Discovery of X-ray and Extreme Ultraviolet Emission from Comet C/Hyakutake 1996 B2

  title={Discovery of X-ray and Extreme Ultraviolet Emission from Comet C/Hyakutake 1996 B2},
  author={Casey M. Lisse and Konrad Dennerl and Jakob Englhauser and M. Harden and F. E. Marshall and Michael J. Mumma and Robert Petre and John P. Pye and M. J. Ricketts and J{\"u}rgen H. M. M. Schmitt and Joachim E. Tr{\"u}mper and Robert West},
  pages={205 - 209}
During its close approach to Earth, comet C/Hyakutake 1996 B2 was observed at extreme ultraviolet and x-ray wavelengths with the Rœntgen X-ray Satellite and Rossi X-ray Timing Explorer. The emission morphology was symmetric with respect to a vector from the comet's nucleus toward the sun, but not symmetric around the direction of motion of the comet with respect to interplanetary dust. A slowly varying emission and a large impulsive event that varied on time scales of 1 to 2 hours were observed… 

Generation of X-rays from Comet C/Hyakutake 1996 B2

Observations of spectral resolution of the x-rays should provide more insight into the composition of the comet and the inferred x-ray photon power depends on the electron energy, with keV electrons providing values of photon power two orders of magnitude greater than 100 eV electrons.

X-ray and extreme ultraviolet emission from comets

The discovery of high energy X-ray emission in 1996 from C/1996 B2 (Hyakutake) has created a surprising new class of X-ray emitting objects. The original discovery (Lisse et al., 1996) and subsequent

Modeling of cometary X-rays caused by solar wind minor ions.

Using the plasma flow in the coma of Hyakutake calculated by a three-dimensional adaptive magnetohydrodynamic model, the density distribution of solar wind ions inThe coma and the resulting x-ray emission were computed and the calculated High Resolution Imager count rate and the spatial distribution of the x-rays agree with the observations.

X-Ray and Extreme Ultraviolet Emission from Comet P/Encke 1997

In an effort to understand the newly discovered phenomenon of cometary X-ray emission, we have obtained observations of the short period (3.3 years), well-studied comet 2P/Encke (Encke) during its

X-ray Emission from Comets

Theoretical and observational work has demonstrated that charge-exchange collisions of highly charged solar wind ions with cometary neutral species can explain the x-ray emission from comet Hyakutake.

Plasma astrophysics implication in discovery and interpretation of X-ray radiation from comets

  • S. Ibadov
  • Physics
    Proceedings of the International Astronomical Union
  • 2010
Abstract Discovery of soft X-ray radiation from comet Hyakutake C/1996 B2 by space telescope ROSAT in March 1996 as well as establishing the regularity of the phenomenon for comets in general opened

The relation of temporal variations of soft X‐ray emission from comet Hyakutake to variations of ion fluxes in the solar wind

Both the Rontgen X-Ray Satellite (ROSAT) and the Extreme Ultraviolet Explorer (EUVE) have detected soft X-ray emission from comet C/Hyakutake 1996 B2. This emission varied by a factor of about 2 over

A Possible Source of the X-Rays from Comet Hyakutake

The soft X rays from Comet Hyakutake observed by Lisseet al.(1996,Science274, 205–209) can reasonably be attributed to electron–neutral and electron–dust collisions. The neutrals and dust come from

Swift X-Ray Telescope Observations of the Deep Impact Collision

Comet 9P/Tempel 1 was observed by the Swift X-Ray Telescope (XRT) for a total of 250,024 s. Soft X-ray emission, 0.2-1.0 keV, was seen as a diffuse extended halo with an FWHM of 1.03 × 105 km

Detection Of Soft X-Ray Emission From Comet C/1995 O1 (Hale–Bopp)

We report the detection of soft X-rays from comet C/1995 O1 (Hale-Bopp) by the Low Energy Concentrator Spectrometer (LECS) on-board the X-ray satellite, BeppoSAX. The observations took place on 1996



A soft X-ray image of the Moon

A soft X-ray image of the Moon obtained by the Röntgen Observatory Satellite ROSAT clearly shows a sunlit crescent, demonstrating that the Moon's X-ray luminosity arises from backscattering of solar

The interaction of active comets with the solar wind

The interaction of the solar wind with active comets is investigated based on observations of cometary plasma processes and studies of comets using telescopes and photographic plates. Data were also

The pick-up of cometary protons by the solar wind

The HERS detector of the Ion Mass Spectrometer on the Giotto spacecraft measured the 3-dimensional distribution of picked-up cometary protons over a distance of ~8 million km upstream of the bow

Ion composition and dynamics at comet Halley

The ion mass spectrometer aboard the Giotto spacecraft measured the composition and velocity distributions of cometary ions at distances of ∼7.5×l06 to ∼1,300 km from the nucleus of comet Halley.

Combined first‐ and second‐order Fermi acceleration in cometary environments

Our two-dimensional (one velocity space and one spatial dimension), time-dependent model calculations indicate that an interplay between velocity and spatial diffusion may be responsible for the

The GOES-8 spacecraft is located in geosychronous orbit inside the Earth's magnetosheath, and 25