Search Publications
Missions
Journals
Publication Years
Deriving plasma densities in tenuous plasma regions, with the spacecraft potential under active control
Andriopoulou, M.; Nakamura, R.; Baumjohann, W. +2 more
Variations of the floating potential on spacecraft are often used to derive plasma densities, complementing the plasma instrument measurements. All spacecraft of the Cluster mission are equipped with Active Spacecraft POtential Control (ASPOC) instruments that control the spacecraft potential. Although the ASPOC operation increases the accuracy of…
Asymmetric ionospheric outflow observed at the dayside magnetopause
Glassmeier, K. -H.; Zhang, H.; Zong, Q. -G. +4 more
An important source of the terrestrial magnetospheric plasma is the Earth's ionospheric outflows from the high-latitude regions of both hemispheres. The ionospheric ion outflows have rarely been observed at the dayside magnetopause. We report Cluster observations of the ionospheric ion outflows observed at the dayside magnetopause. The low-energy …
Groundwater seepage landscapes from distant and local sources in experiments and on Mars
Hauber, E.; Kleinhans, M. G.; Marra, W. A. +3 more
Valleys with theater-shaped heads can form due to the seepage of groundwater and as a result of knickpoint (waterfall) erosion generated by overland flow. This ambiguity in the mechanism of formation hampers the interpretation of such valleys on Mars, particularly since there is limited knowledge of material properties. Moreover, the hydrological …
Combining physical galaxy models with radio observations to constrain the SFRs of high-z dusty star-forming galaxies
Franceschini, A.; Efstathiou, A.; Silva, L. +2 more
We complement our previous analysis of a sample of z ∼ 1-2 luminous and ultraluminous infrared galaxies [(U)LIRGs], by adding deep Very Large Array radio observations at 1.4 GHz to a large data set from the far-UV to the submillimetre, including Spitzer and Herschel data. Given the relatively small number of (U)LIRGs in our sample with high signal…
Statistics and accuracy of magnetic null identification in multispacecraft data
André, M.; Vaivads, A.; Khotyaintsev, Yu. V. +2 more
Complex magnetic topologies are ubiquitous in astrophysical plasmas. Analyzing magnetic nulls, regions of vanishing magnetic field, is one way to characterize 3-D magnetic topologies. Magnetic nulls are believed to be important in 3-D reconnection and turbulence. In the vicinity of a null, plasma particles become unmagnetized and can be accelerate…
Sub-arcsec mid-IR observations of NGC 1614: Nuclear star formation or an intrinsically X-ray weak AGN?
Colina, L.; García-Burillo, S.; Herrero-Illana, R. +10 more
We present new mid-infrared (mid-IR) N-band spectroscopy and Q-band photometry of the local luminous IR galaxy NGC 1614, one of the most extreme nearby starbursts. We analyse the mid-IR properties of the nucleus (central 150 pc) and four regions of the bright circumnuclear (diameter∼600 pc) star-forming (SF) ring of this object. The nucleus differ…
Magnetospheric Accretion in Close Pre-main-sequence Binaries
Herczeg, Gregory J.; Ardila, David R.; Mathieu, Robert D. +2 more
The transfer of matter between a circumbinary disk and a young binary system remains poorly understood, obscuring the interpretation of accretion indicators. To explore the behavior of these indicators in multiple systems, we have performed the first systematic time-domain study of young binaries in the ultraviolet. We obtained far- and near-ultra…
Venus' clouds as inferred from the phase curves acquired by IR1 and IR2 on board Akatsuki
Imamura, Takeshi; Ueno, Munetaka; Kasaba, Yasumasa +12 more
We present phase curves for Venus in the 1-2 µm wavelength region, acquired with IR1 and IR2 on board Akatsuki (February-March 2011). A substantial discrepancy with the previously-published curves was found in the small phase angle range (0-30°). Through analysis by radiative-transfer computation, it was found that the visibility of larger (…
Herschel imaging of the dust in the Helix nebula (NGC 7293)
Ivison, R. J.; Olofsson, G.; Gomez, H. L. +19 more
Aims: In our series of papers presenting the Herschel imaging of evolved planetary nebulae, we present images of the dust distribution in the Helix nebula (NGC 7293).
Methods: Images at 70, 160, 250, 350, and 500 µm were obtained with the PACS and SPIRE instruments on board the Herschel satellite.
Results: The broadband maps s…
Origin and Kinematics of the Eruptive Flow from XZ Tau Revealed by ALMA
Palau, Aina; Galván-Madrid, Roberto; Zapata, Luis A. +6 more
We present high angular resolution (∼0.″94) 12CO(1-0) Atacama Large Millimeter/submillimeter Array (ALMA) observations obtained during the 2014 long baseline campaign from the eruptive bipolar flow from the multiple XZ Tau stellar system discovered by the Hubble Space Telescope (HST). These observations reveal, for the first time, the k…