Search Publications
An Earth-like correspondence between Saturn's auroral features and radio emission
Gurnett, D. A.; Dougherty, M. K.; Kurth, W. S. +12 more
Saturn is a source of intense kilometre-wavelength radio emissions that are believed to be associated with its polar aurorae, and which provide an important remote diagnostic of its magnetospheric activity. Previous observations implied that the radio emission originated in the polar regions, and indicated a strong correlation with solar wind dyna…
Moving Magnetic Features around Sunspots
Shine, Richard A.; Hagenaar, Hermance J.
We study statistical properties of small-scale magnetic features around sunspots using time sequences of high-resolution magnetograms of eight sunspots made with the Michelson Doppler Imager (MDI) on board SOHO. Flow maps around the spots are also derived from cross-correlation analysis of MDI continuum or TRACE white light and used for comparison…
Magnetic Reconnection Flux and Coronal Mass Ejection Velocity
Qiu, Jiong; Yurchyshyn, Vasyl B.
We explore the relationship between the total reconnection flux ψrec estimated from flare observations and the velocity VCME of coronal mass ejections (CMEs) observed with the Large Angle and Spectrometric Coronagraph (LASCO) Experiment. Our study includes 13 events with varying magnetic configurations in source regions. It i…
Stellar Disk Truncations at High z: Probing Inside-Out Galaxy Formation
Trujillo, Ignacio; Pohlen, Michael
We have conducted a systematic search for stellar disk truncations in disklike galaxies at intermediate redshift (z<1.1) using the Hubble Ultra Deep Field data. We use the position of the truncation as a direct estimator of the size of the stellar disk. After accounting for the surface brightness evolution of the galaxies, our results suggest t…
A submillimetre survey of Lyman α haloes in the SA22 protocluster at z= 3.1
Ivison, R. J.; Taniguchi, Y.; Smail, Ian +7 more
We present the results from a submillimetre (submm) survey of a sample of 23 giant Lyman α (Lyα) emitting nebulae in the overdensity at z= 3.09 in the SA22 field. These objects, which have become known as Lyα Blobs (LABs), have a diverse range of morphology and surface brightness, but the nature of their power source remains unclear, with both coo…
Hubble Space Telescope Imaging of the Primary Shock Front in the Cygnus Loop Supernova Remnant
Blair, William P.; Raymond, John C.; Sankrit, Ravi
We present Hubble Space Telescope WFPC2 narrowband Hα (F656N) and [O III] λ5007 (F502N) imaging of two fields on the northeastern limb of the Cygnus Loop supernova remnant. This region provides an outstanding example of the initial encounter between the primary blast wave and the surrounding interstellar medium. The Hα images show the primary nonr…
The Double Star mission
Escoubet, C. P.; Liu, Z. X.; Shen, C. +4 more
The Double Star Programme (DSP) was first proposed by China in March, 1997 at the Fragrant Hill Workshop on Space Science, Beijing, organized by the Chinese Academy of Science. It is the first mission in collaboration between China and ESA. The mission is made of two spacecraft to investigate the magnetospheric global processes and their response …
Evidence of Primordial Clustering around the QSO SDSS J1030+0524 at z=6.28
Panagia, N.; Djorgovski, S. G.; Stern, D. +7 more
We present tentative evidence of primordial clustering, manifested as an excess of color-selected objects in the field of the QSO SDSS J1030+0524 at redshift z=6.28. We have selected objects red in i775-z850 on the basis of Hubble Space Telescope Advanced Camera for Surveys imaging of a field centered on the QSO. Compared to …
Jet rotation: Launching region, angular momentum balance and magnetic properties in the bipolar outflow from RW Aur
Ray, T. P.; Eislöffel, J.; Marconi, A. +3 more
Using STIS on board the HST we have obtained a spectroscopic map of the bipolar jet from
Central position of the source region of storm-time chorus
Gurnett, D. A.; Pickett, J. S.; Santolík, O. +2 more
We describe an analysis method to estimate the central position of the source region of electromagnetic waves. The method is based on simultaneous measurements of the Poynting flux in several points in space. We analyze measurements of whistler-mode chorus by the four spacecraft of the Cluster mission close to their perigee at a radial distance of…