Search Publications
Missions
Journals
Publication Years
Post-flare Ultraviolet Light Curves Explained with Thermal Instability of Loop Plasma
Orlando, S.; Reale, F.; Landi, E.
In the present work, we study the C8 flare that occurred on 2000 September 26 at 19:49 UT and observed by the Solar and Heliospheric Observatory/Solar Ultraviolet Measurement of Emitted Radiation spectrometer from the beginning of the impulsive phase to well beyond the disappearance in the X-rays. The emission first decayed progressively through e…
Uncovering the magnetic environment of our solar system
Ben-Jaffel, L.; Ratkiewicz, R.
Since its formation 4.6 billion years ago, our solar system has most likely crossed numerous magnetized interstellar clouds and bubbles of different sizes and contents on its path through the Milky Way. Having a reference model for how the heliosphere and interstellar winds interact is critical for understanding our current Galactic environment, a…
The Evolution of Plasma Parameters on a Coronal Source Surface at 2.3 R ⊙ during Solar Minimum
Lamy, P.; Strachan, L.; Kohl, J. L. +1 more
We analyze data from the Solar and Heliospheric Observatory to produce global maps of coronal outflow velocities and densities in the regions where the solar wind is undergoing acceleration. The maps use UV and white light coronal data obtained from the Ultraviolet Coronagraph Spectrometer and the Large Angle Spectroscopic Coronagraph, respectivel…
Hydride spectroscopy of the diffuse interstellar medium: new clues on the gas fraction in molecular form and cosmic ray ionization rate in relation to HFormula
Menten, K. M.; Falgarone, E.; Levrier, F. +13 more
Mimas' far-UV albedo: Spatial variations
Johnson, Robert E.; Buratti, Bonnie J.; Hendrix, Amanda R. +7 more
We present Cassini Ultraviolet Imaging Spectrograph (UVIS) observations of Mimas at far-ultraviolet wavelengths (170-190 nm) which show an interesting albedo gradient across the anti-saturnian hemisphere. We discuss the photometric behavior of Mimas in the far-UV and review the important exogenic processes and their expected effects, relevant over…
Venusian middle-atmospheric dynamics in the presence of a strong planetary-scale 5.5-day wave
Yamamoto, Masaru; Takahashi, Masaaki
The middle atmospheric dynamics on Venus are investigated using a middle atmosphere general circulation model. The magnitude of the superrotation is sensitive to the amplitude of the planetary-scale waves. In particular, the critical level absorptions of the forced planetary-scale waves might contribute to the maintenance of the superrotation near…
Ground-based and spacecraft observations of lightning activity on Saturn
Schneider, J.; Cecconi, B.; Fischer, G. +21 more
In late 2007, Saturn electrostatic discharges (SED) were simultaneously observed at the radio telescope UTR-2 and with the Cassini spacecraft. Observations at UTR-2 were performed with a multichannel receiver in the frequency range 12-33 MHz, and those performed on Cassini-with a swept frequency receiver that is part of the RPWS (Radio and Plasma …
White-Light Observations and Polarimetric Analysis of the Solar Corona During the Eclipse of 1 August 2008
Skomorovsky, V. I.; Trifonov, V. D.; Mashnich, G. P. +4 more
In order to study the solar corona during eclipses, a new telescope was constructed. Three coronal images were obtained simultaneously through a single objective of the telescope as the coronal radiation passed through three polarizers (whose transmission directions were turned 0°, 60°, and 120° in the chosen direction); one image was obtained wit…
Coronal Mass Ejections and the Index of Effective Solar Multipole
Obridko, V. N.; Yurchyshyn, V. B.; Ivanov, E. V. +2 more
The paper considers the relationship between the cyclic variations in the velocity of coronal mass ejections (CME) and the large-scale magnetic field structure (LSMF) in cycles 21 - 23. To characterize a typical size of the LSMF structure, we have used the index of the effective solar multipole (ESMI). The cyclic behavior of the CME occurrence rat…
Discovery of multiple shells around the planetary nebula IC 418
Guerrero, M. A.; Ramos-Larios, G.; Bravo-Alfaro, H. +3 more
We have analysed optical, near- and mid-IR images of the bright planetary nebula (PN) IC 418. These images probe unambiguously for the first time a number of low surface brightness structures and shells around the bright main nebula, including radial filaments or rays, a system of three concentric rings and two detached haloes with sizes ∼150 arcs…