Record Details

Solar Rotational Modulations of Spectral Irradiance and Correlations with the Variability of Total Solar Irradiance
External Online Source: doi:10.1051/swsc/2016028
Author and Affiliation:
Lee, Jae N.(Maryland Univ. Baltimore County, Baltimore, MD, United States);
Cahalan, Robert F.(NASA Goddard Space Flight Center, Emeritus, Greenbelt, MD, United States);
Wu, Dong L.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Abstract: Aims: We characterize the solar rotational modulations of spectral solar irradiance (SSI) and compare them with the corresponding changes of total solar irradiance (TSI). Solar rotational modulations of TSI and SSI at wavelengths between 120 and 1600 nm are identified over one hundred Carrington rotational cycles during 2003-2013. Methods: The SORCE (Solar Radiation and Climate Experiment) and TIMED (Thermosphere Ionosphere Mesosphere Energetics and Dynamics)/SEE (Solar EUV Experiment) measured and SATIRE-S modeled solar irradiances are analyzed using the EEMD (Ensemble Empirical Mode Decomposition) method to determine the phase and amplitude of 27-day solar rotational variation in TSI and SSI. Results: The mode decomposition clearly identifies 27-day solar rotational variations in SSI between 120 and 1600 nm, and there is a robust wavelength dependence in the phase of the rotational mode relative to that of TSI. The rotational modes of visible (VIS) and near infrared (NIR) are in phase with the mode of TSI, but the phase of the rotational mode of ultraviolet (UV) exhibits differences from that of TSI. While it is questionable that the VIS to NIR portion of the solar spectrum has yet been observed with sufficient accuracy and precision to determine the 11-year solar cycle variations, the temporal variations over one hundred cycles of 27-day solar rotation, independent of the two solar cycles in which they are embedded, show distinct solar rotational modulations at each wavelength.
Publication Date: Sep 05, 2016
Document ID:
20170002306
(Acquired Mar 17, 2017)
Subject Category: SPACE RADIATION; SOLAR PHYSICS
Report/Patent Number: GSFC-E-DAA-TN39699
Document Type: Journal Article
Publication Information: Journal of Space Weather and Space Climate (e-ISSN 2115-7251); Volume 6; A33
Publisher Information: EDP Sciences
Contract/Grant/Task Num: NNX15AT34A
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 13p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CORRELATION; DECOMPOSITION; IRRADIANCE; MODULATION; SOLAR RADIATION; SOLAR ROTATION; SOLAR SPECTRA; SPECTRAL EMISSION; TEMPORAL DISTRIBUTION; TWENTY-SEVEN DAY VARIATION; VARIABILITY; CLIMATE; EARTH IONOSPHERE; LIGHT (VISIBLE RADIATION); NEAR INFRARED RADIATION; SOLAR CYCLES; THERMOSPHERE; ULTRAVIOLET SPECTRA
Other Descriptors: SORCE; TOTAL SOLAR IRRADIANCE; SPECTRAL SOLAR IRRADIANCE
Availability Source: Other Sources
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