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Using cm observations to constrain the abundance of very small dust grains in Galactic cold cores
Paladini, R.; Ysard, N.; Laureijs, R. J. +9 more
In this analysis, we illustrate how the relatively new emission mechanism, known as spinning dust, can be used to characterize dust grains in the interstellar medium. We demonstrate this by using spinning dust emission observations to constrain the abundance of very small dust grains (a ≲ 10 nm) in a sample of Galactic cold cores. Using the physic…
Spectral analysis of SMC X-2 during its 2015 outburst
Tiengo, A.; Mereghetti, S.; Sidoli, L. +3 more
We report on the results of XMM-Newton and Swift observations of SMC X-2 during its last outburst in 2015 October, the first one since 2000. The source reached a very high luminosity (L ∼ 1038 erg s-1), which allowed us to perform a detailed analysis of its timing and spectral properties. We obtained a pulse period Pspin…
An induced global magnetic field looping around the magnetotail of Venus
Barabash, Stas; Zhang, Tielong; Rong, Zhaojin +8 more
Venus serves as the prototype of solar wind interaction with unmagnetized planetary bodies with atmospheres. It has no intrinsic dipole or crustal magnetic field; the only magnetic field is believed to be formed by the draped interplanetary magnetic field (IMF). However, the large-scale magnetic field observed over the north polar region of Venus …
Empirically Estimated Far-UV Extinction Curves for Classical T Tauri Stars
France, Kevin; Brown, Alex; Herczeg, Gregory +3 more
Measurements of extinction curves toward young stars are essential for calculating the intrinsic stellar spectrophotometric radiation. This flux determines the chemical properties and evolution of the circumstellar region, including the environment in which planets form. We develop a new technique using H2 emission lines pumped by stell…
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…