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Periodicities Near 160 Minutes in Flare Occurrence
Bai, Taeil
The 160.01-min periodicity was originally found from line-of-sight velocities of the photosphere, and Kotov and Tsap reported a detection of the same periodicity in flare occurrence times. Intrigued by this, I analyze occurrence times of flares of cycles 19-23 to investigate periodicities in the neighborhood of 160 min, cycle by cycle. The 160.01-…
Solar Observations at Submillimeter Wavelengths
Kaufmann, P.
We review earlier to recent observational evidences and theoretical motivations leading to a renewed interest to observe flares in the submillimeter (submm) - infrared (IR) range of wavelengths. We describe the new solar dedicated submillimeter wave telescope which began operations at El Leoncito in the Argentina Andes: the SST project. It consist…
High-Redshift Candidates and the Nature of Small Galaxies in the Hubble Deep Field
Thompson, Rodger I.; Weymann, Ray J.; Storrie-Lombardi, Lisa J.
We present results on two related topics: (1) a discussion of high-redshift candidates (z>4.5) and (2) a study of very small galaxies at intermediate redshifts, both sets being detected in the region of the northern Hubble Deep Field (HDF) covered by the deep NICMOS observations at 1.6 and 1.1 µm. The high-redshift candidates are just tho…
IUE observations of beta Cephei stars. Paper 2: Beta Cephei
Lloyd, C.; Stickland, D.
On the heliolatitudinal variation of the galactic cosmic-ray intensity. Comparison with Ulysses measurements
Moussas, X.; Exarhos, G.
We study the dependence of cosmic rays with heliolatitude using a simple method and compare the results with the actual data from Ulysses and IMP spacecraft. We reproduce the galactic cosmic-ray heliographic latitudinal intensity variations, applying a semi-empirical, 2-D diffusion-convection model for the cosmic-ray transport in the interplanetar…
Preliminary analysis of light curves of seven carbon stars
Mikulášek, Z.; Dušek, J.; Papoušek, J.
We present a preliminary analysis of the light curves of the following carbon stars: WZ Cas, VY UMa, Y CVn, RY Dra, T Lyr, HK Lyr and TT Cyg, constructed on the basis of our own BV photoelectric observations obtained at the Brno Observatory in 1979-94 and Hipparcos observations. The analysis suggests that "semiregular" light curves of all studied …
Possibilities for Detecting Extinct Radio Pulsars
Beskin, V. S.; Yeliseyeva, S. A.
We explore the possibilities for detecting pulsars that have ceased to radiate in the radio band. We consider two models: the model with hindered particle escape from the pulsar surface [first suggested by Ruderman and Sutherland (1975)] and the model with free particle escape (Arons 1981; Mestel 1999). In the model with hindered particle escape, …
Solar Flares of Various Types and Their Effect on the Formation of Interplanetary Medium Disturbances
Belov, A. V.; Livshits, M. A.; Osokin, A. R.
Factors that could produce the statistical relationship observed between the duration of transient processes on the Sun and the power of corresponding disturbances of the interplanetary medium are investigated. Uniform data on the soft X-radiation of more than 50000 flares made it possible to study their number distribution according to duration i…
Beyond the Hubble Deep Field Limiting Magnitude: Faint Galaxy Number Counts from Surface Brightness Fluctuations
Marín-Franch, A.; Aparicio, A.
The faint end of the differential galaxy number counts n(m) in the Hubble Deep Field-North (HDF-N) has been determined for the F450W, F606W, and F814W filters by means of surface brightness fluctuation measurements. This technique allows us to explore n(m) beyond the limiting magnitude of the HDF, providing new, stronger constraints on the faint e…
Modeling a Few-MeV Jovian and Galactic Electron Spectra in the Inner Heliosphere
Ferreira, S. E. S.; Potgieter, M. S.; Henize, Vance K.
A three-dimensional numerical modulation model, based on the transport equation, is used to model the transport of a few-MeV electrons in the inner heliosphere. In particular the modulation of jovian and galactic electrons is studied with emphasis on explaining the 3-10 MeV Ulysses/KET observations after mid1998. Analysis of SOHO/CST 4 MeV electro…