
TY  - JOUR
A1  - Ivanov, VP 
A1  - Stankevich, KS 
T1  - Nonstationary Phenomena in the Radiation of Young Supernova Remnants
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1987
VL  - 40
IS  - 6
SP  - 801
EP  - 814
KW  - 
UR  - https://doi.org/10.1071/PH870801 
N2  - The time variation of the radio emission from the supernova remnants Cassiopeia A, the Crab Nebula and Tycho Brahe (SN 1572) is investigated. There is a frequency dependence on the rate of decrease in the flux density of Cassiopeia A for the period 1957 to 1984. The (positive) spectral index has a secular decrease and also, for frequencies above 320 MHz, slight oscillations with a six-year period. The radio emission from the Crab Nebula was constant from 1953 to 1975 but has since decreased accompanied by a change in spectral index. The average decrease of the flux density of SN 1572 from 1963 to 1983 was 0·52% per year, close to the value predicted for adiabatic expansion. 
ER  -

