Physics
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995inpht..36..893m&link_type=abstract
Infrared Physics & Technology, Volume 36, Issue 5, p. 893-907.
Physics
1
Scientific paper
Travelling ionospheric disturbances (TID) have been reported by various authors in the past: they have been observed in the ionosphere by means of indirect techniques, like disturbances in the propagation of radio-waves. Mesospheric disturbances, like noctilucent clouds, (NLC) have been also widely quoted in literature, being observed through the Sunlight scattering in night time. We present observations of TSD (travelling stratospheric disturbances) during the stratospheric balloon program ULISSE devoted to the study of sky brightness in the wave-length region 300-3000 micron. The observed TSD appear to be localized at a typical altitude of 80-150 km with peculiar velocities of 50-200 m sec-1. Spectral properties of the emitted radiation have been investigated by means of multichannel photometers: two types of TSD have been found. The first one has a spectral emissivity consistent with the standard stratospheric composition (H2O and O3 being the most important emitters): the second type of TSD, observed about one month after St. Helen explosion in 1980, has the typical spectrum of dust with an emissivity ɛ ~= 1/(λ) and an abundance of the order of 10 particles per cm-3 with submicron radius.
Melchiorri Bianca
Melchiorri Francesco
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