Doppler Temperature of the Solar Corona

Hirschberg, Joseph; Wouters, A.; Fried, Walter; Cooke, Francis N.; Duke, Douglas; Read, Mike

doi:10.1038/2261142a0

Cited by 7 publications

(5 citation statements)

References 1 publication

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“…Among these was a large helmet streamer inclined 11 ~ northward (Teske et aL, 1970) associated with a prominence and a filament. Wavelength shifts and broadening (Hirschberg et aL, 1970) were observed which indicated a possible complex vortex structure associated with this streamer, in which a relatively cool system revolved about a hotter core.…”

Section: Resultsmentioning

confidence: 95%

Interferometric studies of spectral lines in the solar corona

1971

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Section: Resultsmentioning

confidence: 95%

Interferometric studies of spectral lines in the solar corona

1971

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“…While this Brillouin lidar technique for measuring ocean water features was proposed nearly a half century ago [30], a recent flurry of work [30][31][32][33][34][38][39][40][41][42][43][44][45] has been done on the ability of using Brillouin lidar to measure temperature, salinity, and sound speed. Various laboratories are developing benchtop instrumentation and testing the capability using select samples of ocean water.…”

Section: Discussionmentioning

confidence: 99%

“…Noted nearly a half century ago [33], it was observed that the wavelength of the energy obtained from Brillouin scattering [nm], λ B , varies as a function of the product of the index of refraction, the speed of sound in water, and the backscattering angle such that,…”

Section: Introductionmentioning

confidence: 99%

Ocean Temperature Profiling Lidar: Analysis of Technology and Potential for Rapid Ocean Observations

Moisan,

Rousseaux,

Stysley

et al. 2024

Remote Sensing

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Development of ocean measurement technologies can improve monitoring of the global Ocean Heat Content (OHC) and Heat Storage Rate (HSR) that serve as early-warning indices for climate-critical circulation processes such as the Atlantic Meridional Overturning Circulation and provide real-time OHC assessments for tropical cyclone forecast models. This paper examines the potential of remotely measuring ocean temperature profiles using a simulated Brillouin lidar for calculating ocean HSR. A series of data analysis (‘Nature’) and Observational Systems Simulation Experiments (OSSEs) were carried out using 26 years (1992–2017) of daily mean temperature and salinity outputs from the ECCOv4r4 ocean circulation model. The focus of this study is to compare various OSSEs carried out to measure the HSR using a simulated Brillouin lidar against the HSR calculated from the ECCOv4r4 model results. Brillouin lidar simulations are used to predict the probability of detecting a return lidar signal under varying sampling strategies. Correlations were calculated for the difference between sampling strategies. These comparisons ignore the measurement errors inherent in a Brillouin lidar. Brillouin lidar technology and instruments are known to contain numerous, instrument-dependent errors and remain an engineering challenge. A significant decrease in the ability to measuring global ocean HSRs is a consequence of measuring ocean temperature from nadir-pointing instruments that can only take measurements along-track. Other sources of errors include the inability to fully profile ocean regions with deep mixed layers, such as the Southern Ocean and North Atlantic, and ocean regions with high light attenuation levels.

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“…During the eclipse in 1970 Hirschberg and Wouters (1970) conducted observations in line 25303 with the help of the Fabry-Perot interferometer. In their observations Hirschberg and Wouters registered considerable velocities in the northwestern part of the corona.…”

Section: White-light Coronamentioning

confidence: 99%