Results 271 to 280 of about 535,368 (303)

The Structure of Comet Tails

Scientific American, 1986
Present models of the plasma tails of comets are described. The interaction of the solar wind with ions from the cometary atmosphere is discussed, and the phenomenon of magnetic reconnection observed in plasma tails is explained. The accomplishments of the ICE mission to the Comet Giacobini-Zinner are summarized, and the tasks and expected ...
John C. Brandt, Malcolm B. Niedner
openaire   +2 more sources

Neutral sodium tails in comets

Advances in Space Research, 2002
Abstract In the last few years, after a new type of tail composed only of neutral sodium atoms had been discovered in Comet Hale-Bopp, much attention has been given to the release and distribution of sodium in comets. It was not the first time that a sodium tail had been observed in a comet, but the amount of data collected from Comet Hale-Bopp in ...
Cremonese, G., Huebner, W.F., Rauer, H., Boice, D.C.   +3 more
openaire   +2 more sources

Intensity Measurements on the CO + Comet Tail, and the BO α and β Molecular Band Systems

, 1960
Relative band intensities of the comet tail system (A2Π-X2Σ) of CO+ and of the α(A2Π-X2Σ) and β(B2Σ-X2Σ) systems of BO have been measured photoelectrically. They have been interpreted with the aid of Franck-Condon factors qν'νdouble prime and r-centroids
D. Robinson, R. W. Nicholls
semanticscholar   +1 more source

Assessment of the clinical utility of the rim and comet-tail signs in differentiating ureteral stones from phleboliths.

AJR. American journal of roentgenology, 2001
OBJECTIVE This study was designed to assess interobserver variability in identifying the rim and comet-tail signs and to determine the clinical utility of these signs in determining whether or not the calcifications with which they are associated ...
Amy Rochester Guest, R. Cohan, Melvyn Korobkin, J. Platt, Claudia C. Bundschu, Isaac R. Francis, Achamyeleh Gebramarium, Uwada M. Murray   +7 more
semanticscholar   +1 more source

Plasma Tail and Dust Tail of Comets

1994
Generally, a comet has two tails; the blue plasma tail and the red dust tail (or Type 1 (ion) tail and Type 2 (dust) tail). The plasma tail is caused by an interaction between the solar wind and the cometary plasma, while the dust tail is by the solar radiation pressure to the cometary dust. The first purpose of the present paper is to review our works
Takao Saito, Shigeyuki Minami, Yukio Kozuka, Keiji Saito   +3 more
openaire   +2 more sources

Comet-tail artifact from cholesterol crystals: observations in the postlithotripsy gallbladder and an in vitro model.

Radiology, 1990
The "comet tail" is a well-known ultrasound artifact that appears as a series of parallel bands radiating from a source. This artifact was observed in the gallbladder lumen in eight of 10 patients after extracorporeal shock wave lithotripsy of ...
R. Shapiro, F. Winsberg
semanticscholar   +1 more source

The Physics of Comet Tails

Annual Review of Astronomy and Astrophysics, 1968
Physics of comet tails, discussing structure and orientation, plasma and dust composition, space probe rendezvous, artificial comet and ...
openaire   +2 more sources

On the classification of comet plasma tails

Solar System Research, 2017
The investigation of plasma tails of comets is an important part of comet research. Different classifications of plasma tails of comets are proposed. Plasma acceleration in the tails is investigated in sufficient detail. Several cometary forms are explained. Plasma tails of Mars and Venus were observed during the first studies of these planets.
E. R. Mozhenkov, Oleg Vaisberg
openaire   +2 more sources

Experimental Oscillator Strength of the Comet‐Tail System of CO+

, 1960
The radiative lifetimes (τv′) of the upper electronic state of the comet‐tail bands of CO+ have been measured. There is an appreciable variation (about 50%) of τv′ with v′, the upper electronic state vibrational quantum number. By using an average τ = (2.
R. Bennett, E. W. Dalby
semanticscholar   +1 more source

The Comet-Tail (A(2)Pi(i)-X(2)Sigma(+)) System of (12)C(16)O(+): A Reinvestigation.

Journal of Molecular Spectroscopy, 2000
The emission spectrum of the comet-tail (A(2)Pi(i)-X(2)Sigma(+)) system of (12)C(16)O(+) produced in the cathode glow of a hollow-cathode discharge tube and photographed in the spectral region 3345-8500 Å at high resolution was reinvestigated.
Haridass, Prasad, Reddy
semanticscholar   +1 more source