Zobrazeno 1 - 10
of 384
pro vyhledávání: '"Allred J"'
Autor:
Kuridze, D., Mathioudakis, M., Heinzel, P., Koza, J., Morgan, H., Oliver, R., Kowalski, A. F., Allred, J. C.
Flare ribbons are bright manifestations of flare energy dissipation in the lower solar atmosphere. For the first time, we report on high-resolution imaging spectroscopy observations of flare ribbons situated off-limb in the H$\beta$ and Ca II 8542 {\
Externí odkaz:
http://arxiv.org/abs/2005.10924
Autor:
Polito, V., Testa, P., Allred, J., De Pontieu, B., Carlsson, M., Pereira, T. M. D., Gošić, M., Reale, F.
Publikováno v:
2018ApJ...856..178P
We present the results of 1D hydrodynamic simulations of coronal loops which are subject to nanoflares, caused by either in-situ thermal heating, or non-thermal electrons (NTE) beams. The synthesized intensity and Doppler shifts can be directly compa
Externí odkaz:
http://arxiv.org/abs/1804.05970
Recent observations from the Interface Region Imaging Spectrograph (IRIS) appear to show impulsive brightenings in high temperature lines, which when combined with simultaneous ground based observations in H$\alpha$, appear co-spatial to Ellerman Bom
Externí odkaz:
http://arxiv.org/abs/1701.04213
Autor:
Kuridze, D., Mathioudakis, M., Christian, D. J., Kowalski, A. F., Jess, D. B., Grant, S. D. T., Kawate, T., Simões, P. J. A., Allred, J. C., Keenan, F. P.
We study the temporal evolution of the Na I D1 line profiles in the M3.9 flare SOL2014-06-11T21:03 UT, using high spectral resolution observations obtained with the IBIS instrument on the Dunn Solar Telescope combined with radiative hydrodynamic simu
Externí odkaz:
http://arxiv.org/abs/1609.08120
Autor:
Taddei, K. M., Allred, J. M., Bugaris, D. E., Lapidus, S. H., Krogstad, M. J., Stadel, R., Claus, H., Chung, D. Y., Kanatzidis, M. G., Rosenkranz, S., Osborn, R., Chmaissem, O.
The recently discovered $C_4$ tetragonal magnetic phase in hole-doped members of the iron-based superconductors provides new insights into the origin of unconventional superconductivity. Previously observed in Ba$_{1-x}A_x$Fe$_2$As$_2$ (with $A =$ K,
Externí odkaz:
http://arxiv.org/abs/1601.05693
Autor:
Kuridze, D., Mathioudakis, M., Simões, P. J. A., van der Voort, L. Rouppe, Carlsson, M., Jafarzadeh, S., Allred, J. C., Kowalski, A. F., Kennedy, M., Fletcher, L., Graham, D., Keenan, F. P.
The asymmetries observed in the line profiles of solar flares can provide important diagnostics of the properties and dynamics of the flaring atmosphere. In this paper the evolution of the Halpha and Ca II 8542 {\AA} lines are studied using high spat
Externí odkaz:
http://arxiv.org/abs/1510.01877
Autor:
Allred, J. M., Taddei, K. M., Bugaris, D. E., Krogstad, M. J., Lapidus, S. H., Chung, D. Y., Claus, H., Kanatzidis, M. G., Brown, D. E., Kang, J., Fernandes, R. M., Eremin, I., Rosenkranz, S., Chmaissem, O., Osborn, R.
Publikováno v:
Nature Physics 12, 493 (2016)
Elucidating the nature of the magnetic ground state of iron-based superconductors is of paramount importance in unveiling the mechanism behind their high temperature superconductivity. Until recently, it was thought that superconductivity emerges onl
Externí odkaz:
http://arxiv.org/abs/1505.06175
Autor:
Khalyavin, D. D., Lovesey, S. W., Manuel, P., Kruger, F., Rosenkranz, S., Allred, J. M., Chmaissem, O., Osborn, R.
Publikováno v:
Phys. Rev. B 90, 174511 (2014)
Magneto-structural phase transitions in Ba1-xAxFe2As2 (A = K, Na) materials are discussed for both magnetically and orbitally driven mechanisms, using a symmetry analysis formulated within the Landau theory of phase transitions. Both mechanisms predi
Externí odkaz:
http://arxiv.org/abs/1409.5324
Autor:
Airapetian, V. S., Allred, J.
Recent progress in obtaining high spatial resolution images of the solar corona in the extreme-ultraviolet (EUV) with Hinode, TRACE, SDO and recent Hi-C missions and soft X-ray (SXR) bands opened a new avenue in understanding the solar coronal heatin
Externí odkaz:
http://arxiv.org/abs/1409.3866
Autor:
Neupane, M., Xu, S. -Y., Wray, L. A., Petersen, A., Shankar, R., Alidoust, N., Liu, Chang, Fedorov, A., Ji, H., Allred, J. M., Hor, Y. S., Chang, T. -R., Jeng, H. -T., Lin, H., Bansil, A., Cava, R. J., Hasan, M. Z.
Publikováno v:
Phys. Rev. B 85, 235406 (2012)
Using angle-resolved photoemission spectroscopy, we report electronic structure for representative members of ternary topological insulators. We show that several members of this family, such as Bi2Se2Te, Bi2Te2Se, and GeBi2Te4, exhibit a singly dege
Externí odkaz:
http://arxiv.org/abs/1206.0695