Variations in the radiation intensity of the pulsar B0950+08: 9 years of monitoring at a frequency of 110 MHz

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Abstract

The analysis of variations in the radiation intensity of the pulsar B0950+08 from 2014 to 2022 with scales from minutes to years was carried out. The observations were obtained in a round-the-clock daily survey conducted on the Large Phased Array (LPA) radio telescope. The high variability of radiation is shown not only from pulse to pulse, but also at scales greater than 3 min. The average value of the estimated amplitude of these variations in 3.2 minutes is 25 Jy, the modulation index is 1. The average relative amplitude of the interpulse (IP) is 2.00 ± 0.28 % of the main pulse. In individual pulses, the amplitude of the interpulse may exceed the amplitude of the main pulse (MP), but this is a rare event. Radiation is observed in almost the entire period of the pulsar. For the first time, the relative amplitude of radiation between the main pulse and the interpulse (radiation bridge) was measured. When averaging about 10 hours, it varies from 0.8% to 1.31% with an average value of 1.04 ± 0.28 %. A high correlation was found between MP and IP amplitude variations both when averaging profiles over 3.2 minutes and when averaging over years. This correlation is due to refractive interstellar scintillation. The frequency scale of IP diffraction interstellar scintillation was measured for the first time and it was shown that the spectral forms for IP and MP are well correlated and have the same frequency scale. There are strong variations in the frequency scale of scintillation f dif from session to session (time interval from one day) on scales of 200–800 kHz. The refractive scale of scintillation for 1–2 days has been determined. A modulation of radiation with a characteristic scale of about 130 days was detected, which, apparently, is also associated with refractive scintillation.

About the authors

T. V. Smirnova

Lebedev Physical Institute

Author for correspondence.
Email: tania@prao.ru

Astro space center, Pushchino radio astronomy observatory

Russian Federation, Pushchino, Moscow reg.

M. O. Toropov

LLC TEK Inform

Email: tania@prao.ru
Russian Federation, Moscow

S. A. Tyul'bashev

Lebedev Physical Institute

Email: tania@prao.ru

Astro space center, Pushchino radio astronomy observatory

Russian Federation, Pushchino, Moscow reg.

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