Search Publications
The Solar Wind Charge-eXchange Contribution to the Local Soft X-ray Background. Model to Data Comparison in the 0.1-1.0 keV Band
Lallement, Rosine; Koutroumpa, Dimitra; Kharchenko, Vasili +1 more
The major sources of the Soft X-ray Background (SXRB), besides distinct structures as supernovae and superbubbles (e.g. Loop I), are: (i) an absorbed extragalactic emission following a power law, (ii) an absorbed thermal component (∼2×106 K) from the galactic disk and halo, (iii) an unabsorbed thermal component, supposedly at 106
Solar Weather Event Modelling and Prediction
Noci, Giancarlo; Messerotti, Mauro; Bothmer, Volker +5 more
Key drivers of solar weather and mid-term solar weather are reviewed by considering a selection of relevant physics- and statistics-based scientific models as well as a selection of related prediction models, in order to provide an updated operational scenario for space weather applications. The characteristics and outcomes of the considered scien…
Interstellar Dust Inside and Outside the Heliosphere
Krüger, Harald; Grün, Eberhard
In the early 1990s, after its Jupiter flyby, the Ulysses spacecraft identified interstellar dust in the solar system. Since then the in-situ dust detector on board Ulysses continuously monitored interstellar grains with masses up to 10-13 kg, penetrating deep into the solar system. While Ulysses measured the interstellar dust stream at …
Interplanetary Lyman α Observations: Intensities from Voyagers and Line Profiles from HST/STIS
Clarke, John T.; Lallement, Rosine; Quémerais, Eric +1 more
We present an analysis of Voyager UVS data obtained between 1993 and mid-2007. These data are used to study the interplanetary background and the hydrogen number density in the outer heliosphere. Two types of observations are studied, first the heliospheric scans performed until 2003 and then the fixed line of sight observations, close to the upwi…
Origin of the Local Bubble
Breitschwerdt, Dieter; de Avillez, Miguel A.; Fuchs, Burkhard +1 more
We present a new unbiased search for OB associations in the Solar neighbourhood which have hosted the progenitor stars of the core collapse supernovae responsible for the Local Bubble in the interstellar gas. For this purpose we have analyzed a volume complete set (with a diameter of 400 pc) of B stars drawn from the Hipparcos catalogue and the Ar…
What Physical Processes Drive the Interstellar Medium in the Local Bubble?
Dettbarn, C.; Breitschwerdt, D.; Fuchs, B. +1 more
Recent 3D high-resolution simulations of the interstellar medium in a star forming galaxy like the Milky Way show that supernova explosions are the main driver of the structure and evolution of the gas. Its physical state is largely controlled by turbulence due to the high Reynolds numbers of the average flows. For a constant supernova rate a dyna…
Kinetic-Hydrodynamic Models of the Solar Wind Interaction with the Partially Ionized Supersonic Flow of the Local Interstellar Gas: Predictions and Interpretations of the Experimental Data
Baranov, Vladimir B.
At present there is no doubt that the local interstellar medium (LISM) is mainly partially ionized hydrogen gas moving with a supersonic flow relative to the solar system. The bulk velocity of this flow is approximately equal ∼26 km/s. Although the interaction of the solar wind with the charged component (below plasma component) of the LISM can be…
Constraints on the Structure of the Heliospheric Interface Based on Ly α Absorption Spectra
Wood, Brian E.; Izmodenov, Vladislav V.; Malama, Yury G.
Spectroscopic observations of the hydrogen Ly α lines from nearby stars taken by the Hubble Space Telescope (HST) sometimes show absorption signatures from the heliosphere. This absorption is a unique diagnostic of material in the outermost parts of our heliosphere. We summarize how the HST data have been used to test various models of the heliosp…
Advances in Plasmaspheric Wave Research with CLUSTER and IMAGE Observations
Carpenter, Donald L.; Darrouzet, Fabien; Grimald, Sandrine +8 more
This paper highlights significant advances in plasmaspheric wave research with Cluster and Image observations. This leap forward was made possible thanks to the new observational capabilities of these space missions. On one hand, the multipoint view of the four Cluster satellites, a unique capability, has enabled the estimation of wave characteris…
Electric Fields and Magnetic Fields in the Plasmasphere: A Perspective From CLUSTER and IMAGE
de Keyser, Johan; Carpenter, Donald L.; Darrouzet, Fabien +7 more
The electric field and magnetic field are basic quantities in the plasmasphere measured since the 1960s. In this review, we first recall conventional wisdom and remaining problems from ground-based whistler measurements. Then we show scientific results from Cluster and Image, which are specifically made possible by newly introduced features on the…