Abstract
The observational conditions for extraterrestrial infrared emission is remarkably improved at the balloon altitudes comparing to those at the airplane altitudes. By utilizing this advantage effectively, a number of observations of the diffuse infrared emission in the Galaxy have been successfully done, providing unique information on new phenomena in interstellar space as well as new structures of the Galaxy. The observations of near infrared brightness survey in the Galaxy have first given a comprehensive picture of the stellar distribution in the inner region of the Galaxy, while the far infrared brightness mappings of the galactic plane have revealed the distribution of interstellar dust condensed tightly in the galactic plane. Introduction of spectroscopic observations have opened a new scope for studies of interstellar space; for instance, the observations of [CII]-line (157.7 μm) have shown that the emission is very strong and ubiquitously distributed in interstellar space. The [CII]-line would become a useful probe for investigation of the ever unexplored part of the Galaxy i.e. photodissociation regions or [CIF]-regions with softly ionized, warm and medium density gases.
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