Search Publications
Properties of structured coronal mass ejections in solar cycle 23
Bothmer, V.; Tripathi, D.; Cremades, H.
The Solar and Heliospheric Observatory has provided to date doubtlessly the best dataset of coronal observations ever taken over the course of a solar cycle. Structured coronal mass ejections, i.e. events with clear white-light fine structures, have been selected from the dataset of the large angle spectroscopic coronagraph during the period 1996 …
SMART-1 mission to the Moon: Status, first results and goals
Schmidt, W.; Grande, M.; Keller, H. U. +19 more
We present the first results from SMART-1's science and technology payload. SMART-1 is Europe's first lunar mission and will provide some significant advances to many issues currently active in lunar science, such as our understanding of lunar origin and evolution. The mission also contributes a step in developing an international program of lunar…
New developments in SOLAR2000 for space research and operations
Tobiska, W. Kent; Bouwer, S. Dave
The SOLAR2000 (S2K) project provides solar spectral irradiances and integrated solar irradiance proxies for space researchers as well as ground- and space-based operational users. The S2K model currently represents empirical solar irradiances and integrated irradiance proxies covering the spectral range from the X-rays through the far infrared and…
Forces governing coronal mass ejections
Vršnak, B.
Kinematics of CMEs is analyzed to get an insight into the properties of forces partaking in the eruption. It is demonstrated that the Lorentz force plays a dominant role within a distance of a few solar radii. In the distance range 1 30 solar radii, the inferred values of the Lorentz-force acceleration aL on average decrease with the he…
Equatorial noise: Statistical study of its localization and the derived number density
Maksimovic, M.; de Conchy, Y.; Santolík, O. +5 more
Results of a statistical study of equatorial noise emissions are presented. These electromagnetic emissions are observed in the inner magnetosphere in the vicinity of the geomagnetic equator at frequencies below the lower hybrid frequency. We use the data recorded by four Cluster spacecraft during years 2001-2003. The data set was processed in thr…
Detecting X-ray QPOs in active galaxies
Vaughan, Simon; Uttley, Philip
Since EXOSAT produced the first good quality X-ray light curves of Seyfert galaxies there have been several claims of quasi-periodic oscillations (QPOs). None of these have withstood repeated analyses and observations. We review some problems concerning the detection of QPOs.
Observation of energy-dependent ionic charge states in impulsive solar energetic particle events
Klecker, B.; Kistler, L. M.; Kucharek, H. +3 more
We measured the mean ionic charge state of Fe in several 3He-rich and heavy-ion rich energetic particle events during the time period 1998 2000. We combined the ionic charge measurements of CELIAS/STOF onboard SOHO (10 100 keV/nuc) with the measurements of SEPICA onboard ACE (180 550 keV/nuc) to investigate the ionic charge distribution…
Science objectives and first results from the SMART-1/AMIE multicolour micro-camera
Langevin, Y.; Koschny, D.; Barucci, M. A. +16 more
The Advanced Moon micro-Imager Experiment (AMIE), on-board SMART-1, the first European mission to the Moon, is an imaging system with scientific, technical and public outreach objectives. The science objectives are to image the lunar South Pole, permanent shadow areas (ice deposit), eternal light (crater rims), ancient lunar non-mare volcanism, lo…
Observations of electrostatic solitary waves associated with reconnection by Geotail and Cluster
Gurnett, D. A.; Pickett, J. S.; Fazakerley, A. N. +8 more
We report the observations of Electrostatic Solitary Waves (ESWs) associated with reconnection by the Wideband Plasma Wave Receiver of Cluster and the Wave From Captures of Geotail near the diffusion region at dayside magnetopause and in the magnetotail region. ESWs have been observed along the plasma sheet boundary and near diffusion region, both…
Statistical analysis of the sunspot area and magnetic flux variations in 1996 2005 extracted from the Solar Feature Catalogue
Zharkova, V. V.; Zharkov, S. I.
This research presents some statistical properties of sunspots and their magnetic fields extracted in from May 1996 to May 2005 from the SOHO/MDI full disk whitelight images and magnetograms for the searchable Solar Feature Catalogue (SFC) using the automated pattern recognition techniques. A comparison of the total sunspot areas on a given day fr…