The 1997 event in the Crab pulsar revisited
F. Graham Smith, A. G. Lyne, and C. Jordan Jodrell Bank Centre for, Astrophysics
TL;DR
This paper reexamines a complex 1997 radio pulse event from the Crab pulsar, attributing the phenomena to plasma cloud refraction, and suggests filamentary structures with specific size and density in the nebula.
Contribution
It provides a detailed analysis of the 1997 event and proposes a model involving plasma filaments in the Crab Nebula as the cause.
Findings
Refraction at plasma cloud edges explains the observed phenomena.
The plasma cloud likely consists of filaments about 3 x 10^11 meters in diameter.
Electron density in the filaments is approximately 10^4 cm^-3.
Abstract
A complex event observed in the radio pulses from the Crab pulsar in 1997 included echoes, a dispersive delay, and large changes in intensity. It is shown that these phenomena were due to refraction at the edge of a plasma cloud in the outer region of the Crab Nebula. Several similar events have been observed, although in less detail. It is suggested that the plasma cloud is in the form of filaments with diameter around 3 x 10^11m and electron density of order 10^4 cm-3
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