Search Publications
The Hinode Spectro-Polarimeter
Kubo, M.; Lites, B. W.; Ichimoto, K. +16 more
The joint Japan/US/UK Hinode mission includes the first large-aperture visible-light solar telescope flown in space. One component of the Focal Plane Package of that telescope is a precision spectro-polarimeter designed to measure full Stokes spectra with the intent of using those spectra to infer the magnetic-field vector at high precision in the…
Hot Spine Loops and the Nature of a Late-phase Solar Flare
Liu, Yang; Aulanier, Guillaume; Sun, Xudong +4 more
The fan-spine magnetic topology is believed to be responsible for many curious features in solar explosive events. A spine field line links distinct flux domains, but direct observation of such a feature has been rare. Here we report a unique event observed by the Solar Dynamic Observatory where a set of hot coronal loops (over 10 MK) connected to…
The multi-thermal emission in solar active regions
Del Zanna, G.
We present simultaneous SDO AIA and Hinode EIS observations of the hot cores of active regions (ARs) and assess the dominant contributions to the AIA EUV bands. This is an extension of our previous work. We find good agreement between SDO AIA, EVE and EIS observations, using our new EIS calibration and the latest EVE v.3 data. We find that all the…
Magnetohydrodynamic Modeling of the Solar Eruption on 2010 April 8
van Ballegooijen, A. A.; DeLuca, E. E.; Kliem, B. +1 more
The structure of the coronal magnetic field prior to eruptive processes and the conditions for the onset of eruption are important issues that can be addressed through studying the magnetohydrodynamic (MHD) stability and evolution of nonlinear force-free field (NLFFF) models. This paper uses data-constrained NLFFF models of a solar active region (…
The Cool Component and the Dichotomy, Lateral Expansion, and Axial Rotation of Solar X-Ray Jets
Moore, Ronald L.; Sterling, Alphonse C.; Falconer, David A. +1 more
We present results from a study of 54 polar X-ray jets that were observed in coronal X-ray movies from the X-ray Telescope on Hinode and had simultaneous coverage in movies of the cooler transition region (T ~ 105 K) taken in the He II 304 Å band of the Atmospheric Imaging Assembly (AIA) on Solar Dynamics Observatory. These dual observa…
Observing Coronal Nanoflares in Active Region Moss
Golub, Leon; Testa, Paola; Martínez-Sykora, Juan +12 more
The High-resolution Coronal Imager (Hi-C) has provided Fe XII 193Å images of the upper transition region moss at an unprecedented spatial (~0.''3-0.''4) and temporal (5.5 s) resolution. The Hi-C observations show in some moss regions variability on timescales down to ~15 s, significantly shorter than the minute-scale variability typically found in…
The Formation of IRIS Diagnostics. III. Near-ultraviolet Spectra and Images
De Pontieu, B.; Leenaarts, J.; Carlsson, M. +2 more
The Mg II h&k lines are the prime chromospheric diagnostics of NASA's Interface Region Imaging Spectrograph (IRIS). In the previous papers of this series, we used a realistic three-dimensional radiative magnetohydrodynamics model to calculate the h&k lines in detail and investigated how their spectral features relate to the underlying atmo…
A Global Wave-driven Magnetohydrodynamic Solar Model with a Unified Treatment of Open and Closed Magnetic Field Topologies
Gombosi, T. I.; Landi, E.; Jin, M. +3 more
We describe, analyze, and validate the recently developed Alfvén Wave Solar Model, a three-dimensional global model starting from the top of the chromosphere and extending into interplanetary space (out to 1-2 AU). This model solves the extended, two-temperature magnetohydrodynamics equations coupled to a wave kinetic equation for low-frequency Al…
A revised radiometric calibration for the Hinode/EIS instrument
Del Zanna, G.
An assessment of the in-flight radiometric calibration of the Hinode EUV Imaging Spectrometer (EIS) is presented. This is done with the line ratio technique applied to a wide range of observations of the quiet Sun, active regions, and flares from 2006 until 2012. The best diagnostic lines and the relevant atomic data are discussed in detail. Radia…
The SP_PREP Data Preparation Package for the Hinode Spectro-Polarimeter
Lites, B. W.; Ichimoto, K.
The Hinode/Spectro-Polarimeter (SP) is the first space-borne precision spectro-polarimeter for the study of solar phenomena. It is primarily intended for measuring the solar photospheric vector magnetic field at high spatial and spectral resolution. This objective requires that the data are calibrated and conditioned to a high degree of precision.…