Prof. John Leonard Culhane Profile

Prof. John Leonard Culhane

Director at Univ College London

SPIE Involvement:

Author

Proceedings Article | 13 June 2006 Paper

The extreme UV imaging spectrometer for the JAXA Solar-B mission

J. Culhane, G. Doschek, T. Watanabe, A. Smith, C. Brown, H. Hara, L. Harra, A. James, K. al Janabi, B. Kent, C. Korendyke, J. Lang, J. Mariska, S. Myers, J. Seely, G. Simnett, J. Tandy, R. Thomas, D. Windt

Proceedings Volume 6266, 62660T (2006) https://doi.org/10.1117/12.671262

KEYWORDS: Iron, Photons, Mirrors, Raster graphics, Spectroscopy, Charge-coupled devices, Plasma, Calibration, Space operations, Sun

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Proceedings Article | 24 February 2003 Paper

Joint Astrophysical plasmadynamic experiment (J-PEX): a high resolution rocket spectrometer

Martin Barstow, Nigel Bannister, Raymond Cruddace, Michael Kowalski, Kent Wood, Daryl Yentis, Herbert Gursky, Troy Barbee, William Goldstein, Joseph Kordas, Gilbert Fritz, J. Leonard Culhane, Jonathan Lapington

Proceedings Volume 4854, (2003) https://doi.org/10.1117/12.459810

KEYWORDS: Spectroscopy, Extreme ultraviolet, Microchannel plates, Sensors, Spectral resolution, Stars, Rockets, Absorption, Data modeling, Calibration

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Proceedings Article | 24 February 2003 Paper

Astrophysical Plasmadynamic Explorer (APEX): a high-resolution spectroscopic observatory

Michael Kowalski, Raymond Cruddace, Kent Wood, Daryl Yentis, Herbert Gursky, Troy Barbee, William Goldstein, Joseph Kordas, Gilbert Fritz, William Hunter, Martin Barstow, Nigel Bannister, J. Leonard Culhane, Jonathan Lapington

Proceedings Volume 4854, (2003) https://doi.org/10.1117/12.459808

KEYWORDS: Spectroscopy, Sensors, Extreme ultraviolet, Spectral resolution, Microchannel plates, Multilayers, Stars, Absorption, Diffraction gratings, Plasmas

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Proceedings Article | 18 December 2000 Paper

Extreme-ultraviolet imaging spectrometer designed for the Japanese Solar-B satellite

J. Leonard Culhane, Clarence Korendyke, Tetsuya Watanabe, George Doschek

Proceedings Volume 4139, (2000) https://doi.org/10.1117/12.410529

KEYWORDS: Spectroscopy, Extreme ultraviolet, Electrophoretic light scattering, Iron, Magnetism, Sun, Plasma, Telescopes, Charge-coupled devices, Spatial resolution

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The Extreme-ultraviolet Imaging Spectrometer combines, for the first time, high spectral, spatial and temporal resolution in a satellite based, solar extreme ultraviolet instrument. The instrument optical design consists of a multilayer-coated off- axis paraboloid mirror telescope followed by a toroidal grating spectrometer. The instrument includes thin film aluminum filters to reject longer wavelength solar radiation and employs CCD detectors at the focal plane. The telescope mirror is articulated to allow sampling of a large fraction of the solar surface from a single spacecraft pointing position. Monochromatic images are obtained either by rastering the solar image across the narrow entrance slit or by using a wide slit or slot in place of the slit. Monochromatic images of the region centered on the slot are obtained in a single exposure. Half of each optic is coated to maximize reflectance at 195 angstrom; the other half is coated to maximize reflectance at 270 angstrom. The two EUV wavelength bands were selected to optimize spectroscopic plasma diagnostic capabilities. Particular care was taken to choose wavelength ranges with relatively bright emission lines to obtain precision line of sight and turbulent bulk plasma velocity measurements from observed line profiles. The EIS spectral range contains emission lines formed over a temperature range from approximately 10⁵ - 10⁷ K. The wavelength coverage also includes several density sensitive emission line pairs. These line pairs provide spatial resolution independent density diagnostics at nominal coronal temperatures and densities. Each wavelength band is imaged onto a separate CCD detector. The main EIS instrument characteristics are: wavelength bands -- 180 - 204 angstrom and 250 - 290 angstrom; spectral resolution -- 0.0223 angstrom/pixel (23 - 34 km/second-pixel); slit dimensions -- 4 slits: 1 X 1024 arc- seconds and 50 X 1024 arc-seconds with two positions unspecified as of this writing; fine raster range -- >6 arc-minutes on the sun; coarse raster range -- > 1600 arc- seconds on the sun; largest spatial field of view in a single exposure -- 50 X 1024 arc-seconds; nominal time resolution for active region velocity studies -- 3.4s. The Solar-B satellite is scheduled for launch in August 2005 into a nominal 600 km sun-synchronous orbit.

Proceedings Article | 16 October 1995 Paper

Coronal Diagnostic Spectrometer: an extreme-ultraviolet spectrometer for the Solar and Heliospheric Observatory

Barry Kent, Richard Harrison, Eric Sawyer, R. Hayes, Anthony Richards, J. Leonard Culhane, K. Norman, A. Breeveld, P. Thomas, Arthur Poland, Roger Thomas, William Thompson, Bernd Aschenbach, Heinrich Braeuninger, O. Kjeldseth-Moe, Mikhael Kuehne, Joerg Hollandt, W. Paustian, B. Bromage

Proceedings Volume 2517, (1995) https://doi.org/10.1117/12.224918

KEYWORDS: Spectroscopy, Diagnostics, Solar processes, Extreme ultraviolet, Cadmium sulfide, Observatories, Plasmas, Spectrometer engineering, Spatial resolution, Temporal resolution

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SPIE Conference Volume | 14 July 1986

X-Ray Instrumentation in Astronomy

Conference Committee Involvement (1)

X-Ray Instrumentation in Astronomy

25 November 1985 | Cannes, France

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