A novel forward-model technique for estimating EUV imaging performance: design and analysis of the SUVI telescope

Martinez-Galarce, D.; Harvey, James E.; Bruner, M. E.; Lemen, J. R.; Gullikson, Eric M.; Soufli, Régina; Prast, Evan; Khatri, Shayna

doi:10.1117/12.864577

Cited by 26 publications

(14 citation statements)

References 25 publications

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“…One imager that might be able to help close the observation gap, however, is the Solar Ultraviolet Imager (SUVI; Martinez- Galarce et al 2010Galarce et al , 2013) launched on 2016 November 19 on the joint NOAA-NASA GOES-R series of spacecraft. SUVI will bring together six 131,171,195,284, and 304Å-with an extended field of view similar to SWAP's, and may help make a significant improvement in our ability to study large structures associated with eruptions that are currently unobservable.…”

Section: Discussionmentioning

confidence: 99%

Observations of the Formation, Development, and Structure of a Current Sheet in an Eruptive Solar Flare

Seaton¹,

Bartz²,

Darnel³

2017

ApJ

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We present Atmospheric Imaging Assembly observations of a structure we interpret as a current sheet associated with an X4.9 flare and coronal mass ejection that occurred on 2014February25 in NOAA Active Region 11990. We characterize the properties of the current sheet, finding that the sheet remains on the order of a few thousand kilometers thick for much of the duration of the event and that its temperature generally ranged between 8 and 10 MK. We also note the presence of other phenomena believed to be associated with magnetic reconnection in current sheets, including supra-arcade downflows and shrinking loops. We estimate that the rate of reconnection during the event was M A ≈0.004-0.007, a value consistent with model predictions. We conclude with a discussion of the implications of this event for reconnection-based eruption models.

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Section: Discussionmentioning

confidence: 99%

Observations of the Formation, Development, and Structure of a Current Sheet in an Eruptive Solar Flare

Seaton¹,

Bartz²,

Darnel³

2017

ApJ

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“…Microroughness affects both instrument throughput and imaging performance, but herein we discuss only the mirrors' performance. For further discussion regarding SUVI imaging performance see Martínez-Galarce et al 2010 13 …”

Section: Suvi Designmentioning

confidence: 99%

Microroughness measurements and EUV calibration of the solar ultraviolet imager multilayer-coated mirrors

et al. 2012

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The Solar Ultraviolet Imager (SUVI) is one of several instruments that will fly on board the next generation of Geostationary Operational Environmental Satellites (GOES) -R and -S platforms, as part of NOAA's space weather monitoring fleet. SUVI is a Generalized Cassegrain telescope that employs multilayer-coated optics that operate in six extreme ultraviolet (EUV) narrow bandpasses centered at 93.9, 131.2, 171.1, 195.1, 284.2 and 303.8 Å. Once operational, over the mission lifetime expected to last up to 10 years, SUVI will record full disk, EUV spectroheliograms every few minutes, where this data will be used to better understand the effects of solar produced EUV radiation on Earth and the near-Earth environment. The material presented herein will touch upon general aspects of the SUVI optical design, as well as the fabrication, super polishing and metrology of the fabricated mirrors, including measured EUV spectral performance.

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“…The SUVI optical system employs a generalized Cassegrain telescope consisting of multilayer coated optics, and a CCD detector to record images of the solar disk and corona in the extreme ultraviolet (EUV) and soft x-ray regions of the spectrum. 0 In Figure 1 we show a representative sample of spectroheliograms recorded by the extreme ultraviolet imaging telescope (EIT) on board the solar and heliospheric observatory (SOHO) that are similar in quality to the images which SUVI will return during its operational lifetime [1]. Figure 1.…”

Section: Introductionmentioning

confidence: 98%

“…And when these conditions develop, they are able to monitor storm development and track their movements. GOES are one of two types of satellites that NOAA uses for weather monitoring, and particularly, GOES serve as the short-range warning system to alert NOAA's National Weather Service of impending severe weather conditions [1].…”

Section: Introductionmentioning

confidence: 99%

Effect of surface scatter upon the MTF of the solar ultra violet imager (SUVI) telescope

Harvey¹,

Choi

2013

Solar Physics and Space Weather Instrumentation V

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The solar UV imager (SUVI) is an extreme ultraviolet instrument that will fly on the Geostationary Operational Environmental Satellite (GOES)-R and-S platforms, as part of NOAA's space weather monitoring fleet. It will provide important information on solar activity and the effects of the Sun on the earth and the near-earth environment. This instrument will image the full solar disc in 6 EUV wavebands between 303.8 Å and 93.9 Å. A generalized Cassegrain telescope configuration is employed where six mirror sectors utilize multilayer coatings optimized for the six wavelengths of interest. An aperture shutter is used to select the appropriate sector for observations at a particular wavelength. A thinned, back-illuminated CCD sensor with 21m (2.5 arcsec) pixels resides in the telescope focal plane. The modulation transfer function (MTF) is usually considered to be the image quality criterion of choice for applications where fine detail in extended images needs to be specified or evaluated. However, the contractual image quality requirement was specified in terms of fractional ensquared energy for a variety of different wavelengths and square sizes. In this paper we will calculate and present MTF plots (as degraded by diffraction, geometrical aberrations, surface scatter effects and detector effects) for each of the SUVI wavelengths of interest. Surface scatter due to residual optical fabrication errors is a major factor limiting the performance at the shorter wavelengths, and the large detector size severely limits the performance at all SUVI wavelengths.

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A novel forward-model technique for estimating EUV imaging performance: design and analysis of the SUVI telescope

Cited by 26 publications

References 25 publications

Observations of the Formation, Development, and Structure of a Current Sheet in an Eruptive Solar Flare

Observations of the Formation, Development, and Structure of a Current Sheet in an Eruptive Solar Flare

Microroughness measurements and EUV calibration of the solar ultraviolet imager multilayer-coated mirrors

Effect of surface scatter upon the MTF of the solar ultra violet imager (SUVI) telescope

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