... Title : Absolute, Extreme Ultraviolet Solar Spectral Irradiance Monitor (AESSIM). ... film filters to make absolute measurements of EUV radiation over a ...
DTIC Science & Technology
Measurements of absolute continuum intensities in the wavelength range 1420-1960 A are presented for
NASA Technical Reports Server (NTRS)
... EUV photons are absorbed in the terrestrial thermosphere and mesosphere, ie ... spacecraft were launched in 1977 for extensive explorations of the ...
... the Solar Extreme Ultraviolet Hitchhiker (SEH) is designed to obtain absolute solar EUV ... a highly stable silicon photodiode, and a spectrometer assembly.
NASA Website
First light measurements from the SDO/EVE EUV Spectrophotometer (ESP) are calibrated based on both ESP pre-flight radiometric calibration and the SDO EVE calibration rocket un-derflight (5 May 2010) measurements obtained with the ESP and Multiple EUV Grating Spec-trometers (MEGS), which are clones of the SDO EVE onboard instruments. SDO/EVE/ESP ...
NASA Astrophysics Data System (ADS)
The SOHO/CELIAS Solar EUV Monitor (SEM) has measured absolute EUV solar irradiance nearly continuously over a 15 year period that includes both the cycle 22/23 (1996) and cycle 23/24 (2008) solar minima. These measurements indicate that irradiance in the 26-34 nm spectral ...
Accurate solar extreme ultraviolet (EUV) spectral irradiance data are needed for research in solar, ionospheric/thermospheric, and planetary physics, as well as for space weather forecasts and spacecraft operations and tracking. Because of instrument perf...
National Technical Information Service (NTIS)
We have developed a prototype spectrometer for space applications requiring long term absolute EUV photon flux measurements. In this recently developed spectrometer, the energy spectrum of the incoming photons is transformed directly into an electron ener...
Long-term radiometric accuracy is a fundamental requirement for future measurement of solar and terrestrial atmospheric EUV emissions from space. Since remote sensing of EUV radiation will become an important measuring technique to explore the thermosphere, new methods have to be established to trace calibration changes of ...
Solar EUV radiation and its variability is of central importance to the earths upper atmosphere. Variability of the earths upper atmosphere is a major concern to NASAs satellite missions. This LARGE PROJECT (2 year) proposal asks for continued measurments of solar EUV variability using EUVE ...
The Solar Extreme ultraviolet Experiment (SEE) on the NASA Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) mission has been observing the solar spectral irradiance in the 0.1 - 194 nm spectral range during the declining phase of solar cycle 23 and is expected to continue into the rising phase of ...
Temporal variations of solar EUV enhancements associated with flares measured by spectrometer aboard
A transmission grating extreme ultraviolet (EUV) spectrometer, nominally identical to the Charge, Element, and Isotope Analysis System/Solar EUV Monitor (CELIAS/SEM) instrument on the Solar and Heliospheric Observatory (SOHO), has obtained accurate measurements of the integrated absolute ...
The goal of this research program is development of a method for obtaining daily, radiometrically accurate, solar spectral irradiance data at extreme-ultraviolet (EUV) wavelengths. In-orbit radiometric instrumentation recalibration is a fundamental requirement for such measurements. The authors proposed to investigate, design, and test smaller and less ...
Energy Citations Database
New models of solar extreme ultraviolet (EUV) irradiance variability are constructed in 1 nm bins from 0 to 120 nm using multiple regression of the Mg II and F10.7 solar activity indices with irradiance observations made during the descending phase of cycle 23. The models have been used to reconstruct EUV spectra ...
This paper reviews the problem of absolute photometric calibration in the extreme uv range with particular reference to a solar satellite instrument. EUV transfer standards, the use of predispersing spectrometers, and polarization effects at near normal incidence are discussed. Changes in preflight calibration associated with the ...
PubMed
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 ...
heating the thermosphere, creating the ionosphere, and initiating many complex photochemical ... example, the heating of the thermosphere by solar EUV ...
... Accession Number : ADA032386. Title : Solar EUV Spectrophotometer for Atmosphere Explorer Satellites. Descriptive Note : Final rept. ...
In the field of terrestrial climatology the continuous monitoring of the solar irradiance with highest possible accuracy is an important goal. SolACES as a part of the ESA mission SOLAR on the ISS is measuring the short-wavelength solar EUV irradiance from 16�150 nm. This data will be made available to the ...
Long-term radiometric accuracy is a fundamental requirement for the measurement of solar, terrestrial, and/or planetary atmospheric EUV emissions from space. Due to non-traceable changes of the numerous spectrometric efficiency parameters with time, long-term stability of satellite instrumentation has not been achieved in the past. One possibility to ...
