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The Instruments and Capabilities of the Miniature X-Ray Solar Spectrometer (MinXSS) CubeSats
Chamberlin, Phillip C.; Woods, Thomas N.; Caspi, Amir +6 more
The Miniature X-ray Solar Spectrometer (MinXSS) CubeSat is the first solar science oriented CubeSat mission flown for the NASA Science Mission Directorate, with the main objective of measuring the solar soft X-ray (SXR) flux and a science goal of determining its influence on Earth's ionosphere and thermosphere. These observations can also be used …
Physical Processes Involved in the EUV "Surge" Event of 9 May 2012
Démoulin, Pascal; Mandrini, Cristina H.; López Fuentes, Marcelo +4 more
We study an extreme ultraviolet (EUV) confined ejection observed on 9 May 2012 in Active Region (AR) NOAA 11476. For the analysis we use observations in multiple wavelengths (EUV, X-rays, Hα , and magnetograms) from a variety of ground- and space-based instruments. The magnetic configuration showed two rotating bipoles within the following polarit…
Dynamics of Trees of Fragmenting Granules in the Quiet Sun: Hinode/SOT Observations Compared to Numerical Simulation
Roudier, T.; Malherbe, J. -M.; Frank, Z. +1 more
We compare horizontal velocities, vertical magnetic fields, and the evolution of trees of fragmenting granules (TFG, also named families of granules) derived in the quiet Sun at disk center from observations at solar minimum and maximum of the Solar Optical Telescope (SOT on board Hinode) and results of a recent 3D numerical simulation of the magn…
On the Performance of Multi-Instrument Solar Flare Observations During Solar Cycle 24
Milligan, Ryan O.; Ireland, Jack
The current fleet of space-based solar observatories offers us a wealth of opportunities to study solar flares over a range of wavelengths. Significant advances in our understanding of flare physics often come from coordinated observations between multiple instruments. Consequently, considerable efforts have been, and continue to be, made to coord…
Probing the Quiet Solar Atmosphere from the Photosphere to the Corona
Gontikakis, Costis; Tziotziou, Kostas; Kontogiannis, Ioannis +1 more
We investigate the morphology and temporal variability of a quiet-Sun network region in different solar layers. The emission in several extreme ultraviolet (EUV) spectral lines through both raster and slot time-series, recorded by the EUV Imaging Spectrometer (EIS) on board the Hinode spacecraft is studied along with Hα observations and high-resol…
Flare-related Recurring Active Region Jets: Evidence for Very Hot Plasma
Del Zanna, Giulio; Shimizu, Toshifumi; Mulay, Sargam M. +3 more
We present a study of two active region jets (AR jets) that are associated with two C-class X-ray flares. The recurrent, homologous jets originated from the northern periphery of a sunspot. We confirm flare-like temperatures at the footpoints of these jets using spectroscopic observations of Fe XXIII (263.76 Å) and Fe XXIV (255.11 Å) emission line…
A Check on the Validity of Magnetic Field Reconstructions
Wheatland, M. S.; Gilchrist, S. A.; Mastrano, A.
We investigate a method to test whether a numerically computed model coronal magnetic field B departs from the divergence-free condition (also known as the solenoidality condition). The test requires a potential field B0 to be calculated, subject to Neumann boundary conditions, given by the normal components of the model field B at the …
Physical Properties of Umbral Dots Observed in Sunspots: A Hinode Observation
Mathew, Shibu K.; Yadav, Rahul
Umbral dots (UDs) are small-scale bright features observed in the umbral part of sunspots and pores. It is well established that they are manifestations of magnetoconvection phenomena inside umbrae. We study the physical properties of UDs in different sunspots and their dependence on decay rate and filling factor. We have selected high-resolution,…
Solar Microflares Observed by SphinX and RHESSI
Mrozek, Tomasz; Kepa, Anna; Sylwester, Barbara +4 more
In 2009, the Russian Complex Orbital Observations Near-Earth of Activity of the Sun (CORONAS-Photon) spacecraft was launched, carrying the Polish Solar PHotometer In X-rays (SphinX). The SphinX was most sensitive in the spectral range 1.2 - 15 keV, thus an excellent opportunity appeared for comparison with the low-energy end of Ramaty High Energy …
Small-Scale Activity Above the Penumbra of a Fast-Rotating Sunspot
Bharti, L.; Sobha, B.; Quintero Noda, C. +3 more
High-resolution observations of small-scale activity above the filamentary structure of a fast-rotating sunspot of NOAA Active Region 10930 are presented. The penumbral filament that intrudes into the umbra shows a central dark core and substructures. It almost approached another end of the umbra, like a light bridge. The chromospheric Ca II H ima…