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

Lisse, C. M.; Dennerl, K.; Englhauser, J.; Harden, M.; Marshall, F. E.; Mumma, M. J.; Petre, R.; Pye, J. P.; Ricketts, M. J.; Schmitt, J. H. M. M.; Trümper, J.; West, R. G.

doi:10.1126/science.274.5285.205

Cited by 434 publications

(351 citation statements)

References 9 publications

Supporting

Mentioning

343

Contrasting

Order By: Relevance

“…Electron capture in excited states can result in a subsequent decay through emission of photons in the ultra-violet or x-ray regions, which can be the major sources of such photons in very cold atmospheres. In 1996 the observation of x-ray emission from the comet Hyakutake was reported [10]. Being icy bodies, the emission of UV and X-rays from such objects was unexpected.…”

Section: Cometary X-raysmentioning

confidence: 99%

“…Being icy bodies, the emission of UV and X-rays from such objects was unexpected. The origin of such emission is presently considered to be a result of charge exchange processes of highly-charged oxygen ions from the solar wind with water [10][11][12]. For the average velocity of the solar wind ions, the electron capture by O ions occurs into states with high quantum numbers.…”

Section: Cometary X-raysmentioning

confidence: 99%

See 1 more Smart Citation

Primary radicals production from water fragmentation by heavy ions

Montenegro¹,

Luna²

2005

Braz. J. Phys.

View full text Add to dashboard Cite

The importance of fragmentation of water molecules by heavy ions is discussed for several different physical environments, including tumor treatment, planetary sciences and fi ssion reactors. The characteristics of the fragmentation yields by electrons, protons and photons are presented and compared with fragmentation yields of water molecules by C 3+ and O 5+ ions at energies corresponding to the Bragg peak. It is shown that for low energy electron loss and high energy electron capture, the water molecules essentially blow-out, releasing a much larger fraction of O q+ ions as compared with electrons, protons and photons.

show abstract

Section: Cometary X-raysmentioning

confidence: 99%

Section: Cometary X-raysmentioning

confidence: 99%

Primary radicals production from water fragmentation by heavy ions

Montenegro¹,

Luna²

2005

Braz. J. Phys.

View full text Add to dashboard Cite

show abstract

“…The RSntgen Xray Satellite (ROSAT) observed X-ray emissions from comet Hyakutake [Lisse et al, 1996]. Several mechanisms for the emissions were suggested, such as electron bremsstrahlung and scattering of solar X-rays.…”

Section: Introductionmentioning

confidence: 99%

X‐ray imaging of the solar wind—Mars interaction

Holmström¹,

Barabash²,

Kallio³

2001

Geophysical Research Letters

View full text Add to dashboard Cite

Abstract.Wherever the solar wind meets a neutral atmosphere, X-rays are emitted by charge-exchange processes between heavy solar wind ions and the neutrals. Using an empirical model of the proton flow near Mars we present computer simulations of X-ray emissions from this chargeexchange process in Mars' exosphere. We also discuss implications for remote sensing. Here we show that the total X-ray luminosity near Mars from charge-exchange is greater than 10 2s eV/s for typical solar wind conditions. This flux is large enough to be detected by an X-ray satellite in Earth orbit. Thus, Mars belongs to a new class of X-ray objects in the sky, together with other non-magnetized planets, such as Venus.

show abstract

“…and interplanetary neutrals (H, He, etc.) [4,5]. Cravens [6] developed an analytic model that predicted 25% -50% of the soft X-ray background could come from SWCX.…”

Section: Introductionmentioning

confidence: 99%

Line ratios for soft-x-ray emission following charge exchange betweenO8+and Kr

et al. 2017

View full text Add to dashboard Cite

Lyman spectra and line ratios are reported for soft X-ray emissions following the charge exchange process in 293 km/s, 414 km/s, 586 km/s, and 1256 km/s O 8+ and Kr collisions. Lyman series from Ly-α to Ly-ε were resolved for the O 7+ ion using a high resolution X-ray quantum microcalorimeter detector. It is found that the observed line ratios are dependent on the nl distribution of the captured electron, and the Ly-α and Ly-β X-ray emissions are enhanced. Moreover, by comparing the measured line ratios to the constructed theoretical single charge exchange line ratios for O 8+

show abstract

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

Abstract: the result using a 9 x 9 pixel gaussian filter Discovery of X-ray and Extreme (8). T h e HRI and WFC images similar pattern. T h e emission is clearly off-Ultraviolet Emission from set sunward in all ,. imkyges but one. [this .

Cited by 434 publications

References 9 publications

Primary radicals production from water fragmentation by heavy ions

Primary radicals production from water fragmentation by heavy ions

X‐ray imaging of the solar wind—Mars interaction

Line ratios for soft-x-ray emission following charge exchange betweenO8+and Kr

Contact Info

Product

Resources

About