Search Publications
Delay in solar energetic particle onsets at high heliographic latitudes
Balogh, A.; Krucker, S.; Dalla, S. +9 more
Ulysses observations have shown that solar energetic particles (SEPs) can easily reach high heliographic latitudes. To obtain information on the release and propagation of SEPs prior to their arrival at Ulysses, we analyse the onsets of nine large high-latitude particle events. We measure the onset times in several energy channels, and plot them v…
On the origin of inner-source pickup ions
Wimmer-Schweingruber, Robert F.; Bochsler, Peter
In situ measurements of pickup ions (PUI) exhibit a component that has nearly thermalized with the solar wind. This implies an origin close to the Sun and is generally ascribed to interaction of the solar wind with interplanetary dust particles (IDPs). We propose a scenario for the origin of inner-source PUIs in which a population of very small ID…
Toroidal-shaped interplanetary disturbance associated with the halo coronal mass ejection event on 14 July 2000
Kojima, Masayoshi; Tokumaru, Munetoshi; Fujiki, Ken'ichi +2 more
Interplanetary scintillation (IPS) measurements made with the 327 MHz radio telescopes of the Solar-Terrestrial Environment Laboratory, Nagoya University, have been used to study a three-dimensional structure of the interplanetary (IP) disturbance associated with the halo coronal mass ejection (CME) event on 14 July 2000 (the so-called "Bastille D…
A Hubble Space Telescope WFPC2 Snapshot Survey of 2MASS-selected Red QSOs
Hines, Dean C.; Armus, Lee; Schmidt, Gary D. +5 more
Using simple infrared color selection, the Two Micron All Sky Survey (2MASS) has found a large number of red, previously unidentified, radio-quiet quasi-stellar objects (QSOs). Although missed by UV/optical surveys, the 2MASS QSOs have Ks-band luminosities that are comparable to ``classical'' QSOs. This suggests the possible discovery o…
Evidence of Flaring in a Transequatorial Loop on the Sun
Harra, Louise K.; Matthews, Sarah A.; van Driel-Gesztelyi, Lidia
We present evidence of flaring behavior in a transequatorial loop (TEL) that lights up in soft X-rays on 2000 July 13. The large loop structure connects NOAA Active Regions 9070/9066 in the northern hemisphere and AR 9069/9068 in the southern hemisphere. We follow the loop systems for 2 days and observe several pieces of evidence strongly suggesti…
Hipparcos red stars in the HpVT2 and VIC systems
Makarov, V. V.; Berdnikov, L. N.; Lebzelter, T. +6 more
For Hipparcos M, S, and C spectral type stars, we provide calibrated instantaneous (epoch) Cousins V - I color indices using newly derived HpVT2 photometry. Three new sets of ground-based Cousins VI data have been obtained for more than 170 carbon and red M giants. These datasets in combination with the published sources of V…
Solar maximum low-energy particle observations at heliographic latitudes above 75 degrees
Lario, D.; Reisenfeld, D. B.; Roelof, E. C. +1 more
We present a preliminary analysis of low-energy particle observations by the Ulysses and ACE spacecraft during the time intervals that Ulysses spent at heliographic latitudes above 75 degrees during its solar maximum orbit. The most southerly and northerly latitudes (80.2°) were reached by Ulysses in November 2000 and October 2001, respectively. T…
H1320+551: a type 1.8/1.9 Seyfert galaxy with an unabsorbed X-ray spectrum
Barcons, X.; Carrera, F. J.; Ceballos, M. T.
We present new optical spectroscopic and XMM-Newton X-ray observations of the active galactic nucleus (AGN) H1320+551. The optical data (consistent with but of better quality than a previously published spectrum) show this source to be a type 1.8/1.9 Seyfert galaxy at z= 0.0653. The narrow-line region is significantly reddened, with a Balmer decre…
Near-IR spectra of ISOGAL sources in the inner Galactic Bulge
Omont, A.; Schultheis, M.; Ojha, D. K. +2 more
We present near-IR spectra (HK-band) of a sample of 107 sources with mid-IR excesses at 7 and 15;mu m detected during the ISOGAL survey. Making use of the DENIS interstellar extinction map from Schultheis et al. (1999) we derive luminosities and find that the Mbol vs. 12CO and M_bol vs. H2O diagrams are powerful to…
What Do the Hubble Space Telescope and Chandra Tell Us about the Jet and the Nuclear Region of the Radio Galaxy 3C 270?
Sparks, William B.; Chiaberge, Marco; Capetti, Alessandro +2 more
The Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph ultraviolet image of the FR I radio galaxy 3C 270 shows the presence of a jetlike structure emerging from the position of the nucleus. This feature, which represents the first jetlike component ever detected in the UV in a radio galaxy with jets lying almost on the plane of the …