First results from SDO/EVE/ESP in four spectral channels are presented. These results include solar irradiance measurements in the channels centered on 3.5, 17, 26, and 30.4 nm. The Quad Diode (QD) channels (0.1 - 7.0 nm) can be used as a solar flare detector that has a large dynamic range (covering B to X-class flares) and provides information on flare ...
... (Author). Descriptors : *SOLAR RADIATION, *ULTRAVIOLET SPECTROMETERS, MODIFICATION, GRATINGS(SPECTRA), GROUND ...
In the field of terrestrial climatology the continuous measuring of the solar irradiance with highest possible accuracy is an important goal. SolACES as a part of the ESA SOLAR ISS mission is measuring the short-wavelength solar EUV irradiance from 16 -150nm. These data will be provided to the scientific community ...
The high-resolution EUV spectroheliometer (HiRES) is our first step towards the 0.1 arc sec angular resolution goal at EUV wavelengths. The HiRES instrument consists of a Gregory telescope with a 45-cm-diameter primary mirror, and an imaging EUV spectrometer, employing a single-reflection toric diffraction grating in a Rowland circle ...
We report first absolute effective quantum efficiency (e-h pairs collected/predicted) measurements of a monolithic, thinned, back-illuminated CMOS Active Pixel Sensor (APS) in the EUV and soft X-ray region (13-600 �). The sensor was designed and fabricated under a joint RAL/e2v research program, and characterized in the Lockheed Martin ...
A verified and updated version of the calibrated SOHO/CELIAS/SEM (absolute) solar extreme ultraviolet (EUV) measurements from the beginning of the mission in 1996 through the present is available at the University of Southern California Space Sciences Center website (www.usc.edu/dept/space_science). To complete this new version, ...
The Extreme ultraviolet SpectroPhotometer (ESP) is one of five channels of the Extreme ultraviolet Variability Experiment (EVE) onboard the NASA Solar Dynamics Observatory (SDO). The ESP channel design is based on a highly stable diffraction transmission grating and is an advanced version of the Solar Extreme ultraviolet Monitor (SEM), which has been ...
SOLAR is a set of three solar instruments measuring the total and spectral absolute irradiance from 16 nm to 3080 nm for solar, atmospheric and climatology physics. It is an external payload for the COLUMBUS laboratory launched on 7 February 2008. The mission�s primary objective is the measurement of the ...
... Title : THE SOLAR EUV FLUX BETWEEN 230 AND 1220 ANGSTROMS ON NOVEMBER 9, 1971,IN: JOURNAL OF GEOPHYSICAL RESEARCH ...
... Information on time variation in solar flux for longer periods is provided in two forms, one giving wavelength flux data and the other flux scan data. ...
Solar EUV Experiment (SEE) Data from the Thermosphere, Ionosphere, ... TIMED > Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics � Ancillary ...
The Multi-order Solar EUV Spectrograph (MOSES) is a slitless spectrograph designed to study solar He
Sep 8, 2006 ... PROPOSAL TITLE: Gadolinium EUV multilayers for solar imaging near 60 nm ... APPLICATIONS ( Limit 1500 characters, approximately 150 words) ...
... Calculation of the Solar UV/EUV Spectrum in ... day of the observation, the spectrum practically represents ... good agreement of the spectra shows that ...
The new solar extreme ultraviolet (EUV) irradiance observations from NASA Solar Dynamics Observatory
One of the outstanding questions of Martian aeronomy is the loss rate of atmospheric ions to the solar wind. The outer atmosphere is exposed to the solar wind convection electric field and thus it is expected, and confirmed by observations, that Mars loses its outer ionosphere due to ion pickup. The importance of this loss process relative to other loss ...
Degradation of optics and detectors is a difficult technical issue for satellite-borne extreme ultraviolet (EUV) instrumentation, in particular for solar spectral irradiance monitors. Traditional techniques of tracking changes in instrument responsivities have included redundant channels, on-board sources, and sounding rocket underflights. Such methods ...
A verified and updated version of the calibrated SOHO/CELIAS/SEM (absolute) solar extreme ultraviolet (EUV) measurements from the beginning of the mission in 1996 through the present is available at the University of Southern California Space Sciences Center website. To complete this new version, six (1999- 2006) sounding rocket ...
New evidence for a latitudinal decrease of the solar wind mass flux is presented from observations of the interplanetary Lyman alpha emission collected in 1976 and 1977 with satellites Prognoz 5 and 6. The flow of interstellar hydrogen atoms in the solar system is ionized by EUV solar radiation and charge exchange ...
We describe the application and current status of the Solar Radiation Physical Modeling (SRPM) project for understanding the nature of the solar EUV and UV irradiance variations and building tools to forecast short and medium term variations of the solar irradiance spectrum at any location in the Heliosphere. These ...
