The LYRA Instrument Onboard PROBA2: Description and In-Flight Performance

Dominique, Marie; Hochedez, Jean-François; Schmutz, W.; Dammasch, I. E.; Шапиро, А. И.; Kretzschmar, M.; Zhukov, A. N.; Gillotay, D.; Stockman, Yvan; BenMoussa, A.

doi:10.1007/978-1-4614-8187-4_3

Cited by 15 publications

(11 citation statements)

References 26 publications

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“…To analyze the correlation of the noise attenuation with various solar radiation lines, we carried out a joint analysis of the absorption during the 80 flares of 2013–2017 and data from varied instruments, namely: GOES/XRS (Hanser & Sellers, ; Machol & Viereck, ), GOES/EUVS (Machol et al, ), SDO/AIA (Lemen et al, ), PROBA2/LYRA (Dominique et al, ; Hochedez et al, ), SOHO/SEM (Didkovsky et al, ), and SDO/EVE(ESP; Didkovsky et al, ). These instruments provide direct and regular observations of solar radiation in the wavelength range 1–2,500 Å during the period under study (see Table S2 in the supporting information for details).…”

Section: Correlation Of Absorption Dynamics With Solar Radiation Of Dmentioning

confidence: 99%

Global Diagnostics of Ionospheric Absorption During X‐Ray Solar Flares Based on 8‐ to 20‐MHz Noise Measured by Over‐the‐Horizon Radars

et al. 2019

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An analysis of noise attenuation during 80 solar flares between 2013 and 2017 was carried out at frequencies 8–20 MHz using 34 Super Dual Auroral Radar Network radars and the EKB ISTP SB RAS radar. The attenuation was determined on the basis of noise measurements performed by the radars during the intervals between transmitting periods. The location of the primary contributing ground sources of noise was found by consideration of the propagation paths of radar backscatter from the ground. The elevation angle for the ground echoes was determined through a new empirical model. It was used to determine the paths of the noise and the location of its source. The method was particularly well suited for daytime situations, which had to be limited for the most part to only two crossings through the D region. Knowing the radio path was used to determine an equivalent vertical propagation attenuation factor. The change in the noise during solar flares was correlated with solar radiation lines measured by GOES/XRS, GOES/EUVS, SDO/AIA, SDO/EVE, SOHO/SEM, and PROBA2/LYRA instruments. Radiation in the 1 to 8 Å and near 100 Å are shown to be primarily responsible for the increase in the radionoise absorption, and by inference, for an increase in the D and E region density. The data are also shown to be consistent with a radar frequency dependence having a power law with an exponent of −1.6. This study shows that a new data set can be made available to study D and E regions.

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Section: Correlation Of Absorption Dynamics With Solar Radiation Of Dmentioning

confidence: 99%

Global Diagnostics of Ionospheric Absorption During X‐Ray Solar Flares Based on 8‐ to 20‐MHz Noise Measured by Over‐the‐Horizon Radars

et al. 2019

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“…In this paper, new 150 to 400 km thermospheric density profiles are presented that were observed over the winter hemisphere by the 1–20 nm Zr channel of the solar observing Large Yield Radiometer (LYRA) instrument (Dominique et al, ; Hochedez et al, ) on the European Space Agency (ESA) PROBA2 satellite (Santandrea et al, ) between 2010 and 2017. It is shown that full‐disk solar irradiance measurements from the Zr channel are suitable for measuring the summed O and N 2 number density at approximately 5 km resolution to within 15% absolute accuracy.…”

Section: Introductionmentioning

confidence: 99%

Vertical Thermospheric Density Profiles From EUV Solar Occultations Made by PROBA2 LYRA for Solar Cycle 24

et al. 2017

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A new data set of summed neutral N2 and O number density profiles, spanning altitudes between 150 and 400 km, and observed during Northern Winter from 2010 to 2016 is presented. The neutral density profiles are derived from solar occultation measurements made by the 0.1–20 nm Zr channel on the Large Yield Radiometer (LYRA) instrument on board Project for Onboard Autonomy 2 (PROBA2). The climatology derived from the vertical profiles is consistent with that predicted by the NRLMSISE‐00 model, and the systematic error and random uncertainty of the measurements are less than 13% and 6%, respectively. The density profiles are used to characterize the response of thermospheric density to solar EUV irradiance variability. Peak correlation coefficients between neutral density and EUV irradiance occur near 300 km at the dusk terminator and 220 km at the dawn terminator. Density variability is higher at dawn than it is at dusk, and temperature variability increases with increasing altitude at both terminators.

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“…Therefore, it is essential that instruments either measure the identical range (for continuity) or have sufficient resolution to accurately reconstruct it. This requirement excludes certain instruments for thermosphere modeling purposes (e.g., the Large Yield Radiometer, Dominique et al, , aboard the PROBA2 spacecraft). A crucial disadvantage of satellite EUV measurements and therefore also He II‐based proxies is, besides calibration and cross‐calibration issues due to different instruments, that the main composition measurements we have were taken by Dynamics Explorer 2 in the early 1980s and the Atmosphere Explorer (AE‐C, AE‐D, and AE‐E) in the 1970s.…”

Section: Euv Irradiance and Its Proxiesmentioning

confidence: 99%

EUV Irradiance Inputs to Thermospheric Density Models: Open Issues and Path Forward

Vourlidas

Bruinsma²

2018

Space Weather

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One of the objectives of the NASA Living With a Star Institute on “Nowcasting of Atmospheric Drag for low Earth orbit (LEO) Spacecraft” was to investigate whether and how to increase the accuracy of atmospheric drag models by improving the quality of the solar forcing inputs, namely, extreme ultraviolet (EUV) irradiance information. In this focused review, we examine the status of and issues with EUV measurements and proxies, discuss recent promising developments, and suggest a number of ways to improve the reliability, availability, and forecast accuracy of EUV measurements in the next solar cycle.

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The LYRA Instrument Onboard PROBA2: Description and In-Flight Performance

Cited by 15 publications

References 26 publications

Global Diagnostics of Ionospheric Absorption During X‐Ray Solar Flares Based on 8‐ to 20‐MHz Noise Measured by Over‐the‐Horizon Radars

Global Diagnostics of Ionospheric Absorption During X‐Ray Solar Flares Based on 8‐ to 20‐MHz Noise Measured by Over‐the‐Horizon Radars

Vertical Thermospheric Density Profiles From EUV Solar Occultations Made by PROBA2 LYRA for Solar Cycle 24

EUV Irradiance Inputs to Thermospheric Density Models: Open Issues and Path Forward

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