The flux density variations for five features in the W 49 N H2O maser occurring during the 1969-1978 period are explored. It is shown that the flux density variation of a maser cloudlet can be decomposed into a large amplitude variation and some frequent irregular fluctuations about a constant flux density level. In the second part, a model for describing the flux density variation of type I H2O masers in an ordinary physically quiet environment is proposed which is valid for a wide range of time scales (100 s to 10 to the 8th s). With a constant maser pumping rate, flux density variations can be attributed to the rotation of the whole maser, the possible spin of the maser cloudlets, or Kelvin-Helmholtz instability occurring on the surface of the cloudlet.
Peng RS. Time variation of type I H2O masers. I - Long term flux density variation of the W 49N H2O maser[J]. ASTRONOMY & ASTROPHYSICS,1989,216(1-2):165-172.
APA
Peng RS.(1989).Time variation of type I H2O masers. I - Long term flux density variation of the W 49N H2O maser.ASTRONOMY & ASTROPHYSICS,216(1-2),165-172.
MLA
Peng RS."Time variation of type I H2O masers. I - Long term flux density variation of the W 49N H2O maser".ASTRONOMY & ASTROPHYSICS 216.1-2(1989):165-172.
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