Search Publications
Quadrupolar Dimmings During a Partial Halo Coronal Mass Ejection Event
Yang, L.; Hong, J.; Yang, J. +3 more
We present detailed observations of the formations of four distinct coronal dimmings during a flare of 17 September 2002, which was followed by an eruption of a huge coronal loop system, and then an over-and-out partial halo coronal mass ejection (CME), with the same direction as the loop system eruption but laterally far offset from the flare sit…
Ultraviolet spectroscopy of Asteroid (4) Vesta
A'Hearn, Michael F.; Feaga, Lori M.; Russell, Christopher T. +6 more
We report a comprehensive review of the UV-visible spectrum and rotational lightcurve of Vesta combining new observations by Hubble Space Telescope and Swift Gamma-ray Burst Observatory with archival International Ultraviolet Explorer observations. The geometric albedos of Vesta from 220 nm to 953 nm are derived by carefully comparing these observ…
A comparative study of interior layered deposits on Mars
Jaumann, R.; Neukum, G.; Sowe, M.
On the effect of line current width and relative position on the multi-spacecraft curlometer technique
Fazakerley, A. N.; Lester, M.; Owen, C. J. +2 more
The response of the multi-spacecraft curlometer technique to variations in the size and relative position of infinitely long line currents with radially varying current density is systematically investigated for spacecraft in a regular tetrahedral formation. It is shown that, for line currents with a width less than the spacecraft separation, ther…
Running Umbral Waves Observed with Hinode
Liang, Hongfei; Li, Haidong; Zhao, Li +2 more
Observations of the main sunspot of NOAA 10953 were carried out with the Solar Optical Telescope aboard Hinode with the line Ca II H on 2007 April 30. The high-cadence (up to 10 s) Ca II H intensity images permit us to elaborate on the nature of umbral oscillations. It is found there are 19 wave sources within the sunspot and 82 running umbral wav…
The Simultaneous Medicina-Planck Experiment: data acquisition, reduction and first results
Bonavera, L.; Burigana, C.; Cuttaia, F. +13 more
The Simultaneous Medicina-Planck Experiment (SiMPlE) is aimed at observing a selected sample of 263 extragalactic and Galactic sources with the Medicina 32-m single-dish radio telescope in the same epoch as the Planck satellite observations.
The data, acquired with a frequency coverage down to 5 GHz and combined with Planck at frequencies abo…Hinode SOT/SP and SoHO/MDI quiet Sun magnetic field. Implications of their differences on the extrapolated chromospheric field and the height of the magnetic canopy
Tziotziou, K.; Tsiropoula, G.; Kontogiannis, I.
Aims: We explore the differences in the measurement of the magnetic field of the quiet solar photosphere provided by the Michelson Doppler Imager (MDI) onboard SoHO and the SpectroPolarimeter (SOT/SP) onboard Hinode and the ensuing implications for the extrapolated chromospheric magnetic field and the determination of the location of the magn…
Mesoscale PIC simulation of double layers and electron holes affecting parallel and transverse accelerations of electrons and ions
Singh, Nagendra; Araveti, Sudeepth; Wells, Earl B.
We study the dynamical behavior of potential structures in the auroral upward current region. The study is based on a large two-dimensional particle-in-cell simulation. A double layer (DL) forms in the auroral potential structure in the counterstreaming expansion of cold and hot plasmas from bottom (ionospheric side) and top (magnetospheric side),…
Rapid Enhancement of Sheared Evershed Flow Along the Neutral Line Associated with an X6.5 Flare Observed by Hinode
Liu, Chang; Wang, Haimin; Deng, Na +1 more
We present G-band and Ca II H observations of NOAA AR 10930 obtained by Hinode/SOT on 2006 December 6 covering an X6.5 flare. The Local Correlation Tracking technique was applied to the foreshortening-corrected G-band image series to acquire horizontal proper motions in this complex βγδ active region. With the continuous high-quality, spatial and …
Anomalous foreshock field-aligned beams observed by Cluster
Mazelle, C.; Wilber, M.; Meziane, K. +2 more
We report occasional observations of two simultaneously distinct ion foreshock components recorded by the Cluster spacecraft upstream of the Earth's bow shock. In most occurrences, the lower-energy population originates as a field-aligned beam (FAB) associated with quasi-perpendicular regions, which loses energy as the IMF rotates into oblique geo…