THz solar observations on board of a trans-Antarctic stratospheric balloon flight

Kaufmann, P.; Abrantes, A.; Bortolucci, E. C.; Caspi, Amir; Fernandes, L. O. T.; Кропотов, Г. И.; Kudaka, A. S.; Laurent, G. T.; Machado, Nelson; Marcon, R.; Marun, A.; Nicolaev, V.; Ramirez, R. F. Hidalgo; Raulin, J. P.; Saint-Hilaire, Pascal; Shih, Albert Y.; Silva, C. M.; Timofeevsky, Alexander

doi:10.1109/irmmw-thz.2016.7758395

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…The High‐Altitude THz Solar telescope, with first light expected in 2020, will observe the unexplored wavelength of 20 μm. Moreover, a spaceborne Solar‐T (Kaufmann et al, ), observing at 100 and 43 μm, is expected to fly during the new cycle 25.…”

Section: Discussionmentioning

confidence: 99%

The 6 September 2017 X9 Super Flare Observed From Submillimeter to Mid‐IR

et al. 2018

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Active Region 12673 is the most productive active region of solar cycle 24: in a few days of early September 2017, four X‐class and 27 M‐class flares occurred. SOL2017‐09‐06T12:00, an X9.3 flare also produced a two‐ribbon white light emission across the sunspot detected by Solar Dynamics Orbiter/Helioseismic and Magnetic Imager. The flare was observed at 212 and 405 GHz with the arcminute‐sized beams of the Solar Submillimeter Telescope focal array while making a solar map and at 10 μm, with a 17 arcsec diffraction‐limited infrared camera. Images at 10 μm revealed that the sunspot gradually increased in brightness while the event proceeded, reaching a temperature similar to quiet Sun values. From the images we derive a lower bound limit of 180‐K flare peak excess brightness temperature or 7,000 sfu if we consider a similar size as the white light source. The rising phase of mid‐IR and white light is similar, although the latter decays faster, and the maximum of the mid‐IR and white light emission is ∼200 s delayed from the 15.4‐GHz peak occurrence. The submillimeter spectrum has a different origin than that of microwaves from 1 to 15 GHz, although it is not possible to draw a definitive conclusion about its emitting mechanism.

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Section: Discussionmentioning

confidence: 99%

The 6 September 2017 X9 Super Flare Observed From Submillimeter to Mid‐IR

et al. 2018

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“…THz spectroscopy and imaging are widely used for the investigation of biological samples [1][2][3][4][5][6] and medical research [7][8][9][10], environmental monitoring [11][12][13][14][15][16], chemical analysis [17][18][19], communication [20][21][22][23][24], flaw detection [25,26], security applications (detection of explosives, narcotic drugs or dangerous objects under clothing,) [27][28][29], and paintwork studies [30][31][32]. Changing the polarization of initially non-polarized THz waves is a standard task in THz devices.…”

Section: Introductionmentioning

confidence: 99%

A Terahertz Radiation Linear Polarizer Based on Using a Magnetic Fluid in an External Magnetic Field

Votintsev,

Borisov,

Kochnev

et al. 2023

Photonics

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A model of a magnetically controlled linear polarizer of terahertz (THz) waves based on a cell filled with a magnetic fluid and controlled by an external magnetic field was proposed. The magnetic fluid consisted of a synthetic oil with high transparency in the THz range and ferromagnetic alloy microparticles. Selection of the ferromagnetic particles size and concentration, and also parameters of the external magnetic field was conducted. It was shown that when using ferromagnetic particles of 10–35 μm size, a concentration of 10 wt.%, and a magnetic field with induction of 6.7–57.2 mT, the created construction works as a linear polarizer of the THz wave in the ranged from 0.3 to 1.5 THz, with the degree of polarization of the initially non-polarized THz wave transmitted through the cell being at least of 80%.

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