Pulsar scintillations from corrugated reconnection sheets in the ISM

TL;DR

This paper proposes that surface waves along interstellar current sheets cause pulsar scintillations, matching observed properties and offering new ways to study the interstellar medium and perform high-precision pulsar measurements.

Contribution

It introduces a novel mechanism involving surface waves on magnetic current sheets to explain pulsar scintillations, aligning with observations and predicting specific spectral features.

Findings

Surface waves on interstellar current sheets explain pulsar scintillations.

The model reproduces the observed spacing and amplitudes of scintillation arcs.

Multi-frequency VLBI observations can test this mechanism.

Abstract

We show that surface waves along interstellar current sheets closely aligned with the line of sight lead to pulsar scintillation properties consistent with those observed. This mechanism naturally produces the length and density scales of the ISM scattering lenses that are required to explain the magnitude and dynamical spectrum of the scintillations. In this picture, the parts of warm ionized interstellar medium that are responsible for the scintillations are relatively quiescent, with scintillation and scattering resulting from weak waves propagating along magnetic domain boundary current sheets, which are both expected from helicity conservation and have been observed in numerical simulations. The model statistically predicts the spacing and amplitudes of inverted parabolic arcs seen in Fourier-transformed dynamical spectra of strongly scintillating pulsars with only 3 parameters. Multi-frequency, multi-epoch low frequency VLBI observations can quantitatively test this picture. If successful, in addition to mapping the ISM, this may open the door to precise nanoarcsecond pulsar astrometry, distance measurements, and emission studies using these 10AU interferometers in the sky.