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Of Martian expeditionary accomplishments, the Trans-Mars Expedition is the most audacious in terms of the logistical challenges imposed upon it and diversity of scientific foci it could encompass. The similar […]
Because of the ubiquity of subsurface microbial life on Earth, examination of the subsurface of Mars could provide an answer to the question of whether microorganisms exist or ever existed […]
Some molecules, particularly aromatics, have high molar extinction coefficients at wavelengths in the damaging ultraviolet radiation region of the spectrum between 200 and 400 nm. Thus, under a UV radiation […]
The notion that ultraviolet (UV) fluxes, and thus biologically weighted irradiances, were higher on Archaean Earth than on present-day Earth has been a pervasive influence on thinking concerning the nature […]
Some believe that the planet Mars holds promise as a new home for humankind and that it could become the focus of a large scale colonisation effort at some undefined […]
We used ultraviolet radiation dosimeters to investigate human exposure at two polar latitudes with a 24-h photoperiod: at Rothera Station (UK) (67degreesS) and at a field camp in the Haughton […]
During the past decade new questions in science have emerged that require broad inter-disciplinary approaches. ‘Do asteroids and comets cause extinctions?’ and ‘Was there, or is there, life on Mars?’ […]
[1] We analyze Trimpi signatures during 23 and 24 April 1994 at four sites on or near the Antarctic Peninsula (Palmer, Faraday, Rothera, and Halley) on subionospheric VLF signals received […]
The aa index provides the longest geomagnetic data set that can be used in the analysis of magnetospheric and ionospheric phenomena. All phases of the solar cycle show increases in […]
The 2002 Annual Symposium of the British Ecological Society on Macroecology: reconciling divergent perspectives on large-scale ecological patterns was held at the University of Birmingham, UK from 17 to 19 […]
The HF radar Doppler spectral width boundary (SWB) in the cusp represents a very good proxy for the equatorward edge of cusp ion precipitation in the dayside ionosphere. For intervals […]
[1] We present measurements of the convection electric field in the dayside ionosphere during extended intervals when the interplanetary magnetic field (IMF) has a negative Bz component and a significant […]