The SWAP EUV Imaging Telescope Part I: Instrument Overview and Pre-Flight Testing

Seaton, Daniel B.; Berghmans, D.; Nicula, B.; Halain, Jean-Philippe; Groof, A. De; Thibert, Tanguy; Bloomfield, D. Shaun; Raftery, C. L.; Gallagher, Peter T.; Auchère, F.; Defise, Jean-Marc; D’Huys, Elke; Lecat, Jean-Hervé; Mazy, Emmanuel; Rochus, Pierre; Rossi, Laurence; Schühle, U.; Slemzin, V. A.; Yalim, M. S.; Zender, Joe

doi:10.1007/s11207-012-0114-6

Cited by 126 publications

(64 citation statements)

References 16 publications

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“…In particular, the focus of the PROBA2 mission is the genesis and evolution of events that can affect space weather, such as coronal mass ejections (CMEs), waves and dimmings, solar flares, etc. The Sun Watcher with Active Pixels and Image Processing (SWAP) solar telescope Seaton et al 2013) onboard the PROBA2 spacecraft observes the solar corona in a bandpass near 17.4 nm with a field of view 54 · 54 arcmin, roughly 1.7 solar radii along the image axes and 2.5 solar radii on the diagonals, providing the widest-field images of the Extreme Ultraviolet (EUV) corona available from the Earth's perspective.…”

Section: Uccle Solar Equatorial Table (Uset) Telescopementioning

confidence: 99%

Multi-instrument observations of the solar eclipse on 20 March 2015 and its effects on the ionosphere over Belgium and Europe

Stankov

Bergeot

Berghmans

et al. 2017

J. Space Weather Space Clim.

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A total solar eclipse occurred on 20 March 2015, with a totality path passing mostly above the North Atlantic Ocean, which resulted in a partial solar eclipse over Belgium and large parts of Europe. In anticipation of this event, a dedicated observational campaign was set up at the Belgian Solar-Terrestrial Centre of Excellence (STCE). The objective was to perform high-quality observations of the eclipse and the associated effects on the geospace environment by utilising the advanced space-and ground-based instrumentation available to the STCE in order to further our understanding of these effects, particularly on the ionosphere. The study highlights the crucial importance of taking into account the eclipse geometry when analysing the ionospheric behaviour during eclipses and interpreting the eclipse effects. A detailed review of the eclipse geometry proves that considering the actual obscuration level and solar zenith angle at ionospheric heights is much more important for the analysis than at the commonly referenced Earth's surface or at the plasmaspheric heights. The eclipse occurred during the recovery phase of a strong geomagnetic storm which certainly had an impact on (some of) the ionospheric characteristics and perhaps caused the omission of some ''low-profile'' effects. However, the analysis of the ionosonde measurements, carried out at unprecedented high rates during the eclipse, suggests the occurrence of travelling ionospheric disturbances (TIDs). Also, the high temporal and spatial resolution measurements proved very important in revealing and estimating some finer details of the delay in the ionospheric reaction and the ionospheric disturbances.

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Section: Uccle Solar Equatorial Table (Uset) Telescopementioning

confidence: 99%

Multi-instrument observations of the solar eclipse on 20 March 2015 and its effects on the ionosphere over Belgium and Europe

Stankov

Bergeot

Berghmans

et al. 2017

J. Space Weather Space Clim.

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“…Figure 8a shows solar flare activity observed on t = 2988 days (7 March 2012) by the SWAP EUV telescope on board the PROBA2 spacecraft (http://proba2.oma.be/data/SWAP) [Seaton et al, 2013]. PROBA2 is in a Sun-synchronous Earth orbit.…”

Section: 1002/2015ja021642mentioning

confidence: 99%

Planetary period oscillations in Saturn's magnetosphere: Examining the relationship between abrupt changes in behavior and solar wind‐induced magnetospheric compressions and expansions

et al. 2015

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We examine planetary period oscillations (PPOs) observed in Saturn's magnetospheric magnetic field data from the time of Saturn's equinox in 2009. In particular, we focus on the time period commencing February 2011, when the oscillations started to display sudden and unexpected changes in behavior at ~100–200 day intervals. These were characterized by large simultaneous changes in the amplitude of the northern and southern PPO systems, together with small changes in period and jumps in phase. Nine significant abrupt changes have been observed in the postequinox interval to date, commencing as the Sun started to emerge from a long extended solar minimum. We perform a statistical study to determine whether these modulations in PPO behavior were associated with changes in the solar and/or upstream solar wind conditions. We report that the upstream solar wind conditions show elevated values of solar wind dynamic pressure and density around the time of PPO behavioral transitions, as opposed to before and after these times. We suggest that abrupt changes in PPO behavior may be related to significant changes in the size of the Saturnian magnetosphere in response to varying solar wind conditions.

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“…After almost 5 years in orbit, the 8 VFCs show good stability with time the spatial resolution of SWAP on PROBA2 complements well the high temporal resolution of the EUV LYRA channels [23]. SWAP-the Sun Watcher using APS and image Processing-is an EUV solar telescope centered at 17.4 nm and the first on orbit that benefits from CMOS Active Pixel Sensor technology [24,25]. The long-term variations of the EUV irradiance measured by LYRA are also compared with the EUV Variability Experiment (EVE) on board the Solar Dynamics Observatory (SDO) satellite [26].…”

Section: Exploitation Of the Redundancy Conceptmentioning

confidence: 84%

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

BenMoussa¹,

Giordanengo²,

Gissot³

et al. 2015

Exp Astron

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We present a long-term assessment of the radiometric calibration and degradation of the Large Yield Radiometer (LYRA), which has been on orbit since 2009. LYRA is an ultraviolet (UV) solar radiometer and is the first space experiment using aboard a pioneering diamond detector technology. We show that LYRA has degraded after the commissioning phase but is still exploitable scientifically after almost 5 years on orbit thanks to its redundancy design and calibration strategy correcting for instrument degradation. We focus on the inflight detector's calibration and show that diamond photodetectors have not degraded while silicon reference photodiodes that are even less exposed to the Sun show an increase of their dark current and a decrease of their photoresponse.

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The SWAP EUV Imaging Telescope Part I: Instrument Overview and Pre-Flight Testing

Cited by 126 publications

References 16 publications

Multi-instrument observations of the solar eclipse on 20 March 2015 and its effects on the ionosphere over Belgium and Europe

Multi-instrument observations of the solar eclipse on 20 March 2015 and its effects on the ionosphere over Belgium and Europe

Planetary period oscillations in Saturn's magnetosphere: Examining the relationship between abrupt changes in behavior and solar wind‐induced magnetospheric compressions and expansions

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

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