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We present results from multi-epoch neutral hydrogen (HI) absorptionobservations of six bright pulsars with the Arecibo telescope. Moving throughthe interstellar medium (ISM) with transverse velocities of 10--150 AU/yr,these pulsars have swept across 1--200 AU over the course of our experiment,allowing us to probe the existence and properties of the tiny scale atomicstructure (TSAS) in the cold neutral medium (CNM). While most of the observedpulsars show no significant change in their HI absorption spectra, we haveidentified at least two clear TSAS-induced opacity variations in the directionof B1929+10. These observations require strong spatial inhomogeneities ineither the TSAS clouds' physical properties themselves or else in the clouds'galactic distribution. While TSAS is occasionally detected on spatial scalesdown to 10 AU, it is too rare to be characterized by a spectrum of turbulentCNM fluctuations on scales of 10-1000 AU, as previously suggested by some work.In the direction of B1929+10, an apparent correlation between TSAS andinterstellar clouds inside the warm Local Bubble (LB) indicates that TSAS maybe tracing the fragmentation of the LB wall via hydrodynamic instabilities.While similar fragmentation events occur frequently throughout the ISM, thewarm medium surrounding these cold cloudlets induces a natural selection effectwherein small TSAS clouds evaporate quickly and are rare, while large cloudssurvive longer and become a general property of the ISM.

Arecibo Multi-Epoch HI Absorption Measurements Against Pulsars: Tiny-Scale Atomic Structure