5k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR146 papers
- California Institute of TechnologyUS136 papers
- Goddard Space Flight CenterUS133 papers
- European Space Research and Technology CentreNL128 papers
- University of GenevaCH125 papers
- University of OsloNO124 papers
- National Institute for AstrophysicsIT122 papers
- Université Paris CitéFR122 papers
- University College LondonGB122 papers
- Jet Propulsion LaboratoryUS121 papers
- Université Paris-SaclayFR121 papers
- Astrophysique, Instrumentation et ModélisationFR120 papers
21 papers · 1 filter
An Efficient Algorithm for Non-Negative Matrix Factorization with Random Projections
Gabriele Torre, Michael Graber
Non-negative matrix factorization (NMF) is one of the most popular decomposition techniques for multivariate data. NMF is a core method for many machine-learning related computatio…
First analysis of solar structures in 1.21 mm full-disc ALMA image of the Sun
R. Brajša, D. Sudar, A. O. Benz +11
Various solar features can be seen on maps of the Sun in the mm and sub-mm wavelength range. The recently installed Atacama Large Millimeter/submillimeter Array (ALMA) is capable o…
First NuSTAR Limits on Quiet Sun Hard X-Ray Transient Events
Andrew J. Marsh, David M. Smith, Lindsay Glesener +16
We present the first results of a search for transient hard X-ray (HXR) emission in the quiet solar corona with the \textit{Nuclear Spectroscopic Telescope Array} (\textit{NuSTAR})…
A Statistical Study of Photospheric Magnetic Field Changes During 75 Solar Flares
J. S. Castellanos Durán, L. Kleint, B. Calvo-Mozo
Abrupt and permanent changes of photospheric magnetic fields have been observed during solar flares. The changes seem to be linked to the reconfiguration of magnetic fields, but th…
A Compressed Sensing-based Image Reconstruction Algorithm for Solar Flare X-Ray Observations
Simon Felix, Roman Bolzern, Marina Battaglia
One way of imaging X-ray emission from solar flares is to measure Fourier components of the spatial X-ray source distribution. We present a new Compressed Sensing-based algorithm n…
On the nature of off-limb flare continuum sources detected by SDO/HMI
P. Heinzel, L. Kleint, J. Kasparova +1
The Helioseismic and Magnetic Imager onboard the Solar Dynamics Observatory has provided unique observations of off-limb flare emission. White-light (WL) continuum enhancements wer…
Data processing pipeline for Herschel HIFI
R. F. Shipman, S. F. Beaulieu, D. Teyssier +26
{Context}. The HIFI instrument on the Herschel Space Observatory performed over 9100 astronomical observations, almost 900 of which were calibration observations in the course of t…
Internet of Tangible Things (IoTT): Challenges and Opportunities for Tangible Interaction with IoT
Leonardo Angelini, Nadine Couture, Omar Abou Khaled +1
In the Internet of Things era, an increasing number of household devices and everyday objects are able to send to and retrieve information from the Internet, offering innovative se…
Order out of Randomness : Self-Organization Processes in Astrophysics
Markus J. Aschwanden, Felix Scholkmann, William Bethune +13
Self-organization is a property of dissipative nonlinear processes that are governed by an internal driver and a positive feedback mechanism, which creates regular geometric and/or…
NuSTAR hard X-ray observation of a sub-A class solar flare
Lindsay Glesener, Sa"m Krucker, Iain G. Hannah +5
We report a NuSTAR observation of a solar microflare, SOL2015-09-01T04. Although it was too faint to be observed by the GOES X-ray Sensor, we estimate the event to be an A0.1 class…
Microflare Heating of a Solar Active Region Observed with NuSTAR, Hinode/XRT, and SDO/AIA
Paul J. Wright, Iain G. Hannah, Brian W. Grefenstette +7
NuSTAR is a highly sensitive focusing hard X-ray (HXR) telescope and has observed several small microflares in its initial solar pointings. In this paper, we present the first join…
The Solar X-ray Limb
Marina Battaglia, Hugh S. Hudson, Gordon J. Hurford +2
We describe a new technique to measure the height of the X-ray limb with observations from occulted X-ray flare sources as observed by the RHESSI (the Reuven Ramaty High-Energy Spe…
Non-Equilibrium Processes in the Solar Corona, Transition Region, Flares, and Solar Wind \textit{(Invited Review)}
Jaroslav Dudík, Elena Dzifčáková, Nicole Meyer-Vernet +12
We review the presence and signatures of the non-equilibrium processes, both non-Maxwellian distributions and non-equilibrium ionization, in the solar transition region, corona, so…
JHelioviewer - Time-dependent 3D visualisation of solar and heliospheric data
D. Mueller, B. Nicula, S. Felix +9
Context. Solar observatories are providing the world-wide community with a wealth of data, covering large time ranges, multiple viewpoints, and returning large amounts of data. In…
A parameter study for modeling MgII h and k emission during solar flares
Fatima Rubio da Costa, Lucia Kleint
Solar flares show highly unusual spectra, in which the thermodynamic conditions of the solar atmosphere are encoded. Current models are unable to fully reproduce the spectroscopic…
On the origin of the flare emission in IRIS' SJI 2832 filter: Balmer continuum or spectral lines?
Lucia Kleint, Petr Heinzel, Säm Krucker
Continuum ("White-light", WL) emission dominates the energetics of flares. Filter-based observations, such as the IRIS SJI 2832 filter, show WL-like brightenings during flares, but…
Fermi-LAT Observations of High-energy Behind-the-limb Solar Flares
M. Ackermann, A. Allafort, L. Baldini +86
We report on the Fermi-LAT detection of high-energy emission from the behind-the-limb (BTL) solar flares that occurred on 2013 October 11, and 2014 January 6 and September 1. The F…
Measuring X-ray anisotropy in solar flares. Prospective stereoscopic capabilities of STIX and MiSolFA
Diego Casadei, Natasha L. S. Jeffrey, Eduard P. Kontar
During the next solar maximum, two upcoming space-borne X-ray missions, STIX on board Solar Orbiter and MiSolFA, will perform stereoscopic X-ray observations of solar flares at two…
The Euclid Data Processing Challenges
Pierre Dubath, Nikolaos Apostolakos, Andrea Bonchi +37
Euclid is a Europe-led cosmology space mission dedicated to a visible and near infrared survey of the entire extra-galactic sky. Its purpose is to deepen our knowledge of the dark…
Evidence of Significant Energy Input in the Late Phase of a Solar Flare from NuSTAR X-Ray Observations
Matej Kuhar, Säm Krucker, Iain G. Hannah +15
We present observations of the occulted active region AR12222 during the third {\em NuSTAR} solar campaign on 2014 December 11, with concurrent {\em SDO/}AIA and {\em FOXSI-2} soun…
Mutual Information and Optimality of Approximate Message-Passing in Random Linear Estimation
Jean Barbier, Nicolas Macris, Mohamad Dia +1
We consider the estimation of a signal from the knowledge of its noisy linear random Gaussian projections. A few examples where this problem is relevant are compressed sensing, spa…