NASA Earth Science Division solar irradiance missions and time covered by the Solar Irradiance Science Team programs. These missions have both total solar irradiance (TSI) and solar spectral irradiance (SSI) observations, except that TSI Calibration Transfer Experiment only has TSI measurements and Ozone Monitoring Instrument and Solar Backscatter Ultraviolet/2 only have SSI measurements. In order to prevent a gap, the Total and Spectral Solar Irradiance Sensor‐1 mission could be extended to overlap with the Total and Spectral Solar Irradiance Sensor‐2 mission that is anticipated to launch in late 2024. The solar activity time series is the normalized sunspot number smoothed by 243 days, and a rough estimate of the Solar Cycle 25 activity is included as the dashed line.