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  1. Article

    Open Access

    Near-infrared sky background fluctuations at mid- and low latitudes

    The emission of the upper atmosphere introduces an additional variable component into observations of astronomical objects in the NIR 700–3,000 nm range. The subtraction of this component is not easy because i...

    G. Moreels, J. Clairemidi, M. Faivre, D. Pautet… in Experimental Astronomy (2008)

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  2. Article

    Jets And Arcs In The Coma Of Comet Hale-Bopp From August 1996 To April 1997

    An observation program for measuring the activity of Comet Hale-Bopp was conducted at the Observatoire de Haute Provence from August 1996 to April 1997. Narrow band images were obtained from the 120 cm telesco...

    CÉLINE LAFFONT, P. ROUSSELOT, J. CLAIREMIDI, G. MOREELS… in Earth, Moon, and Planets (1997)

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  3. No Access

    Chapter and Conference Paper

    Spectroscopic Evidence of Organic Molecules Released by the Dust of Halley’s Inner Coma

    New spectroscopic arguments supporting the probable presence of organic molecules in the material released by comet Halley are deduced from the data obtained by the Vega three-channel spectrometer. Two excesse...

    J. Clairemidi, P. Rousselot, G. Moreels in Origin and Evolution of Interplanetary Dust (1991)

  4. No Access

    Chapter and Conference Paper

    Spatial Distribution and Color of Dust in Halley’s Inner Coma

    Composite images of the intensity of solar radiation scattered by dust in Halley’s coma are constructed by using the three-channel spectra obtained during the approach phase of the Vega 2 spacecraft They cover...

    J. Clairemidi, E. Brandon, P. Rousselot… in Origin and Evolution of Interplanetary Dust (1991)

  5. No Access

    Chapter and Conference Paper

    Properties of dust in comet P/Halley measured by the Vega-2 three-channel spectrometer

    Optical properties of cometary dust exhibit no substantial variations at distances from 100 to 15 000 km from the nucleus. Dust ejection can be approximated by cos φ where φ is the angle with the sun-nucleus axis...

    V. A. Krasnopolsky, V. I. Moroz, A. A. Krysko… in Exploration of Halley’s Comet (1988)

  6. No Access

    Chapter and Conference Paper

    Spectrophotometry of comet P/Halley at wavelengths 275—710 nm from Vega 2

    Spectrophotometric observations of the inner coma of comet Halley in the range 275-710 nm were conducted from Vega 2 on March 8, 9, 10, 11, 1986. During the encounter session, when the impact parameter was min...

    G. Moreels, J. Clairemidi, J. P. Parisot, J. M. Zucconi… in Exploration of Halley’s Comet (1988)

  7. No Access

    Chapter and Conference Paper

    Infrared Observation of Non Thermal Emissions from Spacelab

    Observations of the emissions of atmospheric ozone and nitric acid in the 10 μm window have already been used for the monitoring of these constituents in the stratosphere. We propose to generalise these method...

    G. Moreels, C. Muller in Atmospheric Physics from Spacelab (1976)