by Staff Writers
Tokyo, Japan (SPX) May 19, 2017
For the first time in the world, scientists have explored the magnetic field in the upper solar atmosphere by observing the polarization of ultraviolet light from the Sun. They accomplished this by analyzing data taken by the CLASP sounding rocket experiment during its 5-minute flight in space on September 3, 2015.
The data show that the structures of the solar chromosphere and transition region are more complicated than expected. Now that ultraviolet spectropolarimetry, the method used in the CLASP project, has been proven to work, it can be used in future investigations of the magnetic fields in the upper chromosphere and the transition region to better understand activity in the solar atmosphere.
By analyzing the characteristics of light from the Sun, astronomers can determine how it has been emitted and scattered in the solar atmosphere, and thus determine the conditions in the solar atmosphere. Because magnetic fields are thought to play an important role in various types of solar activity, many precise measurements have been made of the magnetic fields at the solar surface ("photosphere"), but not so many observations have measured the magnetic fields in the solar atmosphere above the surface.
While visible light is emitted from the photosphere, ultraviolet (UV) light is emitted and scattered in the parts of the solar atmosphere known as the chromosphere and the transition region. CLASP is a project to investigate the magnetic fields in the upper chromosphere and the transition region, using the hydrogen Lyman-alpha line in UV.
The international team used data from the CLASP spectropolarimeter, an instrument which provides detailed wavelength (color) and polarization (orientation of the light waves) information for light passing through a thin slit.
The researchers discovered that the hydrogen Lyman-alpha line from the Sun is actually polarized. Some of the polarization characteristics match those predicted by the theoretical scattering models. However, others are unexpected, indicating that the structures of the upper chromosphere and transition region are more complicated than expected. In particular, the team discovered that polarization varied on a spatial scale of 10 to 20 arcsec (one hundredth to one fiftieth of the solar radius).
In addition to the scattering process, magnetic fields can also affect the polarization. To investigate if the measured polarization was affected by the magnetic field, the team observed 3 different wavelength ranges: the core of the hydrogen Lyman-alpha line (121.567 nm), whose polarization is affected by even a weak magnetic field; an ionized silicon emission line (120.65 nm) whose polarization is affected only by a relatively strong magnetic field; and the wing of the hydrogen Lyman-alpha spectral line, which is not sensitive to magnetically induced polarization changes.
The team analyzed these 3 polarizations above 4 regions on the solar surface with different magnetic fluxes. The results demonstrated that the large deviations from the expected scattering polarization in the Lyman-alpha core and the silicon line are in fact due to the magnetic fields, because the Lyman-alpha wing polarization remains almost constant.
These epoch-making results are the first to directly show that magnetic fields exist in the transition region. They also demonstrate that ultraviolet spectropolarimetry is effective in studying solar magnetic fields. Moreover, these results have shown that sounding rocket experiments like CLASP can play an important role in pioneering new techniques, even though they are small scale and short term compared to satellites.
Dr. Ryoko Ishikawa, project scientist for the Japanese CLASP team, describes the significance of the results, "The successful observation of polarization indicative of magnetic fields in the upper chromosphere and the transition region means that ultraviolet spectropolarimetry has opened a new window to such solar magnetic fields, allowing us to see new aspects of the Sun."
Research Report: "Discovery of Scattering Polarization in the Hydrogen Ly-alpha Line of the Solar Disk Radiation," R. Kano et al., 2017 Apr. 10, Astrophysical Journal Letters
Greenbelt MD (SPX) May 18, 2017
Our Cold War history is now offering scientists a chance to better understand the complex space system that surrounds us. Space weather - which can include changes in Earth's magnetic environment - are usually triggered by the sun's activity, but recently declassified data on high-altitude nuclear explosion tests have provided a new look at the mechansisms that set off perturbations in that magn ... read more
National Astronomical Observatory Of Japan
Solar Science News at SpaceDaily
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement|