
TY  - JOUR
A1  - Bray, RJ 
A1  - Loughhead, RE 
T1  - Isophotal Contour Maps of Sunspots
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1962
VL  - 15
IS  - 4
SP  - 482
EP  - 489
KW  - 
UR  - https://doi.org/10.1071/PH620482 
N2  - Maps are presented showing the complex intensity distribution in the umbrae and penumbrae of two large spots. The umbral isophotes show several points of minimum intensity, in one of which the temperature is some 500 oK below the average for the umbra. This extra-dark region, or "core", is only a few seconds of arc in diameter and is located near one end of the umbra. 
ER  -

