New developments in SOLAR2000 for space research and operations

Tobiska, W. Kent; Bouwer, S. Dave

doi:10.1016/j.asr.2005.08.015

Cited by 66 publications

(61 citation statements)

References 37 publications

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“…Section 5 describes in more detail the plans to update the physics-based NRLEUV model (Warren, Mariska, and Lean, 2001), the empirical Flare Irradiance Spectral Model (FISM) Eparvier, 2007, 2008), and the hybrid Solar Irradiance Platform (SIP) system (Tobiska, , 2008Tobiska and Bouwer, 2006;Tobiska et al, 2000). Physics-based models provide more insight into the causes of the solar variability and better links to the solar image results.…”

Section: Eve Objective 2 -Understand Why Solar Euv Irradiance Variesmentioning

confidence: 99%

“…They will assist in transitioning EVE research to operations. In particular, EVE data will be used to improve, validate, or constrain solar irradiance models, such as SIP (Tobiska, , 2008Tobiska and Bouwer, 2006;Tobiska et al, 2000), and atmospheric models, such as CTIPe , Global Assimilation of Ionospheric Measurements (GAIM; Schunk et al, 2004), NRLMSIS , JB2006 (Bowman et al, 2008a), JB2008 (Bowman et al, 2008b), and a newly developed improved density specification model that takes into account an extensive density database and includes direct formulation with the Mg index (Emmert, Picone, and Meier, 2008). These atmospheric models are described in more detail in Section 6.…”

Section: Eve Science Teammentioning

confidence: 99%

“…These solar irradiance products have been developed and tested for i) daily time resolution for historical, nowcast, and intermediate-term forecast periods with one-day granularity, one-hour cadence, and onehour latency extending 4.5 months; ii) high time resolution for recent, nowcast, and shortterm forecast periods with three-hour granularity, one-hour cadence, and one-hour latency extending 96 hours; and iii) precision time resolution for recent, current epoch, and nearterm forecast periods with one-minute granularity, two-minute cadence, and five-minute latency extending to six hours. The SIP incorporates empirical and physics-based solar irradiance models such as SOLAR2000 (Tobiska, , 2008Tobiska and Bouwer, 2006;Tobiska et al, 2000) and SOLARFLARE (Tobiska and Bouwer, 2005;Tobiska, 2007) along with reference rocket measurements and real-time satellite data stream systems such as APEX for SOHO/SEM data as well as GOES/XRS and TIMED/SEE data.…”

Section: Sip Hybrid System Of Data and Modelsmentioning

confidence: 99%

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

et al. 2010

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The highly variable solar extreme ultraviolet (EUV) radiation is the major energy input to the Earth's upper atmosphere, strongly impacting the geospace environment, affecting satellite operations, communications, and navigation. The Extreme ultraviolet Variability Experiment (EVE) onboard the NASA Solar Dynamics Observatory (SDO) will measure the solar EUV irradiance from 0.1 to 105 nm with unprecedented spectral resolution (0.1 nm), temporal cadence (ten seconds), and accuracy (20%). EVE includes several irradiance instruments: The Multiple EUV Grating Spectrographs (MEGS)-A is a grazingincidence spectrograph that measures the solar EUV irradiance in the 5 to 37 nm range with 0.1-nm resolution, and the MEGS-B is a normal-incidence, dual-pass spectrograph that measures the solar EUV irradiance in the 35 to 105 nm range with 0.1-nm resolution. To provide MEGS in-flight calibration, the EUV SpectroPhotometer (ESP) measures the solar EUV irradiance in broadbands between 0.1 and 39 nm, and a MEGS-Photometer measures the Sun's bright hydrogen emission at 121.6 nm. The EVE data products include a near real-time space-weather product (Level 0C), which provides the solar EUV irradiance in specific bands and also spectra in 0.1-nm intervals with a cadence of one minute and with a time delay of less than 15 minutes. The EVE higher-level products are Level 2 with the solar EUV irradiance at higher time cadence (0.25 seconds for photometers and ten seconds for spectrographs) and Level 3 with averages of the solar irradiance over a day and over each one-hour period. The EVE team also plans to advance existing models of solar EUV irradiance and to operationally use the EVE measurements in models of Earth's ionosphere and thermosphere. Improved understanding of the evolution of solar flares and extending the various models to incorporate solar flare events are high priorities for the EVE team.

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Section: Eve Objective 2 -Understand Why Solar Euv Irradiance Variesmentioning

confidence: 99%

Section: Eve Science Teammentioning

confidence: 99%

Section: Sip Hybrid System Of Data and Modelsmentioning

confidence: 99%

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

et al. 2010

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“…The photoelectron flux is calculated with with an electron-two-stream code [Gustavsson and Eliasson, 2008]. The photoelectron production we calculate with photoionization cross sections compiled by Itikawa et al [1986Itikawa et al [ , 1989 and Itikawa and Ichimura [1990] and solar EUV fluxes from SOLAR2000 [Tobiska and Bouwer, 2006] with one scale factor for wavelengths below 1200 Å and another for wavelengths below 250 Å. In Figure 7 the scaled EUV photon fluxes are shown together with the EUV fluxes from SOLAR2000.…”

Section: Appendix A: Electron Heating As a Means To Estimate Neutral mentioning

confidence: 99%

Rise and fall of electron temperatures: Ohmic heating of ionospheric electrons from underdense HF radio wave pumping

et al. 2010

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[1] Here we present electron temperature variations observed with incoherent scatter radar during a European Incoherent Scatter Scientific Association Heating experiment with high-frequency (HF) radio wave transmission at frequencies above the peak ionospheric critical frequency. The electron temperature increased from 2000 K up to 2800 K during the HF transmission periods. During the experiment both pump frequency and polarization were altered between pump pulses. The observed temperature variation is compared with numerical solutions to the electron energy equation with ohmic heating modeling the effect of the radio wave heating of the plasma. Agreement between observations and model is found to be good.

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“…They provide solar spectral irradiances and integrated solar irradiance proxies from 1947 to 2052. It includes complementary models to extend to the vacuum ultraviolet (VUV) (Tobiska and Bouwer 2006). The most recent code implementation is SIP (Solar Irradiance Platform) that produces the variable, full solar spectrum in assorted spectral formats for historical, nowcast, and forecast applications as well as an array of solar irradiance and thermospheric proxies (Tobiska 2008).…”

Section: Solar Xuv-euv Models For Space Weather Applicationsmentioning

confidence: 99%

Solar Weather Event Modelling and Prediction

et al. 2009

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Key drivers of solar weather and mid-term solar weather are reviewed by considering a selection of relevant physics-and statistics-based scientific models as well as a selection of related prediction models, in order to provide an updated operational scenario for space weather applications. The characteristics and outcomes of the considered scientific and prediction models indicate that they only partially cope with the complex nature of solar activity for the lack of a detailed knowledge of the underlying physics. This is indicated by the fact that, on one hand, scientific models based on chaos theory and non-linear dynamics reproduce better the observed features, and, on the other hand, that prediction models based on statistics and artificial neural networks perform better. To date, the solar weather prediction success at most time and spatial scales is far from being satisfactory, but the forthcoming ground-and space-based high-resolution observations can add fundamental tiles to the modelling and predicting frameworks as well as the application of advanced mathematical approaches in the analysis of diachronic solar observations, that are a must to provide comprehensive and homogeneous data sets.

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New developments in SOLAR2000 for space research and operations

Cited by 66 publications

References 37 publications

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

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

Rise and fall of electron temperatures: Ohmic heating of ionospheric electrons from underdense HF radio wave pumping

Solar Weather Event Modelling and Prediction

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