New window for spectroscopy
Article Abstract:
The development of an imaging polarimeter system that routinely record the Sun's spectrum with 10 to -5th power precision in the degree of polarization is reported. The device is structurally richer than that of the ordinary, unpolarized spectrum due to its ability to record the linear polarization of the whole solar spectrum. The system based on charge-coupled device (OCD) uses piezoelastic modulation at 42- and 84-kHz rates and demodulates signals within OCD sensor. The solar spectrum is characterized by molecular scattering, quantum interference, hyperfine structure and isotope effects.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
User Contributions:
Comment about this article or add new information about this topic:
Resolution of magnetic flux tubes on the Sun
Article Abstract:
Magnetic flux tubes on the Sun's surface have been observed in detail for the first time. A new method of speckle interferometry has overcome the tubes' small size and the turbulence in the Earth's atmosphere that have hitherto limited scrutiny of these structures, which are important in the heating of the Sun's outer atmosphere. Separate flux tubes are about 200 kilometers in diameter and have a continuum brightness contrast of at least +30%. White-light and magnetic field signatures were obtained.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
User Contributions:
Comment about this article or add new information about this topic:
Hidden magnetism
Article Abstract:
Magnetic fields have occupied centre stage in solar physics is regarded as the key ingredients for a unified understanding of solar phenomena. The observations of the Hanle effects have revealed the existence of smallscale 'hidden' magnetic flux on the quiet Sun and the magnetic-energy of this hidden flux was found to be much larger.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: New spectroscopic frontiers. Turning on quantum taps. Quantum cryptography on multi-user optical fibre networks
- Abstracts: Doors open in the private sector. Human frontiers in rough water. What frontiers for Frontier?
- Abstracts: Not the earliest solar eclipse. Free oscillations illuminate the mantle. Darkness can illuminate
- Abstracts: Radon and rock deformation. A deficit vanished. Role of pore fluids in the generation of seismic precursors to shear fracture
- Abstracts: Is it "oui or nous ne savons pas"? Europe's recalcitrant offshore island