A Comparison of Total Solar Irradiance to the Mg II Index Based on SORCE Measurements

Details A Comparison of Total Solar Irradiance to the Mg II Index Based on SORCE Measurements A Comparison of Total Solar Irradiance to the Mg II Index Based on SORCE Measurements

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh23b..04k&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SH23B-04

Physics

1650 Solar Variability, 7507 Chromosphere, 7529 Photosphere, 7538 Solar Irradiance, 7594 Instruments And Techniques

Scientific paper

The reconstruction of the total solar irradiance (TSI) over the long-term often uses sunspot area and a faculae proxy such as the Mg II core-to-wing index (Mg index). With interest in validating this approach, we compare the Mg index to TSI measurements using data from NASA's SOlar Radiation and Climate Experiment (SORCE). The SORCE carries four solar irradiance instruments that have been monitoring the Sun since early 2003. The Total Irradiance Monitor (TIM) measures the TSI with unprecedented stability and low noise during the daytime portion of each spacecraft orbit with a time cadence of 100 seconds. The SOLar STellar Irradiance Comparison Experiment (SOLSTICE) measures solar spectral irradiance from 115 to 320 nm, having 0.1 nm spectral resolution at the Mg II lines near 280 nm. The Mg II lines are scanned approximately seven times each day, and the Mg index provides a good indicator of chromospheric activity. We compare the SOLSTICE Mg II core-to-wing index to TIM TSI measurements, giving advantages over previous comparisons including simultaneity, low noise, and high spectral resolution for the Mg II lines.

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