Search Publications
The SOHO CELIAS/SEM EUV database from SC23 minimum to the present
Judge, D. L.; Ogawa, H. S.; Pap, J. M. +2 more
The SOHO Solar EUV Monitor has been in operation since December 1995 onboard the SOHO spacecraft. This instrument is a highly stable transmission grating solar extreme ultraviolet spectrometer. It has made nearly continuous full disk solar irradiance measurements both within an 8 nm bandpass centered at 30.4 nm and throughout the 0.1 to 50 nm sola…
The inner solar corona seen by SUMER, LASCO/C1, and EIT: Electron densities and temperatures during the rise of the new solar cycle
Inhester, B.; Wilhelm, K.; Newmark, J. S.
Detailed investigations of the corona and the source regions of the solar wind have become possible with spectroscopic and imaging instruments on the Solar and Heliospheric Observatory (SOHO). We present observations in the extreme ultraviolet (EUV), pertinent to the generation of the slow solar wind, which were obtained by the Solar Ultraviolet M…
Optical monitoring of the gravitationally lensed quasar Q2237+0305 from APO between June 1995 and January 1998
Stanek, K. Z.; Malhotra, S.; Rhoads, J. E. +12 more
We present a data set of images of the gravitationally lensed quasar Q2237+0305, that was obtained at the Apache Point Observatory (APO) between June 1995 and January 1998. Although the images were taken under variable, often poor seeing conditions and with coarse pixel sampling, photometry is possible for the two brighter quasar images A and B wi…
Statistical Correlations between Solar Microwave Bursts and Coronal Mass Ejections
Dougherty, Brian L.; Zirin, Harold; Hsu, Kathryn
We compare listings of coronal mass ejections (CMEs) observed by LASCO on SOHO and solar microwave bursts (SMBs) recorded by the Radio Solar Telescope Network (RSTN) operated by the United States Air Force. These data sets are the product of stable and continuous observations of the whole Sun and provide suitable bases for robust statistical studi…
The Abundance of Atomic Sulfur in the Atmosphere of Io
Feldman, Paul D.; McGrath, Melissa A.; Feaga, Lori M.
Observations with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope have been used to constrain the atomic sulfur column density in Io's atmosphere. The S I λ1479 dipole allowed and forbidden transition multiplets have been resolved for the first time at Io, enabling the study of both optically thick and thin transitions f…
Photoelectric Heating and [C II] Cooling of High Galactic Latitude Translucent Clouds
Reach, William T.; Ingalls, James G.; Bania, T. M.
The (2P3/2-->2P1/2) transition of singly ionized carbon, [C II], is the primary coolant of diffuse interstellar gas. We describe observations of [C II] emission toward nine high Galactic latitude translucent molecular clouds, made with the long-wavelength spectrometer on board the Infrared Space Obser…
Evaluation of solar Type II radio burst estimates of initial solar wind shock speed using a kinematic model of the solar wind on the April 2001 solar event swarm
Dryer, M.; Smith, Z.; Fry, C. D. +5 more
We compare simulation results of real time shock arrival time prediction with observations by the ACE satellite for a series of solar flares/coronal mass ejections which took place between 28 March and 18 April, 2001 on the basis of the Hakamada-Akasofu-Fry, version 2 (HAFv.2) model. It is found, via an ex post facto calculation, that the initial …
Star Formation in the Infrared Space Observatory Atlas of Bright Spiral Galaxies
Bendo, George J.; Leech, Kieron; Metcalfe, Leo +11 more
We investigate star formation along the Hubble sequence using the Infrared Space Observatory Atlas of Bright Spiral Galaxies. Using mid-infrared and far-infrared flux densities normalized by K-band flux densities as indicators of recent star formation, we find several trends. First, star formation activity is stronger in late-type (Sc-Scd) spirals…
A study of the radial velocity of the star theta 1 Ori C.
Vitrichenko, E. A.
An X-ray view of the active nucleus in NGC 4258
Pietsch, W.; Read, A. M.
XMM-Newton observed the Seyfert 1.9 galaxy