Space Weather
Summary
Space weather is the collective term for time-variable phenomena in the near-Earth space environment driven by the Sun, including solar wind, coronal mass ejections (CMEs), solar energetic particle events, and their downstream effects on the geomagnetic field, ionosphere, and ground-level EM environment. Space-weather forecasting and characterisation are operational concerns of NOAA, ESA, and other national space-weather services.
Drivers
- Solar wind: continuous outflow of plasma (~ 400 km/s, varying with solar conditions) from the Sun.
- Coronal mass ejections (CMEs): massive plasma / magnetic-field eruptions, typically requiring 1-4 days to reach Earth, capable of producing major geomagnetic storms.
- Solar flares: rapid electromagnetic emission events, reaching Earth in 8 minutes and immediately affecting the dayside ionosphere.
- Solar energetic particles (SEPs): high-energy protons / heavy ions accelerated by flares and CME shocks, reaching Earth in minutes to hours, affecting satellites and polar ionosphere.
- Coronal hole high-speed streams: lower-density, high-velocity (~ 600-800 km/s) wind from coronal magnetic-field "open" regions; produce recurring geomagnetic storms.
Effects
- Geomagnetic storms (measured by Kp and Dst): depression of the surface geomagnetic field, ring-current intensification.
- Ionospheric storms: ionisation enhancement / depletion, disruption of HF radio propagation.
- Auroras: enhanced and equatorward-displaced during major storms.
- Satellite anomalies: single-event upsets, solar-panel degradation, increased atmospheric drag on LEO satellites.
- Power-grid risk: geomagnetically-induced currents (GICs) in long transmission lines; the 1989 Quebec storm caused a 9-hour outage.
- Communications and navigation: HF radio outages, GPS positioning errors during storms.
Major Historical Events
- 1859 Carrington event: the largest known geomagnetic storm in the instrumental era, observed by Richard Carrington. Telegraph systems failed worldwide; auroras seen near the equator. Modern equivalent estimated at $1-2 trillion in economic damage.
- 1989 Quebec storm (Dst ≈ -589 nT): collapsed the Hydro-Québec grid; 6 million people without power for 9 hours.
- 2003 Halloween storms (Dst ≈ -422 nT): widespread satellite anomalies; auroras visible to mid-latitudes.
Operational Monitoring
The principal monitoring infrastructure:
- SOHO, ACE, DSCOVR spacecraft at the L1 Lagrange point — provide ~ 30-60 minute solar-wind warning.
- GOES, SDO geostationary satellites — solar X-ray and EUV monitoring.
- Worldwide magnetometer network — Kp / Dst calculation.
- Ionospheric sounding networks — real-time ionosphere state.
NOAA's Space Weather Prediction Center (swpc.noaa.gov) is the principal US operational source.
Psionic Relevance
In the psionic framework, space-weather variables are the principal external modulators of the Earth's EM environment. The framework predicts measurable correlations between space-weather indices and ψ-field-mediated biological / consciousness phenomena. The empirical literature (Persinger et al., GCP, multiple epidemiological studies) supports this prediction at small effect sizes.
See Also
- Geomagnetic_Field
- Geomagnetic_Indices_Kp_Dst
- Solar_Cycles
- Earth-Ionosphere_Cavity
- Schumann_Resonance
External Links
- Wikipedia: Space weather
- NOAA Space Weather Prediction Center.
- ESA Space Weather Office.
References
- Schwenn, R. (2006). "Space weather: the solar perspective." Living Reviews in Solar Physics 3: 2.
- Pulkkinen, T. (2007). "Space weather: terrestrial perspective." Living Reviews in Solar Physics 4: 1.
