Short-term temporal variations of NIMBUS-7 measurements of the solar UV spectral irradiance

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Published by U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, For sale by the National Technical Information Service in Silver Spring, Md, Springfield, VA .

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  • Nimbus (Artificial satellite),
  • Solar radiation -- Measurement

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Other titlesShort term temporal variations of NIMBUS-7 measurements of the solar UV spectral irradiance
StatementRichard F. Donnelly ... [et al.]
SeriesNOAA technical memorandum ERL ARL -- 154
ContributionsDonnelly, Richard Frank, Environmental Research Laboratories (U.S.)
The Physical Object
Paginationiii, 59 p. :
Number of Pages59
ID Numbers
Open LibraryOL14289655M

Download Short-term temporal variations of NIMBUS-7 measurements of the solar UV spectral irradiance

NIMBUS-7 measurements of the solar spectral irradiance in the to nm range during Nov. 7, to Oct. 29, were analyzed to determine the characteristics of their short term variations. The persistance of solar-rotational variations is shown to be uniformly high for the UV wavelengths important for inducing stratospheric photochemical reactions and Cited by: 6.

Get this from a library. Short-term temporal variations of NIMBUS-7 measurements of the solar UV spectral irradiance. [Richard Frank Donnelly. Nimbus 7 and Solar Stellar Irradiance Comparison Experiment (SOLSTICE) spacecraft measurements of solar irradiance both exhibit variability at mid ( nm) and near ( nm) ultraviolet.

both temporal and spectral variations in solar UV irradiance is necessary to model and understand atmospheric behavior. Figure 1 also shows that only space-based measurements can gather this infonnation on a regular basis. Solar UV measurements have been made by at least seventeen satellite instruments sinceas shown in Figure Size: 1MB.

Solar EUV/UV Irradiance Spectrum I extends from 30 nm in the EUV to the visible ( nm) I spans roughly 5 orders of magnitude I contains about % of the total solar flux I shows exponential increase in FUV to Al-edge ( nm) I for increasing λ, the spectrum is characterized by: I strong emission lines (– nm) I absorption lines (– nm) I line-blanketed File Size: 2MB.

Temporal Variations in Solar Irradiance Since The UV solar irradiance measurements from the UARS and SORCE missions are mutually consistent up to about nm before they start to exhibit.

Fig. 1 shows the solar ultraviolet irradiance between and nm where the spectrum is displayed with an effective spectral resolution of 1 nm.

This spectrum has the general characteristic of a continuum spectrum, superposed at the longer wavelengths with many absorption features, both lines and absorption edges, and at the shorter wavelengths Cited by: ground-based and space-borne measurements of the solar irradiance spectrum as well as measurements of relative alirradiancevari-ations are discussed in Sectionwhile we focus on short-term variations in Section In Section 3, we il-lustrate how well even a simple model based on surface.

Solar ultraviolet radiation (λsolar energy is deposited varies with wavelength, as shown in Fig.accurate knowledge of both temporal and spectral variations in solar UV irradiance is necessary to model and understand Cited by: Our best UV, visible and IR spectra are finally merged into a single absolute solar irradiance spectrum covering the to nm domain.

Introduction The absolute solar spectral irradiance from – nm has many interests rang-ing from solar physics to climatology and Earth’s environment physics. Variations through out the solar cycle • Is the solar cycle variation evident in the VUV spectrum. • Is the variation due to the solar cycle the same over the spectrum.

Is the variation the same for the features • Is the magnitude the same. Is the period or phase the same.

Variations over the course of a year. SOLAR IRRADIANCE VARIATIONS solar activity maximum. These dips are seen to coincide with the presence of sunspots on the solar disc. The measurements made by the VIRGO instrument near the time of solar activity minimum allow individual active regions to be singled out and their evolution to be followed, directly revealing the brightening due to.

SOLAR SPECTRAL IRRADIANCE, SOLAR ACTIVITY, AND THE NEAR-ULTRA-VIOLET J. Fontenla1, P. Stancil2, and E. Landi3 1 NorthWest Research Associates, Boulder, COUSA; [email protected] 2 Department of Physics and Astronomy and Center for Simulational Physics, The University of Georgia, Athens, GAUSA; [email protected] 3 Cited by: Solar Ultraviolet Spectral Irradiance Table Of Contents: 1.) SOLAR Model (K.

