Results 51 to 60 of about 17,007 (164)

Solar irradiance variations

Eos, Transactions American Geophysical Union, 1983
The planned repair in orbit by NASA of the Solar Maximum Mission (SMM) in April 1984 provides an excellent opportunity for improved observations of the sun. In retrospect the solar‐terrestrial research community should have organized new programs before the 1980 launch of this satellite, but foresight is sometimes difficult to achieve.
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Solar irradiance variability [PDF]

Proceedings of the International Astronomical Union, 2006
AbstractWe study solar irradiance variability. The current generation of models show that the irradiance since then has increased by between 0.9 and 1.5 W m−2.
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Solar irradiance reconstruction over the telescopic era using a revised photospheric magnetic field model

Astronomy & Astrophysics
The Sun is the primary source of energy for Earth and one of the main external drivers of its climate. Solar irradiance – the radiative power emitted by the Sun and received at 1 AU – varies on all observable timescales. It is measured as the total solar
Temaj D., Krivova N. A., Chatzistergos T., Solanki S. K., Hofer B.   +4 more
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Extreme ultraviolet solar irradiance during the rising phase of solar cycle 24 observed by PROBA2/LYRA

Journal of Space Weather and Space Climate, 2012
The Large-Yield Radiometer (LYRA) is a radiometer that has monitored the solar irradiance at high cadence and in four pass bands since January 2010. Both the instrument and its spacecraft, PROBA2 (Project for OnBoard Autonomy), have several innovative ...
Zender Joe, Dominique Marie, Dammasch Ingolf E., Kretzschmar Matthieu, Cessateur Gaël, D’Huys Elke   +5 more
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Maximum power point tracking enhancement for PV in microgrids systems using dual artificial neural networks to estimate solar irradiance and temperature

Results in Engineering
This paper presents an artificial neural network-based maximum power point tracking (MPPT) method. Where dual ANNs predict solar irradiance and temperature. Next, an adaptive computation block determines the maximum power point (MPP).
Ahmad M.A. Malkawi, Zuhour A.B. Alsaqqa, Tareq O. Al-Mosa, Wa'el M. JadAllah, Mohannad M.H. Sadeddin, Ayman Al-Quraan, Mohammad AlMashagbeh   +6 more
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The role of solar ultraviolet irradiation in zoster

Epidemiology and Infection, 2002
Ultraviolet radiation (UVR) suppresses many aspects of cell-mediated immunity but it is uncertain whether solar UV exposure alters resistance to human infectious diseases. Varicella-zoster virus (VZV) causes varicella (chickenpox) and can reactivate from latency to cause zoster (shingles).
M, Zak-Prelich, J L, Borkowski, F, Alexander, M, Norval   +3 more
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Reconstruction of the solar spectral UV irradiance for nowcasting of the middle atmosphere state on the basis of LYRA measurements [PDF]

Atmospheric Chemistry and Physics, 2008
The LYRA instrument onboard ESA PROBA2 satellite will provide 6-hourly solar irradiance at the Lyman-alpha (121.6 nm) and the Herzberg continuum (~200–220 nm wavelength range). Because the nowcasting of the neutral and ionic state of the middle
T. Egorova, E. Rozanov, J.-F. Hochedez, W. Schmutz   +3 more
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A Comparative Analysis of the Solar Ultraviolet Spectral Irradiance Measured from Earth and Mars: Toward a General Empirical Model for the Study of Planetary Aeronomy

The Astrophysical Journal Supplement Series
Accurate estimation of the solar vacuum ultraviolet irradiance between 0.1 and 200 nm is critical for the study of planetary aeronomy. Previous empirical models have relied on a limited number of reference spectra, or on multiple data sets with various ...
Zhen Xu, Jianqi Qin
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Calibration of the solar position sensor on GOES-R as a proxy for total solar irradiance I: Modeling the SPS bandpass

Journal of Space Weather and Space Climate
Context: The Geostationary Environmental Operational Satellites R series (GOES-R) includes an instrument that measures visible light from the Sun at high cadence: the Solar Position Sensor (SPS).
Snow M., Penton S., Woodraska D., Béland S., Coddington O.   +4 more
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Advancements in solar spectral irradiance measurements by the TSIS-1 spectral irradiance monitor and its role for long-term data continuity

Journal of Space Weather and Space Climate
The first implementation of NASA’s Total and Spectral Solar Irradiance Sensor (TSIS-1) launched on December 15th, 2017, and was integrated into the International Space Station (ISS) to measure both the total solar irradiance (TSI) and the solar spectral ...
Richard Erik, Coddington Odele, Harber Dave, Chambliss Michael, Penton Steven, Brooks Keira, Charbonneau Luke, Peck Courtney, Béland Stéphane, Pilewskie Peter, Woods Tom   +10 more
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