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On the Solar EUV Deposition in the Inner Comae of Comets with Large Gas Production Rates
Anil Bhardwaj
In this letter we have made a comparative study of degradation of solar EUV radiation and EUV-generated photoelectrons in the inner comae of comets having different gas production…
First Terrestrial Soft X-ray Auroral Observation by The Chandra X-ray Observatory
Anil Bhardwaj, G. Randall Gladstone, Ronald F. Elsner +6
Northern auroral regions of Earth were imaged with energetic photons in the 0.1-10 keV range using the High-Resolution Camera (HRC-I) aboard the Chandra X-ray Observatory at 10 epo…
A study of Jupiter's aurorae with XMM-Newton
G. Branduardi-Raymont, A. Bhardwaj, R. F. Elsner +6
We present a detailed analysis of Jupiter's X-ray (0.2-10 keV) auroral emissions as observed by XMM-Newton in Nov. 2003 and compare it with that of an Apr. 2003 observation. We dis…
Latest results on Jovian disk X-rays from XMM-Newton
G. Branduardi-Raymont, A. Bhardwaj, R. F. Elsner +6
We present the results of a spectral study of the soft X-ray emission (0.2-2.5 keV) from low-latitude (`disk') regions of Jupiter. The data were obtained during two observing campa…
X-Ray Emission from Jupiter, Saturn, and Earth: A Short Review
Anil Bhardwaj
Jupiter, Saturn, and Earth - the three planets having dense atmosphere and a well developed magnetosphere - are known to emit X-rays. Recently, Chandra X-ray Observatory has observ…
XMM-Newton observations of X-ray emission from Jupiter
G. Branduardi-Raymont, A. Bhardwaj, R. F. Elsner +6
We present the results of two XMM-Newton observations of Jupiter carried out in 2003 for 100 and 250 ks (or 3 and 7 planet rotations) respectively. X-ray images from the EPIC CCD c…
Discovery of Oxygen Kalpha X-ray Emission from the Rings of Saturn
Anil Bhardwaj, Ronald F. Elsner, J. Hunter Waite +3
Using the Advanced CCD Imaging Spectrometer (ACIS), the Chandra X-ray Observatory (CXO) observed the Saturnian system for one rotation of the planet (~37 ks) on 20 January, 2004, a…
Solar Control on Jupiter's Equatorial X-ray Emissions: 26-29 November 2003 XMM-Newton Observation
Anil Bhardwaj, Graziella Branduardi-Raymont, Ronald F. Elsner +6
During November 26-29, 2003 XMM-Newton observed soft (0.2-2 keV) X-ray emission from Jupiter for 69 hours. The low-latitude X-ray disk emission of Jupiter is observed to be almost…
Radial Distribution of Production Rates, Loss Rates and Densities Corresponding to Ion Masses <=40 amu in the Inner Coma of Comet Halley: Composition and Chemistry
S. A. Haider, Anil Bhardwaj
In this paper we have studied the chemistry of C, H, N, O, and S compounds corresponding to ions of masses <=40 amu in the inner coma of the comet 1P/Halley. The production rates,…
Chandra Observation of an X-ray Flare at Saturn: Evidence for Direct Solar Control on Saturn's Disk X-ray Emissions
Anil Bhardwaj, Ronald F. Elsner, J. Hunter Waite +3
Saturn was observed by Chandra ACIS-S on 20 and 26-27 January 2004 for one full Saturn rotation (10.7 hr) at each epoch. We report here the first observation of an X-ray flare from…
I0-Jupiter system: A unique case of Moon-Planet interaction
A. Bhardwaj, M. Michael
Io and Jupiter constitute a moon-planet system that is unique in our solar system. Io is the most volcanically active planetary body, while Jupiter is the first among the planets i…
Discovery of Soft X-Ray Emission from Io, Europa and the Io Plasma Torus
Ronald F. Elsner, G. Randall Gladstone, J. Hunter Waite +13
We report the discovery of soft (0.25--2 keV) x-ray emission from the Galilean satellites Io and Europa, probably Ganymede, and from the Io Plasma Torus (IPT). Bombardment by energ…