The solar transition region, located between the chromosphere and corona, plays a vital role in the formation of solar wind and the mechanism of coronal heating. Unlike a static layered structure, the solar transition region is a dynamic region characterized by an uneven magnetic field and plasma structure.
Rotation is a crucial factor in the generation and evolution of the solar magnetic field. While previous studies have focused on the photosphere, chromosphere, and corona, there is limited research on the rotation of the solar transition region.
Zhang Xiaojuan, a Ph.D. Candidate, and Prof. Deng Linhua from Yunnan Observatories of the Chinese Academy of Sciences (CAS) conducted a study on the rotation period, secular trend, and its relationship with the solar cycle in the solar transition region. The study utilized Lyα spectral line irradiance data from 1947 to 2022 and was published in The Astrophysical Journal Letters on June 27, 2023.
The researchers discovered that the rotation period in the low transition region varied from 19.25 to 31.25 days, with an average of 25.45 days. The range of rotation period length was similar to that of the photosphere and corona. For example, the photospheric rotation period ranged from 21.0 to 30.3 days, while the coronal rotation period ranged from 19.0 to 29.5 days.
Additionally, the study revealed a continuous downward trend in the global rotation of the low transition region, indicating an increase in rotation rate. This secular feature could be attributed to the weakening of the solar global magnetic field and a decrease in heliospheric environmental pressure.
More information:
Xiaojuan Zhang et al, Temporal Variation of the Rotation in the Solar Transition Region, The Astrophysical Journal Letters (2023). DOI: 10.3847/2041-8213/acd9a3
Citation:
Researchers investigate rotation in the solar transition region (2023, July 13)
retrieved 14 July 2023
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