11. See Zeeman effect , magneto-optic Kerr effect, Voigt Effect or Faraday effect. 12. The magnetic field of a star can be measured by means of the Zeeman effect . 13. The spin-orbit coupling, and magnetic field was applied leading to Zeeman effect . 14. Observations using the Zeeman effect show that prototypical sunspots come in pairs with opposite magnetic polarity. 15. His doctoral thesis dealt with the effects of Zeeman effect on spectral lines of noble gases. 16. The first detection of the Zeeman effect in another galaxy was made through observations of hydroxyl megamasers. 17. A magnetic field is added, which lifts the degeneracy in m due to the Zeeman effect . 18. In 1908, he used the Zeeman effect with a modified spectroheliograph to establish that sunspots were magnetic. 19. Today, the Zeeman effect is used to produce magnetograms showing the variation of magnetic field on the sun. 20. And some materials may change colour when a magnetic field is applied, for example by the Zeeman effect .
