Search Publications
Use of non-radiation hardened micro-circuits in space — Experience from the cluster digital wave processor
Alleyne, H. St. C.; Yearby, K. H.
The trend for higher performance, lower cost, space instrumentation is leading towards the use commercial or industrial electronic parts, rather than specifically radiation hardened military grade parts. The micro-processor and memory devices used in the Cluster Digital Wave Processor (DWP) are not specifically radiation hardened parts, although t…
Hot loop oscillations seen by SUMER
Solanki, S. K.; Curdt, W.; Innes, D. E. +2 more
Chasing coronaij x-ray emission to the end of the pleiades main sequence … and beyond?
Briggs, K. R.; Pye, J. P.
We have used a 40-ks XMM-Newton observation to examine the X-ray emission of 33 proposed M-type members in. the core of the Pleiades. We reach a limiting X-ray luminosity of LX ≈ × 10 27 erg s -1 in the field centre and detect 17 of 19 members with MIc < 10.5 (where MIc
A transient event in lines of Ne V, VI and VII
Jordan, C.; Houdebine, E. R.
We report observations of a transition region brightening made with the Coronal Diagnostic Spectrometer onboard the Solar and Heliospheric Observatory. We observed a region of the quiet Sun in 12 spectral lines with temperatures of formation from =~ 3 x 104 K to 1.1 x 106 K. The transient event occured in a network boundary r…
Eta Carinae: Bullet Streams and Colliding Wind Shocks
Currie, D. G.
Eta Carinae, the most massive and most luminous star in our Galaxy, erupted in 1842 with an energy rivaling a supernova. It ejected approximately two solar masses of material to form an extended bipolar nebula (the homunculus), a variety of massive ``bullets'' (NN and NS knots and the South Bar) and the ``spikes'' (long narrow strings of bullets).…
Far-Ultraviolet light curves of the δ Scuti variable: β Cassiopeiae
Cugier, H.; Daszyńska, J.
Cluster magnetic field observations of magnetospheric boundaries
Balogh, A.; Horbury, T. S.; Lucek, E. A. +7 more
Early Cluster magnetic field observations of boundaries and boundary layers in the near-Earth environment are reviewed. By combining data from four spacecraft, typically separated by ∼600 km, the scale, orientation and motion of structures can be deduced. Early results from the magnetic field investigation are reviewed, such as estimates of the or…
Solar observations from space and from the ground
Curdt, W.
Recent results from space missions like YOHKOH, SOHO or TRACE as well as ground-based observations clearly indicate that physical processes of most solar phenomena take place on small scales, which are still below the resolution of the instruments employed. There is an urgent need for observations at higher resolution and also for their extension …
Intercalibration of SUMER and CDS on SOHO. III. SUMER and CDS-GIS
Solanki, Sami K.; Schühle, Udo; Pauluhn, Anuschka +2 more
Simultaneous observation of the same solar sources with different instruments is one way to test prelaunch radiometric calibrations and to detect changes in responsivity with time of extreme-ultraviolet instruments in space. Here we present the results of intercalibration of the SUMER (Solar Ultraviolet Measurements of Emitted Radiation) spectrome…
Excitation of Solar p-mode Oscillations by Flares
Basu, Sarbani; Antia, H. M.; Ambastha, Ashok
Solar flares release large amounts of energy at different layers of the solar atmosphere. It is, therefore, expected that major flares would be able to excite waves, thereby affecting the p-mode oscillation characteristics. From the analysis of MDI data, we find that power in p-modes appears to increase for some flares, beyond the normal values ex…