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dc.contributor.authorCheung, Mark C.M.
dc.contributor.authorDe Pontieu, B.
dc.contributor.authorTarbell, Ted D.
dc.contributor.authorFu, Y.
dc.contributor.authorTian, Hui
dc.contributor.authorTesta, Paola
dc.contributor.authorReeves, Kathy K.
dc.contributor.authorMartínez-Sykora, J.
dc.contributor.authorBoerner, B.
dc.contributor.authorWülser, J.P.
dc.contributor.authorLemen, James
dc.contributor.authorTitle, Alan M.
dc.contributor.authorHurlburt, Neal E.
dc.contributor.authorKleint, Lucia
dc.contributor.authorKankelborg, Charles
dc.contributor.authorJaeggli, Sarah
dc.contributor.authorGolub, Leon
dc.contributor.authorMcKillop, Sean
dc.contributor.authorSaar, Steven
dc.contributor.authorCarlsson, Mats
dc.contributor.authorHansteen, Viggo H.
dc.identifier.citationCheung, Mark C. M., B. De Pontieu, T. D. Tarbell, Y. Fu, H. Tian, P. Testa, K. K. Reeves, et al. “Homologous Helical Jets: Observations By IRIS, SDO , AND Hinode and Magnetic Modeling with Data-Driven Simulations.” The Astrophysical Journal 801, no. 2 (March 5, 2015): 83. doi:10.1088/0004-37x/801/2/83.en_US
dc.description.abstractWe report on observations of recurrent jets by instruments on board the Interface Region Imaging Spectrograph, Solar Dynamics Observatory (SDO), and Hinode spacecraft. Over a 4 hr period on 2013 July 21, recurrent coronal jets were observed to emanate from NOAA Active Region 11793. Far-ultraviolet spectra probing plasma at transition region temperatures show evidence of oppositely directed flows with components reaching Doppler velocities of ±100 km s−1. Raster Doppler maps using a Si iv transition region line show all four jets to have helical motion of the same sense. Simultaneous observations of the region by SDO and Hinode show that the jets emanate from a source region comprising a pore embedded in the interior of a supergranule. The parasitic pore has opposite polarity flux compared to the surrounding network field. This leads to a spine-fan magnetic topology in the coronal field that is amenable to jet formation. Time-dependent data-driven simulations are used to investigate the underlying drivers for the jets. These numerical experiments show that the emergence of current-carrying magnetic field in the vicinity of the pore supplies the magnetic twist needed for recurrent helical jet formation.en_US
dc.description.sponsorshipData are courtesy of the science teams of IRIS, SDO, and Hinode. IRIS is a NASA small explorer mission developed and operated by LMSAL with mission operations executed at NASA Ames Research center and major contributions to downlink communications funded by the Norwegian Space Center (NSC, Norway) through an ESA PRODEX contract. This work is supported by NASA under contract NNG09FA40C (IRIS), the European Research Council grant agreement No. 291058, and contract 8100002705 from LMSAL to SAO. Additionally, M.C.M.C. acknowledges support from NASA’s SDO/AIA (NNG04EA00C) and Hinode/SOT (NNM07AA01C) contracts and grants (NNX14AI14G and NNX13AJ96G) to LMSAL. AIA is an instrument on board the Solar Dynamics Observatory, a mission for NASA’s Living With a Star program. Hinode is a Japanese mission developed and launched by ISAS/JAXA, collaborating with NAOJ as domestic partner, and NASA and STFC (UK) as international partners. Science operation of Hinode is conducted by the Hinode science team organized at ISAS/JAXA. Postlaunch operation support is provided by JAXA and NAOJ (Japan), STFC (UK), NASA, ESA, and NSC (Norway). The numerical modeling work is made possible by NASA’s High-End Computing Program. The simulations presented in this paper were carried out on the Pleiades cluster at the Ames Research Center.en_US
dc.titleHomologous Helical Jets: Observations By IRIS, SDO, and Hinode and Magnetic Modeling With Data‐Drivenen_US
mus.citation.journaltitleAstrophysical Journalen_US
mus.identifier.categoryPhysics & Mathematicsen_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.universityMontana State University - Bozemanen_US

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