16 research outputs found
A Helicity-Based Method to Infer the CME Magnetic Field Magnitude in Sun and Geospace: Generalization and Extension to Sun-Like and M-Dwarf Stars and Implications for Exoplanet Habitability
Patsourakos et al. (Astrophys. J. 817, 14, 2016) and Patsourakos and
Georgoulis (Astron. Astrophys. 595, A121, 2016) introduced a method to infer
the axial magnetic field in flux-rope coronal mass ejections (CMEs) in the
solar corona and farther away in the interplanetary medium. The method, based
on the conservation principle of magnetic helicity, uses the relative magnetic
helicity of the solar source region as input estimates, along with the radius
and length of the corresponding CME flux rope. The method was initially applied
to cylindrical force-free flux ropes, with encouraging results. We hereby
extend our framework along two distinct lines. First, we generalize our
formalism to several possible flux-rope configurations (linear and nonlinear
force-free, non-force-free, spheromak, and torus) to investigate the dependence
of the resulting CME axial magnetic field on input parameters and the employed
flux-rope configuration. Second, we generalize our framework to both Sun-like
and active M-dwarf stars hosting superflares. In a qualitative sense, we find
that Earth may not experience severe atmosphere-eroding magnetospheric
compression even for eruptive solar superflares with energies ~ 10^4 times
higher than those of the largest Geostationary Operational Environmental
Satellite (GOES) X-class flares currently observed. In addition, the two
recently discovered exoplanets with the highest Earth-similarity index, Kepler
438b and Proxima b, seem to lie in the prohibitive zone of atmospheric erosion
due to interplanetary CMEs (ICMEs), except when they possess planetary magnetic
fields that are much higher than that of Earth.Comment: http://adsabs.harvard.edu/abs/2017SoPh..292...89
Longitudinal assessment of optic nerve head changes using optical coherence tomography in a primate microbead model of ocular hypertension
10.1038/s41598-020-71555-0Scientific Reports1011470
Demonstration of Angle Widening Using EyeCam After Laser Peripheral Iridotomy in Eyes With Angle Closure
10.1016/j.ajo.2010.01.013American Journal of Ophthalmology1496903-90
In vivo three-dimensional lamina cribrosa strains in healthy, ocular hypertensive, and glaucoma eyes following acute intraocular pressure elevation
10.1167/iovs.17-21982Investigative Ophthalmology and Visual Science591260-27
Novel anterior-chamber angle measurements by high-definition optical coherence tomography using the Schwalbe line as the landmark
10.1136/bjo.2010.189217British Journal of Ophthalmology957955-959BJOP
Variation of peripapillary scleral shape with age
10.1167/iovs.19-26777Investigative Ophthalmology and Visual Science60103275-328
Automated Detection of Iris Furrows and their Influence on Dynamic Iris Volume Change
10.1038/s41598-017-18039-wScientific Reports711789
Improvement of GaN light-emitting diodes with surface-treated Al-doped ZnO transparent Ohmic contacts by holographic photonic crystal
10.1007/s00339-012-6874-xApplied Physics A: Materials Science and Processing1074809-812APAM