On three-dimensional information pictures of chromospheric spicules

Abstract

Almost all observations of the sun, including all kinds of spectropliotometry, magnetic field and radial velocity measurements, and also spectroheliographic researches supply us with only two-dimensional (flat) information about the object. We obtain data on the distribution of a physical parameter in two-space dimensions (in some cases one of these dimensions is the wavelength in the spectrum) or in space-time dimensions. Only when we take a cinema-film (MAMEDOV, 1966) of the spectral changes over the disk with a slowly moving image of the sun on the slit, we have a real possibility of obtaining three-dimensional information: two space dimensions Fig. la. Fig. lb.and one wavelength dimension. This seems to be true only if the time scale of the physical processes under investigation is greater than the cinema exposure time. Thus we have spectrograms taken so near to one another on the object that they form a continuous sequence of spectral changes over the object (a portion of the solar disk, sunspots, flares, chromosphere). The method was previously described by Mamedov and applied to the H and K lines. In some respects it is similar to the well-known method of Deslandres, although the latter was restricted to the case of two-dimensional information on the radial velocity distribution over the solar disk.The same method has now been applied to the chromospheric Ha line. The band Solar Physics 6 (1969) 41-43; O D. Reidel Publishing Conzpany, Dordrechf -Holland

The dynamics of accelerating coronal bullets

“…Similar considerations also are addressed in several recent investigations of the formation and maintenance of spicules (cf. e.g., Athay 1976 and references therein;Hasan and Venkatakrishnan 1981 ;Hollweg 1972Hollweg , 1981Mamedov and Orudzhev 1978 ;Nakagawa 1977 ;Roberts 1978 ;Papushev 1980). Spicules are jets of dense plasma, channeled along magnetic field lines, which reach heights of about 10 4 km before flowing back into the chromosphere (Beckers 1972).…”