Tobiska) Feb present 2.) NOAA MgII Core-to-wing ratio data present (R. Viereck) 3.) SORCE (Solar Radiation and Climate Experiment) satellite data present (G. Rottman) 4.) Older archival databases: 4a.) Dr. John Arvesen's Solar Spectral Irradiance data at the top of the.

The study of variations in total solar irradiance (TSI) and spectral irradiance is important for understanding how the Sun affects the Earth’s climate.

A data-driven approach is used in this article to analyze and model the temporal variation of the TSI and Mg ii index back to In both cases, observed data in the time interval of the satellite era, –Cited by: 2.

Variations of solar total and spectral irradiance are prime solar quantities purported to have an influence on the Earth’s climate. Quantitative estimates of irradiance over as long a time as possible are needed to judge their effectiveness in forcing the climate.

In order to do this reliably, first the measured record must be reproduced and a feeling for the physics Cited by: solar spectral irradiance variability in the visible – nm fraunhofer lines increased in depth (intensity) equivalent width (total energy absorbed by the line from continuum) solar constant decrease arising in the nm 3 2%% of the solar constant change arising in the nm.

Short spectral scan times of preferably less than 1 min in the UV region are an important prerequisite for modern spectroradiometers to reflect short-term solar irradiance radiation variations that can occur as a result of fast changes in cloud cover and/or cloud optical by: 7.

spectral solar irradiance variations, as described by Haigh (), may lead to climate effects from solar-rotational variations influencing longer timescales by affecting Earth-atmospheric circulation patterns, however. Such mechanisms are beginning to be modeled, but the magnitudes of their effects are not yet known.

Cited by: Solar Spectral Irradiance (W mnm 1) Solar Spectral Irradiance is defined as the radiant power per unit area per unit wavelength interval incident on a plane surface at the top of the atmosphere that is normal to the direction from the Size: 7MB.

Abstract The study of variations in total solar irradiance (TSI) and spectral irradiance is important for understanding how the Sun affects the Earth's climate. A data-driven approach is used in this article to analyze and model the temporal variation of the TSI and Mg ii.

Furthermore the Spectral Irradiance Monitor (SIM) has found in the same period that spectral solar irradiance (SSI) at UV (ultraviolet) wavelength corresponds in a less clear, and probably more complicated fashion, with earth’s climate responses than earlier assumed, fueling broad avenues of new research in “the connection of the Sun and.

Solar irradiance is the power per unit area (watt per square metre, W/m 2), received from the Sun in the form of electromagnetic radiation as reported in the wavelength range of the measuring instrument. Solar irradiance is often integrated over a given time period in order to report the radiant energy emitted into the surrounding environment (joule per square metre, J/m 2).

Understanding the solar irradiance variability 3-component model: quiet sun — faculae — sun spots. Modeling of the solar UV irradiance variation • evaluate the effects of variations in spectral solar irradiance input on ozone and other trace gasesFile Size: 6MB.

of spectral irradiance, the sun’s angle with respect to the measurement location, pollution, and weather conditions play a significant role.

Research pertaining to the effect of seasonal variation on solar spectral irradiance can be found in Lopez and. Cabrol et al. Record solar UV irradiance. spectral irradiance data with the erythemal action spectrum by CIE (McKinlay and Diffey, ).

THEJANUARY17,CASE Figure3. illustrates the Janu case. UV-A increased in the morning to values that reached or exceeded clear-sky irradi-ance for a few minutes, possibly partly due to cloud.

Schmidt et al.: Sky-imager-based solar irradiance analysis and forecasts With the aim to fill this gap of local high-resolution and very short term forecasts, recent research has made use of ground-based (whole/all/total) sky imagers.

Sky imagers have been used for years for monitoring cloud cover char. ured solar spectral W irradiance from March to Mayproviding the first solar irradi- ance data set covering a complete solar cycle from one minimum to the next.

Previous work has examined short-term solar variability during solar minima from the uncorrected NOAA-9 irradi- ance data [DeLand and Cebula, al. This paper describes the Author: Matthew T. DeLand, Richard P. Cebula, Ernest Hilsenrath.

