Aurora australis El Calafate tonight

7-day outlook for El Calafate

Based on CME arrival predictions from NASA DONKI. Arrival times ±6 hours.

What Kp is needed here?

El Calafate sits at a magnetic latitude of approximately 50°S. The Kp index - a global measure of geomagnetic activity on a scale from 0 (quiet) to 9 (extreme storm), updated every 3 hours - needs to reach Kp 5–6 before the auroral oval expands far enough north to be visible from here.

At Kp 5–6, visibility is possible from El Calafate but skies need to be clear and dark. Cloud cover and light pollution remain the main obstacles even when Kp is high enough.

Best dark sky sites near El Calafate

Light pollution is the biggest obstacle after cloud cover. These sites give you the best dark southern horizon within reach.

Best time to see the aurora australis in El Calafate

At 50°S magnetic latitude, El Calafate sits at the outer edge of regular aurora australis territory. Only the southern winter months, May through July, occasionally bring storms powerful enough to push the oval this far north. Outside this window, there is insufficient darkness for aurora to be visible.

Activity peaks around the March and September equinoxes, when Earth's magnetic field geometry is most favourable for coupling with the solar wind. These windows produce the strongest aurora australis events of the year for observers at this latitude.

Outside May through July, twilight prevents aurora visibility even during significant geomagnetic storms. The season is short, but equinox months on either side of winter can extend it when timing is favourable.

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