Search Publications
Magnetospheric ULF wave studies in the frame of Swarm mission: a time-frequency analysis tool for automated detection of pulsations in magnetic and electric field observations
Daglis, Ioannis A.; Balasis, Georgios; Papadimitriou, Constantinos +2 more
We combine the advantages of multi-spacecraft and ground-based monitoring of the geospace environment in order to analyze and study magnetospheric ultra low frequency (ULF) waves. In line with this aim, we also develop and deliver relevant analysis tools based on wavelet transforms and tailored to the Swarm mission. In the preparation phase as wel…
On the shape of the mass-function of dense clumps in the Hi-GAL fields . I. Spectral energy distribution determination and global properties of the mass-functions
Smith, M. D.; Montier, L.; Ristorcelli, I. +11 more
Context. Stars form in dense, dusty clumps of molecular clouds, but little is known about their origin and evolution. In particular, the relationship between the mass distribution of these clumps (also known as the clump mass function or CMF) and the stellar initial mass function (IMF), is still poorly understood.
Aims: To discern the "true" …
The northwestern ejecta knot in SN 1006
Miceli, M.; Bocchino, F.; Decourchelle, A. +3 more
Aims: We want to probe the physics of fast collision-less shocks in supernova remnants. We are interested in the non-equilibration of temperatures and particle acceleration. Specifically, we aim to measure the oxygen temperature with regards to the electron temperature. In addition, we search for synchrotron emission in the northwestern therm…
Energy transfer across the magnetopause for northward and southward interplanetary magnetic fields
Jiang, Y.; Kabin, K.; Lu, J. Y. +2 more
A three-dimensional adaptive magnetohydrodynamic (MHD) model is used to examine the energy flow from the solar wind to the magnetosphere. Using the model, we directly compute fluxes of mechanical and electromagnetic energy across the magnetopause surface. For northward IMF, most of the energy flux inflow occurs near the polar cusps on magnetopause…
The Star Cluster System in the Nearby Starburst Galaxy M82
Hwang, Narae; Lee, Myung Gyoon; Lim, Sungsoon
We present a photometric study of star clusters in the nearby starburst galaxy M82 based on the UBVI-, YJ- and H-band Hubble Space Telescope images. We find 1105 star clusters with V < 23 mag. Of those, 1070 are located in the disk region, while 35 star clusters are in the halo region. The star clusters in the disk are composed of a dominant bl…
Extreme-ultraviolet and X-Ray Observations of Comet Lovejoy (C/2011 W3) in the Lower Corona
Raymond, John C.; Saar, Steven H.; Ko, Yuan-Kuen +2 more
We present an analysis of extreme-ultraviolet and soft X-ray emission detected toward Comet Lovejoy (C/2011 W3) during its post-perihelion traverse of the solar corona on 2011 December 16. Observations were recorded by the Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory and the X-Ray Telescope (XRT) aboard Hinode. A single…
Emission Height and Temperature Distribution of White-light Emission Observed by Hinode/SOT from the 2012 January 27 X-class Solar Flare
Masuda, Satoshi; Ohno, Masanori; Shimizu, Toshifumi +2 more
White-light emissions were observed from an X1.7 class solar flare on 2012 January 27, using three continuum bands (red, green, and blue) of the Solar Optical Telescope on board the Hinode satellite. This event occurred near the solar limb, and so differences in the locations of the various emissions are consistent with differences in heights abov…
Dispersion relation analysis of turbulent magnetic field fluctuations in fast solar wind
Glassmeier, K. -H.; Narita, Y.; Perschke, C. +2 more
Physical processes of the energy transport in solar wind turbulence are a subject of intense studies, and different ideas exist to explain them. This manuscript describes the investigation of dispersion properties in short-wavelength magnetic turbulence during a rare high-speed solar wind event with a flow velocity of about 700 km s-1 u…
Solar Intranetwork Magnetic Elements: Flux Distributions
Wang, Jingxiu; Jin, Chunlan; Zhou, Guiping
The current study aims at quantifying the flux distributions of solar intranetwork (IN) magnetic field based on the data taken in four quiet and two enhanced network areas with the Narrow-band Filter Imager of the Solar Optical Telescope on board the Hinode satellite. More than 14000 IN elements and 3000 NT elements were visually identified. They …
Lyα luminosity functions at redshift z ≈ 4.5
Finkelstein, Steven L.; Tilvi, Vithal; Zheng, Zhen-Ya +7 more
We present a spectroscopically confirmed sample of Lyman α emitting galaxies (LAEs) at z ∼ 4.5 in the Extended Chandra Deep Field-South (ECDFS), which we combine with a sample of z ∼ 4.5 LAEs from previous narrow-band surveys from the Large Area Lyman Alpha (LALA) survey to build a unified Lyα luminosity function. We spectroscopically observed 64 …