Pulsar radio pulses - the frequency-dependent dispersion measure and the extra arrival-time delay

Journal Article · Wed Oct 01 00:00:00 EDT 1986 · Sov. Astron. Lett. (Engl. Transl.); (United States)

OSTI ID:5748649

Kuz'min, A D

The dispersion measures (DM) of eight pulsars begin to increase systematically as the radio frequency drops below 100 MHz. The corresponding extra delay in the pulse arrival time is compatible with Shitov's (1971) idea that the pulsar magnetic field lines are being twisted; the twist angle would then be proportional to the neutron star rotation rate and to the fourth power of the emission zone's height above the surface. This superdispersion time delay may explain why DM measurements are frequency-dependent. The effect can be avoided by confining measurements of DM to the 100-1000 MHz range. 10 references.

• Research Organization: Fizicheskii Institut, Moscow, USSR
• OSTI ID: 5748649
• Journal Information: Sov. Astron. Lett. (Engl. Transl.); (United States), Vol. 12
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
PULSARS
RADIOWAVE RADIATION
MAGNETIC FIELD CONFIGURATIONS
NEUTRON STARS
PHASE VELOCITY
PULSES
ROTATION
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
MOTION
RADIATIONS
STARS
VELOCITY
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources