Abstract
We present preliminary results from the recent multi-epoch HI absorption measurements toward several pulsars using the Arecibo telescope. We do not find significant variations in optical depth profiles over periods of 4 months and 9 years. The upper limits on the optical depth variations in directions of B0823+26 and B1133+16 are similar on scales of 10–20, 350 and 500 AU. The large number of non detections of the tiny scale atomic structure suggests that the AU-sized structure is not ubiquitous in the interstellar medium.
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Stanimirović, S., Weisberg, J., Hedden, A. et al. The Tiny-Scale Atomic Structure: Gas Cloudlets or Scintillation Phenomenon?. Astrophysics and Space Science 292, 103–109 (2004). https://doi.org/10.1023/B:ASTR.0000045005.36554.36
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DOI: https://doi.org/10.1023/B:ASTR.0000045005.36554.36