Degradation assessment of LYRA after 5 years on orbit - Technology Demonstration -

BenMoussa, A.; Giordanengo, B.; Gissot, S.; Dammasch, I. E.; Dominique, Marie; Hochedez, J.‐F.; Soltani, A.; Bourzgui, N.E.; Saito, T.; Schühle, U.; Gottwald, Alexander; Kroth, U.; Jones, A. R.

doi:10.1007/s10686-014-9437-7

Cited by 11 publications

(3 citation statements)

References 25 publications

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“…The full solar spectrum cannot be measured from the ground, since the solar EUV radiation, among others, is absorbed in the upper atmosphere. Direct measurement of EUV radiation is possible from space, but the problem of on orbit solar instrument degradation is a challenge (e.g., BenMoussa et al., 2015). However, there are several solar proxies that are available over long periods of time.…”

Section: Resultsmentioning

confidence: 99%

Ionospheric Response to Solar EUV Radiation Variations Using GOLD Observations and the CTIPe Model

Vaishnav,

Jacobi,

Berdermann

et al. 2023

JGR Space Physics

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To understand the global response of thermospheric‐ionospheric (TI) parameters to variations in solar irradiance measurements from the Global‐Scale Observations of the Limb and Disk (GOLD) ultraviolet imaging spectrograph, solar radio flux F10.7, predictions from the Coupled Thermosphere Ionosphere Plasmasphere electrodynamics (CTIPe) model, and International Global Navigation Satellite System Service total electron content maps (TEC) have been used. Various parameters such as GOLD O/N2, O2, and the nighttime peak electron density (Nmax) have been compared with the CTIPe model simulations. The GOLD observed Nmax shows a number of significant features including a winter anomaly and an equatorial ionization anomaly. The comparison with solar proxies showed that the GOLD QEUV correlates very well with the EUV observations compared to the F10.7 index. The study also examined the relationship between the solar proxies and Nmax on different time scales and found that Nmax responded significantly to QEUV at both medium‐ and long‐term timescales. Furthermore, a low correlation between Nmax in the equatorial region and solar proxies was found. A delayed ionospheric TEC response against solar flux variations within the 27‐day solar rotation was investigated. This ionospheric delay of TEC with respect to solar flux was observed to be less than 1 day, which was reproduced in model simulations. The current study has shown that the GOLD observations can be used to investigate the delayed ionospheric response and to gain a better understanding of the influence of solar activity on the TI system.

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Section: Resultsmentioning

confidence: 99%

Ionospheric Response to Solar EUV Radiation Variations Using GOLD Observations and the CTIPe Model

Vaishnav,

Jacobi,

Berdermann

et al. 2023

JGR Space Physics

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“…Moreover, 66 http://solspec.projet.latmos.ipsl.fr/SOLSPEC_GB/Home.html. the use of novel materials, such as wide-bandgap semiconductors, enhances the robustness of detectors against proton radiation (BenMoussa et al 2015).…”

Section: The Solar Instruments On Issmentioning

confidence: 99%

Spectroradiometry with space telescopes

Pauluhn

Huber

Smith

et al. 2015

Astron Astrophys Rev

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Radiometry, i.e. measuring the power of electromagnetic radiationhitherto often referred to as "photometry"-is of fundamental importance in astronomy. We provide an overview of how to achieve a valid laboratory calibration of space telescopes and discuss ways to reliably extend this calibration to the spectroscopic telescope's performance in space. A lot of effort has been, and still is going into radiometric "calibration" of telescopes once they are in space; these methods use celestial primary and transfer standards and are based in part on stellar models. The history of the calibration of the Hubble Space Telescope serves as a platform to review these methods. However, we insist that a true calibration of spectroscopic space telescopes must directly be based on and traceable to laboratory standards, and thus be independent of the observations. This has recently become a well-supported aim, following the discovery of the acceleration of the cosmic expansion by use of type-Ia supernovae, and has led to plans for launching calibration rockets for the visible and infrared spectral range. This is timely, too, because an adequate exploitation of data from present space missions, such as Gaia, and from many current astronomical projects like Euclid and WFIRST demands higher radiometric accuracy than is generally available today. A survey of the calibration of instruments observing from the X-ray to the infrared spectral domains that include instrument-or mission-specific estimates of radiometric accuracies rounds off this review.

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“…66 All irradiance measurements in the UV range point out the importance of rigorous cleanliness and contamination control at instrument and spacecraft levels. Moreover, the use of novel materials, such as wide-bandgap semiconductors enhances the robustness of detectors against proton radiation (BenMoussa et al 2015).…”

Section: The Solar Instruments On Issmentioning

confidence: 99%

Spectroradiometry with Space Telescopes

Pauluhn,

Huber,

Smith

et al. 2015

Preprint

View full text Add to dashboard Cite

Radiometry, i.e., measuring the power of electromagnetic radiation -hitherto often referred to as "photometry" -is of fundamental importance in astronomy. We provide an overview of how to achieve a valid laboratory calibration of space telescopes and discuss ways to reliably extend this calibration to the spectroscopic telescope's performance in space. A lot of effort has been, and still is going into radiometric "calibration" of telescopes once they are in space; these methods use celestial primary and transfer standards and are based in part on stellar models. The history of the calibration of the Hubble Space Telescope serves as a platform to review these methods. However, we insist that a true calibration of spectroscopic space telescopes must directly be based on and traceable to laboratory standards, and thus be independent of the observations.

show abstract

Degradation assessment of LYRA after 5 years on orbit - Technology Demonstration -

Cited by 11 publications

References 25 publications

Ionospheric Response to Solar EUV Radiation Variations Using GOLD Observations and the CTIPe Model

Ionospheric Response to Solar EUV Radiation Variations Using GOLD Observations and the CTIPe Model

Spectroradiometry with space telescopes

Spectroradiometry with Space Telescopes

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