronomy, physics, or visual symptoms.