Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26at....7...29s&link_type=abstract
Astronomical and Astrophysical Transactions (ISSN 1055-6796), vol. 7, no.1, p. 29-45
Astronomy and Astrophysics
Astronomy
Broadband, Extragalactic Radio Sources, Frequency Modulation, Frequency Ranges, Indexes (Ratios), Latitude Measurement, Periodic Variations, Radio Astronomy, Radio Emission, Correlation, Frequency Distribution, Low Frequencies, Scintillation, Statistical Analysis, Time Series Analysis
Scientific paper
A statistical analysis of the modulation index (m) distribution along the galactic latitude for different samples of variable extragalactic radio sources has been performed in a wide frequency range from 80 MHz to 37 GHz. The distributions of the median m values have demonstrated a striking monotony at all frequencies from meters to millimeters in spite of a considerable scattering in the individual m values. Some correlation of m with the galactic latitude was known for low frequency variability and flickering. It was explained by refraction interstellar scintillation (RISS). The same distribution of m is unexpected for centimeter and millimeter wavelengths. The galactic latitude distribution of m obtained are compared with a simple RISS theory. It is shown that the difference between the observed data and the simple theory of RISS is significant at low galactic latitudes absolute value of b less than or equal to 15 deg 30 deg almost for all frequencies considered. Some speculations about the galactic latitude distribution discovered are given in the frame of interstellar scintillation. One of them is the flattening of the electron density fluctuation spectrum at low galactic latitudes.
Larchenkova T. I.
Shapirovskaya Ya. N.
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