How Pulsars Work Like Lighthouses

This animation takes us into a spinning pulsar, with its strong magnetic field rotating along with it. Clouds of charged particles move along the field lines and their gamma-rays are beamed like a lighthouse beacon by the magnetic fields. As our line of sight moves into the beam, we see the ...

As the pulsar spins around on its axis, it sweeps a beam of radiation around the cosmos like a turning lighthouse that shines out into the sea. From Earth, we see the beam as it sweeps rapidly past as a pulse of radiation.

External viewers see pulses of radiation whenever this region above the the magnetic pole is visible. Because of the rotation of the pulsar, the pulses thus appear much as a distant observer sees a lighthouse appear to blink as its beam rotates.

A naïve estimate for f of roughly ... Observational evidence summarised in Figure 16 suggests that shorter period pulsars have wider beams and therefore larger beaming fractions than their long-period counterparts [269, 243, 37, 360]. ... Beaming fraction plotted against pulse ...

A naïve estimate of f is 20%; ... and magnetic axes [238]. Observational evidence suggests that shorter period pulsars have wider beams and therefore larger beaming fractions than their long-period counterparts [171, 149, 32, 231]. It must be said, however, that a consensus ...

The pulses that give a pulsar its name are seen each rotation period of the star as a radiation beam generated by the neutron star sweeps across our line of sight to the pulsar. In that sense they are very much like lighthouses, but unlike terrestrial lighthouses, pulsars can send out beams ...

The name pulsar blends “pulse” and “star,” but pulsars are not pulsating stars. Like lighthouses, they continuously emit rotating beams of radiation and appear to flash each time the beam sweeps across the observer’s line of sight. The pulse periods are quite stable because they equal the rotation periods of massive neutron stars.

3) Pulsars have extremely strong magnetic fields, ranging from roughly 1 trillion to multiple quadrillions of times larger than the Earth’s magnetic field. 4) Not all neutron stars are pulsars. All pulsars are neutron stars. This entry was posted in Astronomy and tagged lighthouse, neutron star, pulsar, rotation.

But one special class of neutron stars, called pulsars, have jets of radiation that pass by Earth once per rotation, creating a lighthouse effect whereby they appear to us as pulsating stars (hence the name "pulsar"). Many models have been proposed to explain the nature of pulsar emissions.