Science Seminars

Flare Irradiance Spectral Model – Version 2 (FISM2): Taking Advantage of Over 15 Years of CU/LASP Solar Ultraviolet Spectral Irradiance Measurements

Speaker: Phil Chamberlin (CU/LASP)
Date: Thursday, Oct 10, 2019
Time: 4:00 PM
Location: SPSC W120

Seminar Abstract:

The Flare Irradiance Spectral Model (FISM) was released in 2005 to estimate the solar ultraviolet spectral irradiance from 0-190 nm, and was the first empirical model to estimate solar irradiance variations due to solar flares. This model has been used in hundreds of publications, many investigating the impact solar ultraviolet variations on timescales of minutes to decades have in driving changes in planetary ionosphere and thermosphere (I/T) systems. Since its initial release, the next generation of instruments have compiled a more complete and accurate dataset of solar spectral irradiance variations on solar cycle, solar rotation, and solar flare timescales. These missions include the Miniature X-Ray Solar Spectrograph (MinXSS), the EUV Variability Experiment (EVE) on the Solar Dynamics Observatory (SDO), the SOlar Radiation and Climate Experiment (SORCE) Solar Stellar Irradiance Comparison Experiment (SOLSTICE), and the EUV Monitor (EUVM) on the Mars Atmosphere and Volatile Evolution missioN (MAVEN). All of these missions have contributed to improving FISM to the newly released Version 2, FISM2. FISM2 has higher spectral bins (0.1nm) and is based on years of observations and thousands of solar flares that lead to more accurate results on all timescales. This release of FISM2 is timely with the loss of the SDO/EVE MEGS-A channel and the reduced cadence of its MEGS-B channel, as well as nearing the end of the SORCE mission, leading to large current and near-future spectral gaps in ultraviolet solar irradiance measurements, while also improving historical results for the decades prior to these missions. This talk will present new results from FISM2, including some initial results from studies utilizing FISM2 to drive I/T systems. Concluding the talk will be a brief presentation of future solar irradiance measurements that take advantage of CubeSat platforms to provide solar ultraviolet measurements.