Abstract
Abstract We report an asymmetry in the distribution of low frequency variable (LFV) radio sources towards the centre-anticentre regions of our galaxy. The study is based on 15 years' monitoring of a large sample of sources observed with Culgoora Array at 80 and 160 MHz. This asymmetry is in marked contrast with the symmetrical distribution of non-variable sources from the same sample. Median values of the corresponding modulation indices on both short and long time scales also show a statistically significant increase towards the Galactic centre compared with the anticentre region. These results strongly suggest that LFV has an interstellar origin and that the most likely mechanism is refractive scintillation.
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