Posts by 

Raúl Cortés

Sun

Sun activity: After the storm, a calm

Sun activity for March 25, 2023. After this week's powerful geomagnetic storming and fabulous auroras ... a calm in Earth's magnetic field.
Sun

Sun activity archive for February 2023

Sun activity archive for February 2023. A daily record of our local star, as it edges toward the peak of Solar Cycle 25, expected in mid-decade.
Sun

Sun activity archive for January 2023

Sun activity archive for January 2023. A daily record of flaring, big filaments and prominences, and other sorts of activity, on our local star.

Sun glossary: A list of solar terms and their definitions

The active sun is frequently in the news as Solar Cycle 25 ramps up. Here's a handy sun glossary so you can get up to speed on all the solar terms you'll see.

Aurora season: Why more auroras at equinoxes?

An aurora season occurs in October and March each year, due to the way the magnetic fields of the sun and the Earth work in conjunction with sun-Earth geometry.
Sun

Why are east and west on the sun reversed?

East and west on the sun are opposite from what you might expect. On the sun, east is to the left and west is to the right. Learn why here.