Search Publications
New upper limits for hydrogen halides on Saturn derived from Cassini-CIRS data
Fletcher, L. N.; Irwin, P. G. J.; Teanby, N. A. +2 more
Far infrared spectra (10-600 cm -1) from Cassini's Composite InfraRed Spectrometer (CIRS) were used to determine improved upper limits of hydrogen halides HF, HCl, HBr, and HI in Saturn's atmosphere. Three observations, comprising a total of 3088 spectra, gave 3 σ upper limits on HF, HCl, HBr, and HI volume mole fractions of 8.0×10, 6.7…
Mars 1064 nm spectral radiance measurements determined from the receiver noise response of the Mars Orbiter Laser Altimeter
Zuber, Maria T.; Sun, Xiaoli; Neumann, Gregory A. +1 more
A technique was developed to compute the radiance of the scene viewed by the optical receiver of the Mars Orbiter Laser Altimeter. The technique used the detection threshold and the false detection rate of the receiver to provide a passive radiometry measurement of Mars at the 1064 nm wavelength over a 2 nm bandwidth and subkilometer spatial resol…
EIT and TRACE responses to flare plasma
Mason, H. E.; Del Zanna, G.; Tripathi, D. +1 more
Aims.To understand the contribution of active region and flare plasmas to the λ195 channels of SOHO/EIT (Extreme-ultraviolet Imaging Telescope) and TRACE (Transition Region and Coronal Explorer).
Methods: .We have analysed an M8 flare simultaneously observed by the Coronal Diagnostic Spectrometer (CDS), EIT, TRACE and RHESSI. We obtained synth…
Properties of dust and detection of Hα emission in LDN 1780
del Burgo, C.; Cambrésy, L.
We present ISOPHOT observations between 60 and 200µm and a near-infrared extinction map of the small intermediate-density cloud Lynds Dark Nebula (LDN) 1780 (Galactic coordinates l = 359° and b = 36.8°). For an angular resolution of 4arcmin, the visual extinction maximum is AV = 4.4mag. We have used the ISOPHOT data together with …
Small-scale solitary wave pulses observed by the Ulysses magnetic field experiment
Balogh, A.; Horbury, T. S.; Rees, A.
We present here a new class of isolated structure observed in interplanetary space. Events in this class consist of short-duration increases in the magnetic field magnitude and an associated rotation in the magnetic field direction, with a duration of the order of 30 s. After surveying the entire 14-year high-resolution (1 vector sample per 1 or 2…
The sun, space weather and GIC effects in Sweden
Lundstedt, H.
The solar activity drives the space weather on short-terms and the space climate on long-terms. Being close to the auroral oval has made Swedish electrical systems particularly vulnerable to space weather. Requirements for long-term planning of energy production has now also created an interest in space climate. A short description of the Swedish …
Astrochemistry: Complex organic matter in Titan's aerosols? (Reply)
Steller, M.; Atreya, S. K.; Owen, T. +19 more
Biemann et al. calls into question our preliminary interpretations of our experimental results. A comparison of laboratory and flight measurements should settle the uncertainties he raises. In addition to evaluating instrumental characteristics such as the 'piston effect', a technique we used for injecting oven-gas content for gas chromatography-m…
First broad band study of the mysterious source 1E 1743.1-2843
Sidoli, L.; Ubertini, P.; Bazzano, A. +4 more
Context: .In the last years, the persistent source 1E 1743.1-2843 has been observed in the X-rays, but never above 20 keV. In previous works, it was stressed that a possible high energy emission could give further indications on the accreting object nature which remains still unknown.
Aims: .We present here more than two years of 1E 1743.1-284…
Substorms and Their Solar Wind Causes
Nakamura, Rumi
Consequences of the solar wind input observed as large scale magnetotail dynamics during substorms are reviewed, highlighting results from statistical studies as well as global magnetosphere/ionosphere observations. Among the different solar wind input parameters, the most essential one to initiate reconnection relatively close to the Earth is a s…
Neoclassical bootstrap current in solar plasma loops
Huang, G. -L.; Tan, B. -L.
From the similarities in magnetic configurations and plasma behaviors between tokamaks and solar current-carrying plasma loops, we apply the theory of neoclassical bootstrap current in tokamaks to the solar plasma loops. We present a simplified expression of the bootstrap current in the solar plasma loops and find that there may be a considerable …