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- Wed Mar 25, 2020 6:03 am
- Forum: 4D and Beyond: Temporal Physics
- Topic: Waiting for the Sun
- Replies: 6
- Views: 12073
Coronal holes appear as dark areas in the solar corona in extreme ultraviolet (EUV) and soft x-ray solar images. They appear dark because they are cooler, less dense regions than the surrounding plasma and are regions of open, unipolar magnetic fields.