CELIAS - Charge, Element and Isotope Analysis System for SOHO

Hovestadt, D.; Hilchenbach, M.; Bürgi, A.; Klecker, B.; Laeverenz, P.; Scholer, M.; Grünwaldt, H.; Axford, W. I.; Livi, S.; Marsch, E.; Wilken, B.; Winterhoff, H. P.; Ipavich, F. M.; Bedini, Peter D.; Coplan, M. A.; Galvin, A. B.; Gloeckler, G.; Bochsler, P.; Balsiger, H.; Fischer, J.; Geiss, J.; Kallenbach, R.; Würz, Peter; Reiche, K.-U.; Gliem, F.; Judge, D. L.; Ogawa, Hiromitsu; Hsieh, K. C.; Möbius, E.; Lee, M. A.; Managadze, G. G.; Веригин, М. И.; Neugebauer, M.

doi:10.1007/bf00733436

Cited by 266 publications

(60 citation statements)

References 7 publications

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“…We use the Bremen composite 3 , whose record starts on 7 November 1978. -the EUV flux, integrated from 26 to 34 nm, by the Solar EUV Monitor (SEM) radiometer 4 on board SOHO (Hovestadt et al 1995). These data represent the first long-term measurements of EUV irradiance; they are available since 1 January 1996 and are used in the JB2008 drag model ).…”

Section: Comparison With Solar Proxiesmentioning

confidence: 99%

The 30 cm radio flux as a solar proxy for thermosphere density modelling

Wit

Bruinsma²

2017

J. Space Weather Space Clim.

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The 10.7 cm radio flux (F10.7) is widely used as a proxy for solar UV forcing of the upper atmosphere. However, radio emissions at other centimetric wavelengths have been routinely monitored since the 1950 s, thereby offering prospects for building proxies that may be better tailored to space weather needs. Here we advocate the 30 cm flux (F30) as a proxy that is more sensitive than F10.7 to longer wavelengths in the UV and show that it improves the response of the thermospheric density to solar forcing, as modelled with DTM (Drag Temperature Model). In particular, the model bias drops on average by 0-20% when replacing F10.7 by F30; it is also more stable (the standard deviation of the bias is 15-40% smaller) and the density variation at the the solar rotation period is reproduced with a 35-50% smaller error. We compare F30 to other solar proxies and discuss its assets and limitations.

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Section: Comparison With Solar Proxiesmentioning

confidence: 99%

The 30 cm radio flux as a solar proxy for thermosphere density modelling

Wit

Bruinsma²

2017

J. Space Weather Space Clim.

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“…We used the PS longitude defined at the solar-wind source surface (at 2.5 solar radii) that is a function of the solar-wind speed only. For the solar-wind speed we used data from the Proton Monitor (PM: umtof.umd.edu/pm/) part of the Charge, Element, and Isotope Analysis System (CELIAS) instrument onboard SOHO (Hovestadt et al, 1995) averaged over 12 hours before the first particles arrival at the spacecraft.…”

Section: Eastern Sep Eventsmentioning

confidence: 99%

Solar Energetic Particles and Associated EIT Disturbances in Solar Cycle 23

et al. 2014

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We explore the link between solar energetic particles (SEPs) observed at 1 AU and large-scale disturbances propagating in the solar corona, named after the Extreme ultraviolet Imaging Telescope (EIT) as EIT waves, which trace the lateral expansion of a coronal mass ejection (CME). A comprehensive search for SOHO/EIT waves was carried out for 179 SEP events during Solar Cycle 23 (1997 -2006). 87 % of the SEP events were found to be accompanied by EIT waves. In order to test if the EIT waves play a role in the SEP acceleration, we compared their extrapolated arrival time at the footpoint of the Parker spiral with the particle onset in the 26 eastern SEP events that had no direct magnetic connection to the Earth. We find that the onset of proton events was generally consistent with this scenario. However, in a number of cases the first near-relativistic electrons were detected too early. Furthermore, the electrons had in general only weakly anisotropic pitch-angle distributions. This poses a problem for the idea that the SEPs were accelerated by the EIT wave or in any other spatially confined region in the low corona. The presence of weak electron anisotropies in SEP events from the eastern hemisphere suggests that transport processes in interplanetary space, including cross-field diffusion, play a role in giving the SEPs access to a broad range of helio-longitudes.

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“…LASCO (Brueckner et al 1995), which is a set of three coronagraph telescopes used for the observation of the solar corona from 1.1 to 32 solar radii, is used in the present analysis for the detection (onset and evolution) of CMEs attributed to solar flares and sometimes to filament eruptions. CELIAS/SEM (Hovestadt et al 1995) is a spectrometer designed to continuously measure the full solar disk absolute solar flux at the prominent He ii 30.4 nm line as well as the absolute integral flux between 17 and 70 nm, which coincides with its Al filter band-pass. The almost continuous in time CELIAS/SEM data can be used to identify the onset and evolution of SPEs as well as the presence of IP shocks and have been proven very useful for inter-calibration of the EIT instrument (see Fig.…”

Section: Solar Datamentioning

confidence: 99%

Using a new set of space-borne particle monitors to investigate solar-terrestrial relations

Tziotziou

Sandberg

Anastasiadis

et al. 2010

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Context. We investigated the solar origin of Solar Particle Events (SPEs) which occurred during four time periods of the 23rd solar cycle with intense solar activity and were detected by the Standard Radiation Environment Monitor (SREM) onboard the INTEGRAL satellite. SREM is a second generation ESA particle radiation monitor, already flying onboard seven spacecraft. Aims. The present study attempts to establish the association of recorded SPEs by INTEGRAL/SREM with their solar sources and hence evaluate the potential of SREM units as an alarm system for hazardous SPEs. Methods. X-ray, optical and radio data of solar flares and coronal mass ejections (CMEs) that were observed by several space-based instruments during the aforementioned solar cycle were reduced and thoroughly analyzed to establish the corresponding solar origin of the selected SPEs. Conclusions. SREM proves to be a new valuable asset for a comprehensive study of SPEs and a useful alert instrument for explosive geoeffective solar events.

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CELIAS - Charge, Element and Isotope Analysis System for SOHO

Cited by 266 publications

References 7 publications

The 30 cm radio flux as a solar proxy for thermosphere density modelling

The 30 cm radio flux as a solar proxy for thermosphere density modelling

Solar Energetic Particles and Associated EIT Disturbances in Solar Cycle 23

Using a new set of space-borne particle monitors to investigate solar-terrestrial relations

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