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Thus, the idea that the rise of the F-layer caused the apparent disappearance of bubbles in the 630-nm airglow images is not supported.
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Thereafter, for experiments in both groups, the mean bubble shrinking rate while breathing heliox mixing was calculated as the apparent cross-sectional area in μm min−1, assuming constant or near-constant slopes from the time of isobaric breathing gas shift (A experiments) or immediately post-compression (B experiments) until disappearance of bubble.
A contributing cause for the disappearance of N2 bubbles during heliox breathing after recompression could be that once the bubbles have become smaller, surface tension will increase the pressure inside the bubble sufficient to overcome the pressure gradients driving gas (i.e. helium) into the bubble.
We do not know of any reports that show the disappearance of plasma bubbles in the field of view of airglow images.
We note that even after this rather sudden disappearance of the bubbles, some faint structures remain recognizable until the end of the observation (2020 UT at Darwin and 1937 UT at Sata). Figure 1 All-sky airglow images at a wavelength of 630 nm obtained at Darwin (a-f) and Sata (g-l) on 8 August 2002.
We should note that the disappearance of the bubbles in the airglow images is not due to the degradation of the image quality associated with the airglow intensity reduction; we had sufficient CCD counts to identify airglow structures even after 1830 UT.
This idea also explains why the spread-F signature in the ionograms did not disappear even after the disappearance of the bubble in the 630-nm airglow images.
This decrease of airglow intensity coincided with the disappearance of the bubble structures.
The spread-F signatures lasted until sunrise at both stations and were present even after the disappearance of the bubble from the airglow images at 1900 UT.
The disappearance of the bubble was likely to be caused by plasma drift across the geomagnetic field line following the polarization electric field in the MSTIDs.
Follow-up bronchoscopy was performed 6 months postoperatively and indicated a disappearance of the bubbling as well as the resolution of the chronic cough to that of pre-procedural levels.
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