Search Publications
Location and parameters of a microwave millisecond spike event
Nakajima, Hiroshi; Huang, Guangli
A typical microwave millisecond spike event on November 2, 1997 was observed by the radio spectrograph of National Astronomical Observatories (NAOs) at 2.6–3.8 GHz with high time and frequency resolution. This event was also recorded by Nobeyama Radio Polarimeters (NoRP) at 1–35 GHz and Radio Heliograph (NoRH) at 17 GHz. The source at 17 GHz is lo…
Time variations of cosmic ray electrons and nuclei between 1978 and 2004: Evidence for charge-dependent modulation organized by changes in solar magnetic polarity and current sheet tilt
Heber, B.; Webber, W. R.; Lockwood, J. A.
We have examined the 52-day average intensities of 1.2-GV electrons and positively charged nuclei of the same rigidity during the time period from 1978 to 2004. This time period covers a complete 22-year solar cycle plus data from 2000 to 2004 that can be used to examine the repetitive nature of the variations. The 11-year solar modulation changes…
Large-scale photospheric dynamics below coronal holes
Meunier, N.
A large data set of MDI magnetograms is studied to analyze the global dynamics of magnetic structures from network to active regions inside and outside coronal holes. We find a weaker meridional circulation at almost all latitudes, as well as a more differential rotation of the photospheric magnetic structures below high-latitude coronal holes. St…
GRB 050223: a faint gamma-ray burst discovered by Swift
Campana, S.; Tagliaferri, G.; Cusumano, G. +16 more
GRB 050223 was discovered by the Swift Gamma-Ray Burst Explorer on 2005 February 23 and was the first gamma-ray burst (GRB) to be observed by both Swift and XMM-Newton. At the time of writing (2005 May), it has one of the faintest GRB afterglows ever observed. The spacecraft could not slew immediately to the burst, so the first X-ray and optical o…
An unusually fast interplanetary coronal mass ejection observed by Ulysses at 5 AU on 15 November 2003
St. Cyr, O. C.; McComas, D. J.; Balogh, André +7 more
On 15 November 2003, at ∼2030 UT, Ulysses/SWOOPS observed the onset of a large, unusually fast interplanetary coronal mass ejection (ICME) in the solar wind at 5.2 AU. Ulysses measured the peak solar wind flow speed associated with this event, vmax = 993 km s-1, in the turbulent sheath region preceding the ICME. This is the f…
An X-Ray Transient and Optical Counterpart in the M31 Bulge
Williams, Benjamin F.; McClintock, Jeffrey E.; Kong, Albert K. H. +3 more
We have obtained snapshot images of a transient X-ray source in M31 from Chandra ACIS-I and the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS). The Chandra position of the X-ray nova was R.A.=00h42m56.038s+/-0.08", decl.=+41deg12'18.50"+/-0.07". The transient was active for at least 6 mon…
Evaluation of the sensitivity to mechanical vibrations of an IR Fourier spectrometer
Saggin, B.; Comolli, L.
This article presents an experimental and theoretical investigation of the sensitivity to mechanical disturbances of a Fourier-transform infrared spectrometer, the Planetary Fourier Spectrometer, currently orbiting around Mars onboard ESA Mars Express orbiter. A theoretical analysis has been performed in order to highlight the expected effects of …
Saturn's Variable Magnetosphere
Hansen, Kenneth C.; Gombosi, Tamas I.
Since the Cassini spacecraft reached Saturn's orbit in 2004, its instruments have been sending back a wealth of data on the planet's magnetosphere (the region dominated by the magnetic field of the planet). In this Viewpoint, we discuss some of these results, which are reported in a collection of reports in this issue. The magnetosphere is shown t…
Structure of the interplanetary magnetic field during the interval spanning the first Cassini fly-through of Saturn’s magnetosphere and its implications for Saturn’s magnetospheric dynamics
Jackman, C. M.; Milan, S. E.; Cowley, S. W. H. +2 more
We examine the interplanetary magnetic field (IMF) data obtained by the Cassini spacecraft during a 5 month period spanning the first fly-through of Saturn's magnetosphere, this interval corresponding to six solar rotations at the spacecraft. It is shown that the structure of the interplanetary medium was consistent with expectations for the decli…
Near-relativistic electron emission following the 28 October 2003 X17 flare
Simnett, G. M.
The 28 October 2003 solar flare event was one of the largest electron events above 50 keV of the current solar cycle. The event was associated with a major flare, at least one fast coronal mass ejection (CME), and a prominence eruption. The evolution of the electron spectrum for this event enables us to resolve three, or possibly four, separate el…