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A knowledge platform for everything above Earth — astronomy, space, the night sky, celestial events, mythology, and astrology as a clearly separate cultural tradition.

Astronomy is presented as scientific, evidence-based, and sourced. Astrology is presented as cultural, symbolic, and interpretive — never as proven science.

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Home
Space Environment
NOAA R-Scale (Radio Blackouts)

Geomagnetic index · R1–R5

NOAA R-Scale (Radio Blackouts)

NOAA's five-level scale for radio blackouts caused by solar-flare X-rays ionising the dayside upper atmosphere, from R1 (minor) to R5 (extreme).

Environment & effects

Related:Solar Flare

Knowledge connections

Associated withSolar Flare
Associated withSolar Flare
Associated withThe Ionosphere
Associated withGPS & Navigation
Associated withAviation
Associated withRadio Communications

Sources

Facts on this topic will be cited from these primary and reference sources.

NOAA Solar CalculatorNOAA Global Monitoring Laboratory
Public-domain solar-position geometry: sunrise, sunset, solar noon, twilight, declination, and the equation of time.
Public domain (US Government work).

Quick facts

Scale: R1–R5

Space weather now

This encyclopedia states no live conditions or forecasts. For current space weather, NOAA's Space Weather Prediction Center is the authoritative operational source.

Quality & authority

31%

Unreviewed

Completeness: Complete
Source coverage: Partial
Citation coverage: None
Relationship coverage: Complete
Review coverage: None
Image coverage: None

Curated from NASA and NOAA. Unknown values are left blank. See source quality.