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Solar cycle

Northern lights in France in 2026: why this year is exceptional

Published 28 April 2026 · 6 min read · Pulsar team

Solar cycle 25, of which the historic May 2024 storm was just a preview, peaks between late 2025 and late 2026. Statistically, this is the most favourable window in twenty years to see the northern lights from France. Here's what to know to make the most of it.

What is a solar cycle?

Solar activity follows a remarkably regular ~11-year rhythm. The Sun swings between very quiet minima (few sunspots, few coronal mass ejections) and busy maxima (many active regions, frequent magnetic storms). The more active the Sun, the higher the chance an eruption sends a plasma cloud at Earth, triggers a geomagnetic storm, and pushes the aurora down to lower latitudes.

Cycle 25, which started in December 2019, surprised every model. NASA and NOAA initially predicted a modest cycle, similar to the weak cycle 24. In reality, cycle 25 has been more active - to the point that May 2024 broke records 20 years old.

Why 2026 is exceptional

Three factors converge in 2026:

  • The solar maximum: NOAA estimates the cycle 25 peak between October 2024 and October 2026. The monthly mean sunspot number tops 150 - twice the minimum.
  • Post-peak inertia: statistically, the most violent storms often arrive 1 to 2 years after the declared maximum. The descending phase (2026-2028) typically generates more G4-G5 events than the ascending one.
  • Complex active regions: the Sun is entering a period where sunspot groups grow more complex (β-γ-δ magnetic class), correlated with major X-class flares.
If you needed a good reason to start watching the sky, this is it. The 2025-2027 window could deliver 2 to 4 events in the league of May 2024.

How many auroras to expect from France in 2026?

Past cycles set the order of magnitude. On average, during the active phase of a solar cycle, you can expect:

  • 10 to 15 events with Kp ≥ 5 per year: aurora visible from the northern half of France (Lille, Amiens, Calais, Strasbourg).
  • 3 to 5 events with Kp ≥ 7 per year: aurora visible from Paris, Nantes, Lyon, Bordeaux under decent conditions.
  • 0 to 2 events with Kp ≥ 8-9 per cycle: aurora visible as far south as Marseille, Toulouse, Nice.

With cycle 25 more active than predicted, the upper end of these ranges is the realistic target for 2026. Our per-city forecast pages compute the Kp threshold for your latitude in real time - useful to only step out when it's actually worth it.

How to actually prepare

Auroras rarely give long warning. A coronal mass ejection takes 18 to 96 hours to cover the 150 million km from Sun to Earth, but its precise content (intensity, magnetic-field Bz polarity) is only known 30 to 60 minutes before arrival, when it crosses the ACE/DSCOVR satellite at the L1 Lagrange point.

That's a short action window. Three recommendations:

  • Enable Pulsar alerts. Get a free notification (no complex sign-up) the moment Kp crosses your threshold. See the contact form or the mobile app (15 May 2026).
  • Scout your spot. Identify a place with a clear northern horizon and low light pollution within 30-60 km. Our "Where?" and "How?" pages cover the right reflexes.
  • Learn the photo basics. A faint aurora is more visible to a sensor than to the eye. Our photography guide walks through ISO 1600-3200, max aperture, 5-10 s exposure, manual focus to infinity.

Forecast calendar: best 2026 viewing windows

No model can predict a solar flare more than 48 hours ahead - the Sun-Earth chain is too chaotic. But statistically, some periods of the year concentrate more activity at French latitudes. Watch these windows for 2026:

  • March-April 2026 (spring equinox): Russell-McPherron effect - Earth's axial tilt against the solar magnetic field favours magnetic reconnections. Around 30% of G3+ storms statistically occur within 6 weeks of either equinox.
  • September-October 2026 (autumn equinox): same effect, combined with still-strong solar activity in the descending phase of cycle 25. Likely the best French window of the year.
  • June-July 2026: least favourable, despite solar activity - short summer nights (astronomical twilight never reached north of Nantes in June) sharply limit the observation window. The 12 August eclipse offsets this with a unique chance to observe the active Sun.
  • November-December 2026: long nights + residual activity = solid mid-latitude compromise. Complex magnetic active regions (β-γ-δ classes) typically emerge in the second half of the cycle.

Aurora colours: what you'll actually see

On photos, auroras look bright green and deep red. To the naked eye from France, the experience is different. Here's what to expect by intensity:

  • Kp 5-6 (weak aurora): diffuse grey glow on the northern horizon, easily mistaken for distant light pollution. Only visible with long exposure (5-10 s) on a sensor. The most common case.
  • Kp 7 (moderate aurora): vertical bands faintly tinted green or red, perceptible to the eye. Slow movement noticeable over a few minutes.
  • Kp 8 (strong aurora): clear colours, real-time motion, occasional fast "dances". Red dominates at French latitudes because only the top of the auroral arc reaches our horizons.
  • Kp 9 (extreme aurora, like May 2024): aurora overhead possible across central France, spectacular moving columns, saturated colours visible even from moderately light-polluted areas.

Tip: your peripheral vision is more sensitive to faint light than your central vision. Don't stare at the horizon - let your gaze sweep the sky and you'll "see" a faint aurora you would otherwise miss.

Frequently asked questions

Can I see an aurora from Paris or Lyon in 2026?

Yes - given a Kp ≥ 7 event. Statistically, 3 to 5 such events occur per year in an active cycle 25. Latitude isn't the main obstacle; light pollution is. Drive out of the city, find a high point with a clear northern horizon, and wait.

Do I need expensive gear?

No. A recent smartphone (iPhone 11+, Pixel 5+, Samsung S20+) in night mode is enough to confirm a faint aurora and capture a moderate one. For better shots, a mirrorless body with APS-C or full-frame sensor, a fast lens (f/1.8-f/2.8) and a basic tripod do the job.

What's the difference between Kp and the G scale?

The Kp index (0-9) measures global geomagnetic disturbance every 3 hours. The G scale (G1-G5) translates that intensity into operational impact (power grids, satellites). G1 ≈ Kp 5, G5 ≈ Kp 9. For visual observation in France, Kp is what matters - and Pulsar shows it live, already compared against your city's threshold.

What makes Pulsar's forecasts useful for France?

Pulsar aggregates the full set of real-time scientific measurements (solar wind at L1, solar imagery, magnetometers) and translates them into per-city visibility. The specificity: factoring in actual geomagnetic latitude (different from geographic latitude) and local light pollution to tell you what you will see from your home. That translation is what turns raw data into an actionable recommendation - "tonight in Lyon, head out at 11:30 p.m. if the northern sky is clear".

The 12 August 2026 eclipse: a bonus event

2026 has another major sky event in store: the total solar eclipse of 12 August 2026. Total over Iceland and northern Spain; deeply partial (up to 96% Sun coverage) from southwestern France. A rare chance to observe the Sun without seeing it - right in the middle of an active cycle.

Details on our dedicated page: per-city times, visibility map, safety guide (ISO 12312-2 glasses required).

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