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Disks around hot stars in the Trifid nebula
Cernicharo, J.; Cesarsky, D.; Lefloch, B. +2 more
We report on mid-IR observations of the central region in the Trifid nebula, carried out with ISOCAM in several broad-band infrared filters and in the low resolution spectroscopic mode provided by the circular variable filter. Analysis of the emission indicates the presence of a hot dust component (500 to 1000 K) and a warm dust component at lower…
Markarian 478: A Second Seyfert Galaxy with 1 Micron Fe II Emission Lines
Hamann, F.; Rudy, Richard J.; Puetter, R. C. +3 more
We present infrared spectroscopy of the narrow-line Seyfert 1 galaxy Mrk 478 that shows the 1 µm Fe II lines λ9997, λ10501, λ10863, and λ11126. This is the second active galaxy, after I Zw 1, in which these features have been observed. Like I Zw 1, the 1 µm Fe II lines of Mrk 478 appear to arise from collisional excitation of their com…
Shocking Clouds in the Cygnus Loop
Graham, James R.; Levenson, N. A.
With Hubble Space Telescope Wide-Field Planetary Camera 2 observations of the Cygnus Loop supernova remnant, we examine the interaction of an interstellar cloud with the blast wave on physical scales of 1015 cm. The shock front is distorted, revealing both edge-on and face-on views of filaments and diffuse emission, similar to those obs…
A study of the chromospherically active binaries UX Fornacis and AG Doradus
Strassmeier, K. G.; Washuettl, A.
This paper presents a time-series spectrum analysis of the two chromospherically active binary stars, UX Fornacis and AG Doradus. To investigate the rotational behaviour, in combination with activity in the Hα line, we obtained almost 40 high-resolution, high-S/N spectra for each system. Both binaries, UX For and AG Dor, show Hα of the primary sta…
Erupting Magnetic Structures observed with SOHO/LASCO
Simnett, G. M.; Lyons, M. A.
We report observations, from March 1999 to December 1999, of slow-moving, low-mass (≲1014 g) erupting structures. The 20 events seen in this period appear with a double or multiple loop structure. Their speeds range from approximately 10 to 60 km s−1. There are no significant associated flares or radio signatures. Although th…
First Cluster results of the magnetic field structure of the mid- and high-altitude cusps
Balogh, A.; Dunlop, M. W.; Cargill, P. J. +1 more
Magnetic field measurements from the four Cluster spacecraft from the mid- and high-altitude cusp are presented. Cluster underwent two encounters with the mid-altitude cusp during its commissioning phase (24 August 2000). Evidence for field-aligned currents (FACs) was seen in the data from all three operating spacecraft from northern and southern …
The Cassini/Huygens Venus and earth flybys: An overview of operations and results
Burton, M. E.; Matson, D. L.; Buratti, B. +1 more
The Cassini/Huygens spacecraft flew by Venus on June 24, 1999, and the Earth on August 18, 1999. These two events provided the Cassini Project with its first opportunities to design coordinated scientific observations at planetary encounters. In addition to exercising capabilities of the science instruments as well as the spacecraft and performing…
Large-scale energetic particle layers in the high latitude Jovian magnetosphere
Anagnostopoulos, G. C.; Karanikola, I.; Marhavilas, P.
This study presents an analysis of long lasting (∼2- 3 h) energetic (≳60 keV) ion and (≳40 keV) electron events observed by the HISCALE instrumentation on board Ulysses in the high latitude Jovian magnetosphere. The high latitude events in the prenoon dayside (d 36-38, 1992) and the south duskside (d 40-43, 1992) magnetosphere are different from t…
The transport of energetic particles and cosmic rays in the heliosphere
Giacalone, J.; Jokipii, J. R.
We discuss recent observations of energetic particles and cosmic rays lending insight into how these particles are influenced by the interplanetary magnetic field and what can be learned about the field itself by using the energetic particles as probes. Two recent observations on which we focus attention are those by Ulysses at high heliographic l…
An overview of observations by the Cassini radio and plasma wave investigation at earth
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +6 more
On August 18, 1999, the Cassini spacecraft flew by Earth at an altitude of 1186 km on its way to Saturn. Although the flyby was performed exclusively to provide the spacecraft with sufficient velocity to get to Saturn, the radio and plasma wave science (RPWS) instrument, along with several others, was operated to gain valuable calibration data and…