Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
, 263 (5143), 64-6

New Light on the Heart of Darkness of the Solar Chromosphere

New Light on the Heart of Darkness of the Solar Chromosphere

S K Solanki et al. Science.


Solar carbon monoxide spectra indicate the existence of a cool (less than 4000 kelvin) component to the solar chromosphere coexisting with the hot, bright gas at 6000 to 7000 kelvin. However, both the existence and the location of the cool component have been controversial. New high-resolution spectra show that carbon monoxide goes into emission just beyond the limb, allowing it to be probed without photospheric contamination. The cool component has temperatures as low as 3000 to 3500 kelvin and appears to cover 50 to 85 percent of the quiet solar surface. There is a steep temperature rise to normal chromospheric temperatures at a height of 900 to 1100 kilometers. Large horizontal velocities are seen, suggesting that the cool component is maintained by the supersonic adiabatic expansion of upwelling gas in overshooting granules.

Similar articles

See all similar articles

Cited by 1 PubMed Central articles

  • Infrared Solar Physics
    MJ Penn. Living Rev Sol Phys 11, 2. PMID 27194956. - Review
    The infrared solar spectrum contains a wealth of physical data about our Sun, and is explored using modern detectors and technology with new ground-based solar telescopes …

LinkOut - more resources