Page:EB1911 - Volume 02.djvu/978

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Plate II.
AURORA
1911 Britannica - Aurora Polaris - Auroral bands.png
Fig. 3—AURORAL BANDS.


1911 Britannica - Aurora Polaris - Auroral curtain.png
Fig. 4—AURORAL CURTAIN BELOW AN ARC.


1911 Britannica - Aurora Polaris - Auroral corona.png
Fig. 5.—AURORAL CORONA.