Pulsar Scintillation Studies and Structure of the Local Interstellar Medium

Pulsar Scintillation and the Local Bubble

We present here the results from an extensive scintillation study of twenty pulsars in the dispersion measure (DM) range 3− 35 pc cm−3 carried out using the Ooty Radio Telescope at 327 MHz, to investigate the distribution of ionized material in the local interstellar medium. Observations were made during the period January 1993 to August 1995, in which the dynamic scintillation spectra of these...

Study of the LISM using Pulsar Scintillation

We present here the results from an extensive scintillation study of twenty pulsars in the dispersion measure (DM) range 3 − 35 pc cm carried out using the Ooty Radio Telescope, to investigate the distribution of ionized material in the local interstellar medium (LISM). Our analysis reveals several anomalies in the scattering strength, which suggest that the distribution of scattering material ...

The Origin of Radio Scintillation in the Local Interstellar Medium

We study three quasar radio sources (B1257-326, B1519-273, and J1819+385) that show large amplitude intraday and annual scintillation variability produced by the Earth’s motion relative to turbulent-scattering screens located within a few parsecs of the Sun. We find that the lines of sight to these sources pass through the edges of partially ionized warm interstellar clouds where two or more cl...

The Interstellar Medium as a Gravity Wave Detector

An observer, situated several thousand light-years away from a radio pulsar, finds himself embedded in the diffraction pattern resulting from the propagation of the radio waves through the irregular interstellar medium. The observer’s movement relative to the pattern causes an apparent scintillation of the pulsar. A binary star, situated close to the pulsar’s line-of-sight, is generating relati...

Probing the Interstellar Medium on AU Size Scales Using Pulsar Scintillation