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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/23501
Title: Probing the Solar Wind Acceleration Region with the Sun-grazing Comet C/2002 S2
Authors: GIORDANO, Silvio Matteo 
Raymond, J. C.
Lamy, P.
Uzzo, M.
Dobrzycka, D.
Issue Date: 2015
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 798
Issue: 1
First Page: 47
Abstract: Comet C/2002 S2, a member of the Kreutz family of sungrazing comets, was discovered in white-light images of the Large Angle and Spectromeric Coronagraph Experiment coronagraph on the Solar and Heliospheric Observatory (SOHO) on 2002 September 18 and observed in H I Lyα emission by the SOHO Ultraviolet Coronagraph Spectrometer (UVCS) instrument at four different heights as it approached the Sun. The H I Lyα line profiles detected by UVCS are analyzed to determine the spectral parameters: line intensity, width, and Doppler shift with respect to the coronal background. Two-dimensional comet images of these parameters are reconstructed at the different heights. A novel aspect of the observations of this sungrazing comet data is that, whereas the emission from most of the tail is blueshifted, that along one edge of the tail is redshifted. We attribute these shifts to a combination of solar wind speed and interaction with the magnetic field. In order to use the comet to probe the density, temperature, and speed of the corona and solar wind through which it passes, as well as to determine the outgassing rate of the comet, we develop a Monte Carlo simulation of the H I Lyα emission of a comet moving through a coronal plasma. From the outgassing rate, we estimate a nucleus diameter of about 9 m. This rate steadily increases as the comet approaches the Sun, while the optical brightness decreases by more than a factor of 10 and suddenly recovers. This indicates that the optical brightness is determined by the lifetimes of the grains, sodium atoms, and molecules produced by the comet.
URI: http://hdl.handle.net/20.500.12386/23501
URL: https://iopscience.iop.org/article/10.1088/0004-637X/798/1/47
ISSN: 0004-637X
DOI: 10.1088/0004-637X/798/1/47
Bibcode ADS: 2015ApJ...798...47G
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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