Introduction. The solar spectral irradiance (SSI) varies on all time scales, and these variations are highly dependent on wavelength. The short-term (days) variations are best understood from observations obtained from several different satellites over the past five by: The accurate measurement of solar uv spectral irradiance is considerably more difficult and much more complex then measuring the spectral output of most other types of "light" sources.

The extremely rapid decrease in the spectral irradiance of sunlight with decreasing wavelength coupled with the relatively large amount of solar irradiance at the.

cornerstone of this research has been measurements of the spectral distribution of UV irradiance, firstly at Lauder, starting inand more recently at other locations.

These spectral measurements at Lauder are calibrated against NIST radiation standards via transfer standards maintained by IRL.

that have been employed for irradiance forecasting. The most basic model is the persistence forecast, which is a naive predictor that assumes that the best predictor of solar irradiance at time t+ 1; X t+1, is the irradiance at time t, X t.

This is the baseline comparison used in the work of Perez et al. [5]. Sharma et. al report resultsFile Size: KB. High elevation, thin ozone layer, and clear sky produce intense ultraviolet (UV) radiation in the tropical Andes. Recent models suggest that tropical stratospheric ozone will slightly decrease in the coming decades, potentially resulting in more UV anomalies.

Data collected between and m above sea level (asl) in Bolivia show how this trend could dramatically impact surface solar Cited by: •Disagreeing Spectral Solar Irradiance measurements – used as forcing – produce different responses of the terrestrial atmospheric chemical composition •Therefore, it is important to assess the amplitudes (including the signs!) of the variations as.

Most popular configuration. The SolarRad features everything needed to perform light measurements over the nm wavelength range (with deep UV options available). At the heart of the system is the BLACK-Comet-CXR-SR concave grating spectrometer featuring a UV enhanced CCD detector The SolarRad-DSR is a dual channel spectrometer system configured for wide range solar spectral irradiance.

Measurements have shown that stratospheric temperatures vary by about 1 °C ( °F) over the course of a solar cycle, and Cahalan has demonstrated that inputting SIM’s measurements of spectral irradiance into a climate model produces variations of that same magnitude.

The three outdoor runs, from top to bottom, showing the (left) spectral irradiance plot for each participating spectroradiometer and SMARTS model spectral irradiance output and (right) ratio using the average spectrum from the participating spectroradiometers.

13 Figure 8. Three spectral irradiance results using the SMARTS model. An Empirical Model of the Variation of the Solar Lymanâ α Spectral Irradiance PHYSICS: Solar cycle variations; SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY: Solar activity cycle, Solar and stellar variability, Solar irradiance, Ultraviolet emissions; SPACE WEATHER: Solar effects Keywords: /GL and solar irradiance; solar Cited by: 3.

Solar Spectral Irradiance Validation: UV/Vis/IR 17 OCT 03 30 OCT 03 File Size: 4MB. Precise solar irradiance measurements obtained during the past 3 decades imply that the TSI varies on the order of % over the year solar cycle, but with greater variations on day-to-month scales due to solar rotation and the passage of sunspots and facular regions across the solar.

Solar irradiance measurements are notoriously unreliable with the best methods (1% to 3% such as temporal variation (variation over time) Transient Response — The short-term response of an instrument caused by a change of status of the instrument's environment.

For example, the switching of a power supply on and off will send very.The 22 DU RMSE for the predicted total ozone arose from short-term variations. Because of the large short-term discrepancies of the total ozone, the modeled UV irradiance varied from 7% to 8%.

In addition, the modeled UV irradiance also varied between % and % due to the spatial and temporal variation of AOD in South Korea, : Sang Seo Park, Yun Gon Lee, Migyoung Kim, Jaemin Kim, Ja-Ho Koo, Chang Ki Kim, Junshik Um, Jongmin Y.3) Temporal Instability of Irradiance This parameter represents the fluctuation of the measurement system during the interval required to fully obtain a current-voltage (I-V) curve which depends on the application.

Sciencetech’s solar simulators reach 1% stability after a 5 minute warmup. Each solar simulator is configured to your Size: KB.

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