Search Publications
A statistical study of magnetospheric ion composition along the geomagnetic field using the Cluster spacecraft for L values between 5.9 and 9.5
Dandouras, I.; Sandhu, J. K.; Yeoman, T. K. +1 more
Using ion density data obtained by the CODIF (ion Composition and Distribution Function analyser) instrument on board the Cluster spacecraft, for the interval spanning 2001-2005, an empirical model describing the average ion mass distribution along closed geomagnetic field lines is determined. The empirical model describes the region spanning 5.9≤…
The Effect of Limited Sample Sizes on the Accuracy of the Estimated Scaling Parameter for Power-Law-Distributed Solar Data
Poedts, Stefaan; Berghmans, David; Seaton, Daniel B. +1 more
Many natural processes exhibit a power-law behavior. The power-law exponent is linked to the underlying physical process, and therefore its precise value is of interest. With respect to the energy content of nanoflares, for example, a power-law exponent steeper than 2 is believed to be a necessary condition for solving the enigmatic coronal heatin…
Saturn kilometric radiation intensities during the Saturn auroral campaign of 2013
Gurnett, D. A.; Dougherty, M. K.; Hospodarsky, G. B. +9 more
The Saturn auroral campaign carried out in the spring of 2013 used multiple Earth-based observations, remote-sensing observations from Cassini, and in situ-observations from Cassini to further our understanding of auroras at Saturn. Most of the remote sensing and Earth-based measurements are, by nature, not continuous. And, even the in situ measur…
Simultaneous radio and X-ray observations of PSR B0611+22
Rajwade, K.; Seymour, A.; Lorimer, D. R. +4 more
We report results from simultaneous radio and X-ray observations of PSR B0611+22 which is known to exhibit bursting in its single-pulse emission. The pulse phase of the bursts vary with radio frequency. The bursts are correlated in 327/150 MHz data sets while they are anti-correlated, with bursts at one frequency associated with normal emission at…
Modulation of the substorm current wedge by bursty bulk flows: 8 September 2002—Revisited
Nakamura, R.; Sergeev, V. A.; Milan, S. E. +12 more
The ultimate formation mechanism of the substorm current wedge (SCW) remains to date unclear. In this study, we investigate its relationship to plasma flows at substorm onset and throughout the following expansion phase. We revisit the case of 8 September 2002, which has been defined as "one of the best textbook examples of a substorm" because of …
Star-forming Activity in the H II Regions Associated with the IRAS 17160-3707 Complex
Ojha, D. K.; Vig, S.; Ghosh, S. K. +3 more
We present a multiwavelength investigation of star formation activity toward the southern H II regions associated with IRAS 17160-3707, located at a distance of 6.2 kpc with a bolometric luminosity of 8.3 × 105 L ⊙. The ionized gas distribution and dust clumps in the parental molecular cloud are examined in detail using measu…
Evidence that widespread star formation may be underway in G0.253+0.016, `The Brick'
Marsh, K. A.; Whitworth, A. P.; Clark, P. C. +1 more
Image cubes of differential column density as a function of dust temperature are constructed for Galactic Centre molecular cloud G0.253+0.016 (`The Brick') using the recently described PPMAP procedure. The input data consist of continuum images from the HerschelSpace Telescope in the wavelength range 70-500 µm, supplemented by previously pub…
Probing star formation in the dense environments of z ∼ 1 lensing haloes aligned with dusty star-forming galaxies detected with the South Pole Telescope
Omont, A.; Dole, H.; Doré, O. +46 more
We probe star formation in the environments of massive (∼1013 M⊙) dark matter haloes at redshifts of z ∼ 1. This star formation is linked to a submillimetre clustering signal which we detect in maps of the Planck High Frequency Instrument that are stacked at the positions of a sample of high redshift (z > 2) strongly lense…
Interplanetary Type IV Bursts
Hillaris, A.; Bouratzis, C.; Nindos, A.
We study the characteristics of moving type IV radio bursts that extend to hectometric wavelengths (interplanetary type IV or type IVIP bursts) and their relationship with energetic phenomena on the Sun. Our dataset comprises 48 interplanetary type IV bursts observed with the Radio and Plasma Wave Investigation (WAVES) instrument onboard Wind in t…
Separation of dynamic and isostatic components of the Venusian gravity and topography and determination of the crustal thickness of Venus
Yang, An; Huang, Jinshui; Wei, Daiyun
Assuming that the long-wavelength geoid and topography of Venus are supported by both mantle convection and Airy isostasy, we propose a method to separate the dynamic and isostatic components of the Venusian gravity and topography with the aid of the dynamic admittance from numerical models of mantle convection and the isostatic admittance from an…