2024-03-29T00:51:15Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00022673
2023-01-16T04:45:34Z
879:880:881
LONG-TERM TREND OF SOLAR CORONAL HOLE DISTRIBUTION FROM 1975 TO 2014
Fujiki, K.
66788
Tokumaru, M.
66789
Hayashi, K.
66790
Satonaka, D.
66791
Hakamada, K.
66792
Sun: activity
Sun: general
Sun: magnetic fields
We developed an automated prediction technique for coronal holes using potential magnetic field extrapolation in the solar corona to construct a database of coronal holes appearing from 1975 February to 2015 July (Carrington rotations from 1625 to 2165). Coronal holes are labeled with the location, size, and average magnetic field of each coronal hole on the photosphere and source surface. As a result, we identified 3335 coronal holes and found that the long-term distribution of coronal holes shows a similar pattern known as the magnetic butterfly diagram, and polar/low-latitude coronal holes tend to decrease/increase in the last solar minimum relative to the previous two minima.
journal article
IOP publishing
2016-08
application/pdf
The Astrophysical Journal Letters
2
827
L41
L41
http://dx.doi.org/10.3847/2041-8205/827/2/L41
http://hdl.handle.net/2237/24822
2041-8205
https://nagoya.repo.nii.ac.jp/record/22673/files/apjl_827_2_L41.pdf
eng
https://doi.org/10.3847/2041-8205/827/2/L41
© 2016. The American Astronomical Society