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A Critical Evaluation of Recent Claims Concerning Solar Rotation
- Publication Year :
- 2019
- Publisher :
- arXiv, 2019.
-
Abstract
- Fossat et al. (2017) recently reported detecting rotational splitting of g modes indirectly via the interaction with p modes observed directly by the GOLF instrument on SOHO. They concluded that the core of the Sun is rotating 3:8 ? 0:1 times faster than the surrounding radiative envelope. This is startling, partly because such rapid rotation almost contradicts direct inferences from the p-mode rotational splitting inferred from the same data. Moreover, the inferred amplitudes of the g modes appear to exceed the upper bound reported by Appourchaux et al. (2010). It is also suspect because the theory of the procedure implies that the principal modes claimed to have been measured should be undetectable. We point out that there are other interpretations: one leads to a core rotation about twice faster than the surrounding envelope; another, to a core rotating more slowly than the envelope. Here we also report on an independent assessment of the Fossat et al. analysis by applying their procedure to different representations of the GOLF data, expanding on Schunker et al. (2018). We also analyze seismic data obtained from LOI and MDI (both also on SOHO), from HMI (on SDO) and from the ground-based BiSON and GONG, and found the evidence reported by Fossat et al. not to be robust. We also illustrate that merely fitting model spectra to observations, which Fossat et al. do to support their g-mode detections and as Fossat & Schmider (2018) do for extracting additional g-mode splittings, is not necessarily reliable. We are therefore led to doubt the claim.<br />To be published in Astrophysical Journal, 20 pages, 11 figures of which 4 have two graphs
- Subjects :
- Physics
010504 meteorology & atmospheric sciences
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
Rotation
01 natural sciences
Upper and lower bounds
Spectral line
Amplitude
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
Observatory
0103 physical sciences
Radiative transfer
Solar rotation
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
0105 earth and related environmental sciences
Envelope (waves)
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....d5ab6f046cf2e4a89402a19096b9f4f3
- Full Text :
- https://doi.org/10.48550/arxiv.1904.02820