Search Publications
Prediction of Geomagnetic Storm Strength from Inner Heliospheric In Situ Observations
Feng, L.; Möstl, C.; Eastwood, J. P. +4 more
Prediction of the effects of coronal mass ejections (CMEs) on Earth strongly depends on knowledge of the interplanetary magnetic field southward component, B z . Predicting the strength and duration of B z inside a CME with sufficient accuracy is currently impossible, forming the so-called B z problem. Here, w…
Cosmic microwave background and inflation in multi-fractional spacetimes
Calcagni, Gianluca; Kuroyanagi, Sachiko; Tsujikawa, Shinji
We use FIRAS and PLANCK 2015 data to place observational bounds on inflationary scenarios in multi-fractional spacetimes with q-derivatives. While a power-law expansion in the geometric time coordinate is subject to the usual constraints from the tensor-to-scalar ratio, model-independent best fits of the black-body and scalar spectra yield upper l…
Integrated approach to cosmology: Combining CMB, large-scale structure, and weak lensing
Amara, Adam; Refregier, Alexandre; Nicola, Andrina
Recent observational progress has led to the establishment of the standard Λ CDM model for cosmology. This development is based on different cosmological probes that are usually combined through their likelihoods at the latest stage in the analysis. We implement here an integrated scheme for cosmological probes, which are combined in a common fram…
Measuring the Magnetic Field of Coronal Mass Ejections Near the Sun Using Pulsars
White, S. M.; Taylor, G. B.; Howard, T. A. +2 more
The utility of Faraday rotation to measure the magnetic field of the solar corona and large-scale transients within is a small, yet growing field in solar physics. This is largely because it has been recognized as a potentially valuable frontier in space weather studies, because the ability to measure the intrinsic magnetic field within coronal ma…
Annual Cosmic Ray Spectra from 250 MeV up to 1.6 GeV from 1995 - 2014 Measured with the Electron Proton Helium Instrument onboard SOHO
Gómez-Herrero, R.; Heber, B.; Kühl, P.
The solar modulation of galactic cosmic rays (GCR) can be studied in detail by examining long-term variations of the GCR energy spectrum (e.g. on the scales of a solar cycle). With almost 20 years of data, the Electron Proton Helium INstrument (EPHIN) onboard the SOlar and Heliospheric Observatory (SOHO) is well suited for this kind of investigati…
Multi-wavelength characterisation of z ~ 2 clustered, dusty star-forming galaxies discovered by Planck
Le Floc'h, E.; Dole, H.; Lagache, G. +9 more
We report the discovery of PHz G95.5-61.6, a complex structure detected in emission in the Planck all-sky survey that corresponds to two over-densities of high-redshift (I.e. z> 1) galaxies. This is the first source from the Planck catalogue of high-z candidates (proto-clusters and lensed systems) that has been completely characterised with fol…
Cosmic microwave background reconstruction from WMAP and Planck PR2 data
Starck, J. -L.; Sureau, F.; Bobin, J.
We describe a new estimate of the cosmic microwave background (CMB) intensity map reconstructed by a joint analysis of the full Planck 2015 data (PR2) and nine years of WMAP data. The proposed map provides more than a mere update of the CMB map introduced in a previous paper since it benefits from an improvement of the component separation method …
A Three-dimensional Model of Active Region 7986: Comparison of Simulations with Observations
Downs, Cooper; Linker, Jon A.; Mikić, Zoran +2 more
In the present study, we use a forward modeling method to construct a 3D thermal structure encompassing active region 7986 of 1996 August. The extreme ultraviolet (EUV) emissions are then computed and compared with observations. The heating mechanism is inspired by a theory on Alfvén wave turbulence dissipation. The magnetic structure is built fro…
Dione and Rhea seasonal exospheres revealed by Cassini CAPS and INMS
Waite, J. H.; Teolis, B. D.
A Dione O2 and CO2 exosphere of similar composition and density to Rhea's is confirmed by Cassini spacecraft Ion Neutral Mass Spectrometer (INMS) flyby data. INMS results from three Dione and two Rhea flybys show exospheric spatial and temporal variability indicative of seasonal exospheres, modulated by winter polar gas adsor…
A variable ULX and possible IMBH candidate in M51a
Done, Chris; Middleton, Matthew J.; Sutton, Andrew D. +7 more
Ultraluminous X-ray source (ULX)-7, in the northern spiral arm of M51, demonstrates unusual behaviour for an ULX, with a hard X-ray spectrum but very high short-term variability. This suggests that it is not in a typical ultraluminous state. We analyse the source using archival data from XMM-Newton, Chandra and NuSTAR, and by examining optical and…