A plasma-lensing model with cylindrical filaments whose thin ionized skins are seen edge-on reproduces the delay evolution and asymmetry of a Crab pulsar echo, but not its magnification.
Echoes of Giant Pulses from the Crab Pulsar
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abstract
We have detected occasional, short-lived ``echoes'' of giant pulses from the Crab pulsar. These echo events remind us of previously reported echoes from this pulsar, but they differ significantly in detail. Our echo events last at most only a few days; the echo emission lags the primary emission by only 40-100 musec. The echoes are consistently weaker and broader than the primary emission, and appear only at the lower of our two simultaneous observing frequencies. We suggest that these echoes are created by refraction in small plasma structures -- plasma clouds or magnetic flux ropes -- deep within the Crab nebula. If this is true, our echoes provide a new probe of small-scale structures within the inner synchrotron nebula.
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A Melody in the Noise: Modeling Echoes of the Crab Nebula
A plasma-lensing model with cylindrical filaments whose thin ionized skins are seen edge-on reproduces the delay evolution and asymmetry of a Crab pulsar echo, but not its magnification.