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| English | German |
| chromospheric activity | Aktivität in der Chromosphäre |
| coronal activity | Koronaaktivität |
| increased activity near sun spots | erhöhte Aktivität in der Nähe der Sonnenflecken |
| optical activity | Rotationspolarisation (it causes a rotation of the axes of polarization of the light) |
| optical activity | optisches Drehvermögen (it causes a rotation of the axes of polarization of the light) |
| optical activity | natürliche optische Drehung (it causes a rotation of the axes of polarization of the light) |
| optical activity | Drehung der Polarisationsebene (if causes a rotation of the axes of polarization of the light) |
| optical activity | optische Aktivität (it causes a rotation of the axes of polarization of the light) |