Question

Which is an accurate statement about the different types of radiation that are measured in the Total Solar Irradiance? Select the two correct answers.
Responses

Radiation with long infrared wavelengths is most likely to have the widest variation.
Radiation with long infrared wavelengths is most likely to have the widest variation. - no response given

Radiation with short wavelengths is emitted steadily and constantly from the sun.
Radiation with short wavelengths is emitted steadily and constantly from the sun. - no response given

Radiation in the visible light wavelengths is emitted steadily and constantly from the sun.
Radiation in the visible light wavelengths is emitted steadily and constantly from the sun. - no response given

Radiation in the short extreme ultraviolet (EUV) range is most likely to have the widest variation.
Radiation in the short extreme ultraviolet (EUV) range is most likely to have the widest variation. - no response given

Answer 1

Correct answers:
- Radiation in the visible light wavelengths is emitted steadily and constantly from the sun.
- Radiation in the short extreme ultraviolet (EUV) range is most likely to have the widest variation.

Brief explanation: Visible light comes from the relatively stable photosphere and only changes by ~0.1% over the solar cycle, whereas short-wavelength EUV (and X-ray) emission from the active chromosphere/corona varies strongly with magnetic activity and flares, often by large factors.