Search Publications

An Analysis of the Formation of Interconnecting Loops

Chen, Jie; Deng, Yuanyong; Zhang, Yin +2 more

Fifty interconnecting loops (ILs) that are induced by new-born active regions are investigated. The formation period of four ILs including two same-hemisphere interconnecting loops (HILs) and two transequatorial loops (TLs) are analyzed. The magnetic flux related with these loops is studied. Considering the active region pairs related with the IL …

Modeling spacecraft oscillations in HRSC images of Mars Express

Bostelmann, J.; Heipke, C.

Since January 2004 the High Resolution Stereo Camera (HRSC) is mapping planet Mars. The multi-line sensor on board the ESA Mission Mars Express images the Martian surface with a resolution of up to 12m per pixel in three dimensions and in color. As part of the Photogrammetric/Cartographic Working Group of the HRSC Science Team the Institute of Pho…

Using complex independent component analysis to extract weak returns in MARSIS radar data and their possible relation to a subsurface reflector on Mars

Nielsen, Erling; Zhang, Zhenfei

Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) radar signals returned from the surface and subsurface of the northern lowlands of Mars are mostly characterized as a prominent surface pulse followed by a tail of weak signals. We applied the method of blind source separation (BSS) using complex independent component analysis (CI…

RX and Z Mode Growth Rates and Propagation at Cavity Boundaries

Gurnett, D. A.; Pickett, J. S.; Lucek, E. +5 more

Recent Cluster WBD observations in the Earth's auroral acceleration region have detected trapped Z mode auroral kilometric radiation while the spacecraft were entering a deep density cavity. The Z mode has a clear cutoff at the local upper hybrid resonance frequency, while RX mode radiation is detected above the RX mode cutoff frequency. The small…

Oxford SWIFT integral field spectrograph and multiwavelength observations of the Eagle galaxy at z= 0.77

Weiner, Benjamin J.; Koekemoer, A. M.; Salim, Samir +17 more

The ‘Eagle' galaxy at a redshift of 0.77 is studied with the Oxford Short Wavelength Integral Field Spectrograph (SWIFT) and multiwavelength data from the All-wavelength Extended Groth strip International Survey (AEGIS). It was chosen from AEGIS because of the bright and extended emission in its slit spectrum. 3D kinematic maps of the Eagle reveal…

Hall MHD simulations of collisionless multiple X line reconnection

Liu, C. X.; Jin, S. P.; Wei, F. S.

A Hall MHD simulation of multiple X line reconnection, in which a diffusion region around the standing X line and the moving plasmoids are involved, is presented. The observed features of Hall magnetic and electric fields in the diffusion region and the direction reversal of the electron flow in the vicinity of the magnetic separatrices are displa…

10 Years of the optical & UV monitor (OM) on-board XMM-Newton

Talavera, Antonio; OMCal Team

The XMM-Newton X-ray observatory was launched at the end of 1999 and it is still successfully operated. In addition to the X-ray instruments, the payload carries a small telescope, the Optical Monitor, which provides simultaneous imaging and spectroscopic observations in the optical and UV ranges. In this report we review the status of the OM and …

A search for coherent structures in subsurface flows

Howe, R.; Komm, R.; Hill, F.

We search for coherent patterns in horizontal subsurface flows obtained from Global Oscillation Network Group (GONG) Dopplergram data using ring-diagram analysis. The existence of north-south aligned downflow patterns near the equator has been predicted by numerical models of the solar convection zone. We analyze time series of daily flow measurem…

Publisher's Note: Super-Alfvénic Propagation of Substorm Reconnection Signatures and Poynting Flux [Phys. Rev. Lett. 107, 065001 (2011)]

Eastwood, J. P.; Phan, T. D.; Drake, J. F. +1 more

Corrected mu_delta for Stars of Hipparcos Catalogue from Independent Latitude Observations over Many Decades

Damljanovic, G.; Milic, I. S.

During the last century, there were many so-called independent latitude (IL) stations with the observations which were included into data of a few international organizations (like Bureau International de l'Heure - BIH, International Polar Motion Service - IPMS) and the Earth rotation programmes for determining the Earth Orientation Parameters - E…