Extreme Ultraviolet Variability Experiment (EVE) on the Solar Dynamics Observatory (SDO): Overview of Science Objectives, Instrument Design, Data Products, and Model Developments

Woods, Thomas N.; Eparvier, F. G.; Hock, R. A.; Jones, A. R.; Woodraska, D.; Judge, D. L.; Didkovsky, L. V.; Lean, J.; Mariska, J. T.; Warren, H. P.; McMullin, D.; Chamberlin, Phillip C.; Berthiaume, Gregory D.; Bailey, S. M.; Fuller‐Rowell, T. J.; Sojka, J. J.; Tobiska, W. Kent; Viereck, R. A.

doi:10.1007/978-1-4614-3673-7_7

Cited by 53 publications

(58 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Full‐disk measurements of the solar EUV irradiance could be used to quantify changes between solar minima. Space‐based observations include the Solar EUV Monitor (SEM) [ Judge et al ., ] on the Solar and Heliospheric Observatory (SOHO), the Solar EUV Experiment (SEE) on the Thermosphere‐Ionosphere‐Mesosphere Energetics and Dynamics (TIMED) satellite, [ Woods et al ., ] the EUV Variability Experiment (EVE) on the Solar Dynamics Observatory [ Woods et al ., ], and several suborbital rocket flights used to calibrate these instruments. Soft X‐ray measurements were made by the Student Nitric Oxide Explorer (SNOE) [ Bailey et al ., ; Solomon et al ., ] by the Solar Radiation and Climate Experiment (SORCE) [ Woods and Rottman , ].…”

Section: Data Sourcesmentioning

confidence: 99%

The anomalous ionosphere between solar cycles 23 and 24

2013

View full text Add to dashboard Cite

[1] The solar minimum period during [2008][2009] was characterized by lower thermospheric density than the previous solar minimum and lower than any previously measured. Recent work used the NCAR Thermosphere-Ionosphere-Electrodynamics General Circulation Model to show that the primary cause of density changes from 1996 to 2008 was a small reduction in solar extreme ultraviolet (EUV) irradiance, causing a decrease in thermospheric temperature and hence a contracted thermosphere. There are similar effects in the ionosphere, with most measurements showing an F region ionosphere that is unusually low in density, and in peak altitude. This paper addresses the question of whether model simulations previously conducted, and their solar, geomagnetic, and anthropogenic inputs, produce ionospheric changes commensurate with observations. We conducted a 15 year model run and obtained good agreement with observations of the global mean thermospheric density at 400 km throughout the solar cycle, with a reduction of~30% from the 1996 solar minimum to [2008][2009]. We then compared ionosonde measurements of the midday peak density of the ionospheric F region (N m F 2 ) to the model simulations at various locations. Reasonable agreement was obtained between measurements and the model, supporting the validity of the neutral density comparisons. The global average N m F 2 was estimated to have declined between the two solar minima by~15%. In these simulations, a 10% reduction of solar EUV plays the largest role in causing the ionospheric change, with a minor contribution from lower geomagnetic activity and a very small additional effect from anthropogenic increase in CO 2 .

show abstract

Section: Data Sourcesmentioning

confidence: 99%

The anomalous ionosphere between solar cycles 23 and 24

2013

View full text Add to dashboard Cite

show abstract

“…The Solar Dynamics Observatory / Extreme Ultraviolet Variability Experiment (SDO/EVE: Woods et al, 2012; are solar EUV spectrometers, which show degradation of the EUV signal due to various mechanisms.…”

Section: Sdo/eve Instrument Degradationmentioning

confidence: 99%

On-Orbit Degradation of Solar Instruments

et al. 2013

Self Cite

View full text Add to dashboard Cite

We present the lessons learned about the degradation observed in several space solar missions, based on contributions at the Workshop about OnOrbit Degradation of Solar and Space Weather Instruments that took place at the Solar Terrestrial Centre of Excellence (Royal Observatory of Belgium) in Brussels on 3 May 2012. The aim of this workshop was to open discussions related to the degradation observed in Sun-observing instruments exposed to the effects of the space environment. This article summarizes the various lessons learned and offers recommendations to reduce or correct expected degradation with the goal of increasing the useful lifespan of future and ongoing space missions.

show abstract

“…The consequences are that large‐scale models that rely on the irradiance models considered here, including the data driven FISM model, systematically underestimate the variation of nitric oxide production over solar rotation time scales. The new solar irradiance measurements from the higher temporal cadence and higher spectral resolution Extreme Ultraviolet Variability Experiment (EVE) on the Solar Dynamics Observatory (SDO) [ Woods et al , 2010] appear promising to resolve some of these differences in the photoelectron comparisons for the shorter wavelengths; however, SDO EVE observations did not start until 2010 and thus do not overlap with these photoelectron measurements.…”

Section: Discussionmentioning

confidence: 99%

“…There is no complete spectral coverage of the region below 27 nm for the time interval of interest. Systematic high‐resolution (0.1–1 nm) solar irradiance data from 6 to 27 nm only became available with the launch of the EUV Variability Experiment (EVE) on the Solar Dynamics Observatory (SDO) in February 2010 [ Woods et al , 2010].…”

Section: Solar Irradiance Observations and Modelsmentioning

confidence: 99%

“…There has been continual improvement in both the spectral and temporal resolution of solar irradiance observations over the years, but only since the launch of NASA's Solar Dynamics Observatory (SDO) have the high temporal, high spectral resolution observations of solar irradiance at wavelengths between ∼1 and ∼100 nm necessary for aeronomic calculations become available [ Woods et al , 2010]. To fill the historical spectral and temporal gaps in our knowledge of solar EUV and XUV observations, empirical, first principles, and observation driven solar irradiance models have been developed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Solar EUV and XUV energy input to thermosphere on solar rotation time scales derived from photoelectron observations

Peterson¹,

Woods²,

Fontenla³

et al. 2012

J. Geophys. Res.

Self Cite

View full text Add to dashboard Cite

[1] Solar radiation below $100 nm produces photoelectrons, a substantial portion of the F region ionization, most of the E region ionization, and drives chemical reactions in the thermosphere. Unquantified uncertainties in thermospheric models exist because of uncertainties in solar irradiance models used to fill spectral and temporal gaps in solar irradiance observations. We investigate uncertainties in solar energy input to the thermosphere on solar rotation time scales using photoelectron observations from the FAST satellite. We compare observed and modeled photoelectron energy spectra using two photoelectron production codes driven by five different solar irradiance models. We observe about 1.7% of the ionizing solar irradiance power in the escaping photoelectron flux. Most of the code/model pairs used reproduce the average escaping photoelectron flux over a 109-day interval in late 2006. The code/model pairs we used do not completely reproduce the observed spectral and solar rotation variations in photoelectron power density. For the interval examined, 30% of the variability in photoelectron power density with equivalent wavelengths between 18 and 45 nm was not captured in the code/model pairs. For equivalent wavelengths below $16 nm, most of the variability was missed. This result implies that thermospheric model runs based on the solar irradiance models we tested systematically underestimate the energy input from ionizing radiation on solar rotation time scales.

show abstract

Extreme Ultraviolet Variability Experiment (EVE) on the Solar Dynamics Observatory (SDO): Overview of Science Objectives, Instrument Design, Data Products, and Model Developments

Cited by 53 publications

References 56 publications

The anomalous ionosphere between solar cycles 23 and 24

The anomalous ionosphere between solar cycles 23 and 24

On-Orbit Degradation of Solar Instruments

Solar EUV and XUV energy input to thermosphere on solar rotation time scales derived from photoelectron observations

Contact Info

Product

Resources

About