Lately, a study group led by Dr.Li Yan from the Yunnan Observatories of the Chinese Academy of Sciences recommended a brand-new ways to discover the small electromagnetic fields in the solar environment via examining the regularities of the solar p-mode oscillations, and also discovered that the small magnetic covers can create a worldwide splicing layer in the solar photosphere, which has actually not been identified prior to. The outcomes were on-line released in the Astrophysical Journal.
In 1962, Leighton et al. discovered countless oscillations of durations around 5 mins on the solar photosphere. Monitorings and also theoretical studies have actually revealed that these oscillations are the eigenmodes of solar international oscillations comparable to standing sound waves, and also described as the solar p-mode oscillations.
Previous researches on the solar p-mode oscillations reveal that the computed regularities based upon the common solar versions drift methodically from the observed regularities of the equivalent oscillation settings, and also the biggest regularity discrepancy can be 20 μHz.
Given that the physical framework near the surface area of the sunlight impacts the high-frequency oscillation setting greater than the low-frequency one, this organized discrepancy is referred to as the near-surface result. Current researches recommended that the result of unstable convection on the physical framework around the solar photosphere could be in charge of this near-surface result. Excellent versions thinking about the result of unstable convection can lower the optimum discrepancy to regarding 3 μHz.
The small electromagnetic fields in the silent area of the solar disk are a vital constitution of the solar electromagnetic field. Because of their tiny dimensions, they cannot be seen in the usual solar magnetograms, and also are typically described as “covert electromagnetic fields.” The Solar Optical Telescope monitorings aboard the Hinode satellite program that the straight part has a balanced toughness of regarding 55 gauss and also the upright part has a regular toughness of around 11 gauss.
3D magneto-hydrodynamic simulations reveal that the convective activity can press the previously evenly dispersed electromagnetic field upwards, causing the development of flat magnetic bows at an elevation 400~500 kilometer over the base of the photosphere. These magnetic bows are occasionally described as the “small magnetic cover.”
In this job, the scientists presented the electromagnetic fields and also the magnetic stress right into the design of the solar environment, and also analyzed its result on the breeding of the solar p-mode oscillations in the solar environment by readjusting the area of the electromagnetic field and also the size of the magnetic stress.
It is discovered that the small magnetic covers exposed by the three-dimensional mathematical simulations cannot be arbitrarily dispersed in the solar atmosphere, yet instead to be interlaced with each other in the straight instructions to create a small magnetic cover layer.
Because of this, the magnetic area toughness will certainly boost when going cross this small magnetic cover layer, resulting in a fast increase in the magnetic stress and also the going along with fast decrease in the gas stress. The p-mode oscillation waves circulating from the inside of the sunlight will certainly be entirely mirrored at this area, therefore equivalently expanding the tooth cavity of the p-mode oscillations.
The scientists contrasted the academic regularities of the p-mode oscillations with the observed regularities of the equivalent settings, and also discovered that the optimum discrepancy is just around 0.5 μHz, which is better than the outcomes provided by various other versions. The presumed magnetic field strength has to do with 90 gauss, which follows the observed outcomes.
At the very same time, the elevation of the small magnetic cover layer reasoned from the present design has to do with 630 kilometers high in the photosphere, which follows the elevation of the small magnetic cover provided by some three-dimensional mathematical simulations.
The exploration of a small magnetic canopy layer not just breakthroughs a large action towards lastly resolving the enduring issue of the near-surface result of the solar p-mode oscillations, yet additionally gives an essential hint for additional understanding of the physical structure of the solar photosphere and also the beginning of the solar electromagnetic fields.
Yan Li et alia, Can Small-scale Magnetic Area Be the Significant Reason for the Near-surface Impact of the Solar p-mode Regularities?, The Astrophysical Journal (2021). DOI: 10.3847/1538-4357/ac0882
Chinese Academy of Sciences
Small magnetic covers can create a worldwide splicing layer in solar photosphere (2021, August 10)
obtained 11 August 2021
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