A Preliminary Report on Chromospheric Spicules of Extremely Short Lifetime.
Abstract
Small spikes of chromospheric material, observed in Ha with the coronagraph and quartz-polaroid monochromator, are described. These spicules, seen in polar regions of the sun, have very brief lifetimes, amounting on the average to 4 or 5 minutes. The typical spicule is low in brightness and has a height at maximum of less than 15 seconds of arc. At least in polar regions, they appear to be present in greater or smaller numbers at all times. The spicules are apparently distributed at random in the polar regions stud- ied. The behavior of the spikes, while well typed, exhibits considerable variation. Possible association with polar coronal "plumes" and with "rice grains" of the disk is discussed
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1945
- DOI:
- 10.1086/144699
- Bibcode:
- 1945ApJ...101..136R