Observations of Twist, Current Helicity, and Writhe in the Magnetic Knots of δ-sunspots Consistent with the Kink Instability of a Highly Twisted Flux Rope

Autor: Peter J. Levens, Aimee A. Norton, Mark G. Linton, Kalman J. Knizhnik, Yang Liu

Publikováno v: The Astrophysical Journal Letters, Vol 954, Iss 1, p L20 (2023)

We measure current helicity ( H _r ^c ) as well as proxies for twist ( α _r ) and writhe ( W ) in the isolated magnetic knots of three delta ( δ )-sunspots and report that the observations are consistent with a kink instability acting on a highly t

Externí odkaz: https://doaj.org/article/ecbb6acaf6a143598a2e536f8b7ed74c

α/β-Hydrolase domain-6 and saturated long chain monoacylglycerol regulate insulin secretion promoted by both fuel and non-fuel stimuli

Autor: Shangang Zhao, Pegah Poursharifi, Yves Mugabo, Emily J. Levens, Kevin Vivot, Camille Attane, Jose Iglesias, Marie-line Peyot, Erik Joly, S.R. Murthy Madiraju, Marc Prentki

Publikováno v: Molecular Metabolism, Vol 4, Iss 12, Pp 940-950 (2015)

Objective: α/β-Hydrolase domain-6 (ABHD6) is a newly identified monoacylglycerol (MAG) lipase. We recently reported that it negatively regulates glucose stimulated insulin secretion (GSIS) in the β cells by hydrolyzing lipolysis-derived MAG that a

Externí odkaz: https://doaj.org/article/e5610cda190f46468b9fa1ed0a75430a

Comparing UV/EUV line parameters and magnetic field in a quiescent prominence with tornadoes

Autor: Nicolas Labrosse, A. López Ariste, Brigitte Schmieder, Lyndsay Fletcher, P. J. Levens

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 607, pp.A16. ⟨10.1051/0004-6361/201730808⟩
Astronomy and Astrophysics-A&A, 2017, 607, pp.A16. ⟨10.1051/0004-6361/201730808⟩

Context. Understanding the close relationship between the plasma and the magnetic field is important to describe and explain the observed complex dynamics of solar prominences. Aims. We determine if a close relationship between plasma and magnetic fi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b3f6b0bfeeeb3b6c05a7dd65a2a74a77
https://eprints.gla.ac.uk/145946/7/145946.pdf

Hα Doppler shifts in a tornado in the solar corona

Autor: P. J. Levens, N. Mein, Brigitte Schmieder, Pierre Mein, Nicolas Labrosse, Leon Ofman

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 597, pp.A109. ⟨10.1051/0004-6361/201628771⟩
Astronomy and Astrophysics-A&A, 2017, 597, pp.A109. ⟨10.1051/0004-6361/201628771⟩

Context. High resolution movies in 193 Å from the Atmospheric Imaging Assembly (AIA) on the Solar Dynamic Observatory (SDO) show apparent rotation in the leg of a prominence observed during a coordinated campaign. Such structures are commonly referr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c6a9d2e13debf872a028c61d3669650
https://hal.archives-ouvertes.fr/hal-02266764

MAGNETIC FIELD IN ATYPICAL PROMINENCE STRUCTURES: BUBBLE, TORNADO, AND ERUPTION

Autor: Nicolas Labrosse, Brigitte Schmieder, B. Gelly, Kévin Dalmasse, P. J. Levens, A. López Ariste

Publikováno v: The Astrophysical Journal
The Astrophysical Journal, American Astronomical Society, 2016, 826 (2), pp.164. ⟨10.3847/0004-637X/826/2/164⟩
The Astrophysical Journal, 2016, 826 (2), pp.164. ⟨10.3847/0004-637X/826/2/164⟩

Spectropolarimetric observations of prominences have been obtained with the THEMIS telescope during four years of coordinated campaigns. Our aim is now to understand the conditions of the cool plasma and magnetism in `atypical' prominences, namely wh

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6ebb75ccbae6db236023b643d34e113e
https://hal.archives-ouvertes.fr/hal-02460569