Aurora Borealis in Žďár nad Sázavou, Czechia Tonight
Aurora Borealis predictions for Žďár nad Sázavou tonight — updated every 6 hours
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30-Night Aurora Outlook for Žďár nad Sázavou
First 7 nights from data, remaining nights available in the app
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Aurora Borealis in Žďár nad Sázavou — What You Need to Know
Aurora Borealis & the Auroral Oval in Žďár nad Sázavou
Žďár nad Sázavou is located at 49.6°N, 15.9°E (geographic) and 48.9° magnetic latitude. This places it far from the auroral oval. The northern lights (aurora borealis) are only visible during extreme geomagnetic storms (Kp 9), requiring a minimum Kp index of 9.
In Žďár nad Sázavou, geographic and magnetic latitudes are close (49.6° vs 48.9°), so standard latitude gives a reasonable indication of aurora chances.
What is the Kp index?
The Kp index is a 0–9 scale that measures global geomagnetic disturbance. Higher Kp values push the auroral oval further from the poles — at Kp 3, aurora is common above 65° magnetic latitude; at Kp 7+, it can reach below 50°. A Kp of 9 means a G5 extreme storm — the most powerful category. These are rare (a few per solar cycle) but when they hit, aurora can be visible at surprisingly low latitudes.
Aurora Borealis Viewing Conditions in Žďár nad Sázavou
Even when the Kp index is high enough for Žďár nad Sázavou, several factors determine whether you'll actually see the aurora:
- Cloud cover — the single biggest obstacle. You need clear or mostly clear skies.
- Darkness — aurora is only visible when the sun is at least 6° below the horizon (civil twilight or darker).
- Moonlight — a bright moon (especially full) washes out fainter aurora displays. New moon nights are ideal.
- Light pollution — urban skyglow reduces contrast (Falchi et al. 2016). Getting even 15–20 km outside the city center makes a noticeable difference.
Best Time to See Aurora Borealis in Žďár nad Sázavou
Aurora sightings in Žďár nad Sázavou are rare and typically require a major geomagnetic storm (Kp 9+). When they happen, the best chances are during dark winter nights between October and February, away from city lights. During solar maximum (like 2024–2025), these storms occur more frequently, increasing the odds.
Frequently Asked Questions — Aurora Borealis in Žďár nad Sázavou
Can I see aurora borealis in Žďár nad Sázavou tonight?
It depends on the current Kp index. Žďár nad Sázavou needs a Kp of 9 or higher for aurora borealis to be visible. Check the live forecast above for tonight's prediction, or download the Revon app for real-time alerts.
What Kp index is needed for northern lights in Žďár nad Sázavou?
Žďár nad Sázavou is at 48.9° magnetic latitude and requires a minimum Kp index of 9 for aurora to be visible. The Kp index is a 0-9 scale measuring geomagnetic activity — higher values push the auroral oval further from the poles.
When is the best time to see aurora borealis in Žďár nad Sázavou?
The best time to see aurora borealis in Žďár nad Sázavou is October through February, during major geomagnetic storms, when nights are long and dark enough for observation. Within those months, the hours between 10 PM and 2 AM local time typically offer the best chances.
How does the aurora borealis forecast work?
The forecast combines NOAA solar wind and Kp index data with a machine learning model to predict aurora probability for each location. It updates every 6 hours on the website and every 15 minutes in the Revon app, which also factors in cloud cover, darkness, moonlight, and light pollution.