The Kp Index measures global geomagnetic activity (0-9). Higher = stronger aurora.

• 0-2: Quiet - High latitudes only
• 3-4: Unsettled - Northern US/Canada
• 5-6: Storm - Mid-latitudes
• 7+: Severe - Widespread

Bz is the magnetic field direction. South (negative) = aurora favorable!

• South (-): ✅ Particles enter atmosphere
• North (+): ⛔ Blocked by Earth's field

Hemispheric Power = total energy into the aurora (GW).

• <20: Quiet
• 20-50: Minor
• 50-100: Moderate - good!
• >100: Strong - excellent!

Solar Wind Speed = how fast particles travel to Earth.

• <400: Slow
• 400-500: Moderate
• 500-700: Fast - enhanced
• >700: Very fast!

Density = particle concentration. Higher = brighter colors!

• <3: Low - weaker
• 3-10: Normal
• 10-20: Enhanced
• >20: High - very colorful!

Clear skies are essential for aurora viewing. You need to see the sky!

• 0-20%: Clear - excellent!
• 20-50%: Partly cloudy - fair
• 50-80%: Mostly cloudy - poor
• >80%: Overcast - unlikely