Search Publications
A Flare and Umbral Flashes in a Sunspot
Turova, I. P.; Ozhogina, O. A.; Yurysheva, O. V.
We studied the evolution and dynamic processes in the chromosphere above a sunspot umbra. A relatively rarely occurring phenomenon of bright long-lasting emission observed in the umbra of a unipolar sunspot of the AR 9570 group on August 11, 2001 was investigated. It was found that during the course of the observation, emission was spreading, grad…
Planetary science: The impact of Deep Impact
Feldman, Paul D.
A good look at the Deep Impact cometary encounter was taken by the Rosetta mission, itself on the way to a rendezvous with a comet in 2014. So what is a comet - icy dustball or dusty iceball?
Energetic particle acceleration during a major magnetic storm
Grande, M.; Baker, D.; Blake, J. B. +6 more
We study the global properties of energetic (>30 keV) particles during the main and early recovery phase of a major magnetic storm of March 31, 2001, using data of the NOAA 15 and 16 and the CLUSTER satellites. During the storm main phase the ring current energetic electron and ion fluxes were increased by nearly two orders of magnitude, and th…
Annihilation of positrons in the Galaxy
Sunyaev, R.; Revnivtsev, M.; Sazonov, S. +1 more
Observations of electron-positron annihilation radiation from the Galactic Center region with the SPI instrument aboard INTEGRAL are summarized. The measured width of the 511 keV line and inferred fraction of positrons annihilating through positronium formation are consistent with the annihilation taking place in the warm ISM phase, although combi…
Thermal model of the MUPUS penetrator
Spohn, T.; Banaszkiewicz, M.; Grygorczuk, J. +2 more
The insertion device for the MUPUS penetrator on Phylae, the lander to be set by the Rosetta mission on the nucleus of Tchurumov-Gerasimenko comet, will have to work in extreme environmental condition. The electronic unit inside the device should be kept at the temperature greater than ‑55 °C (220 K) in order to work properly. The expected tempera…
Looking for Discrete UV Absorption Features in the Early-Type Eclipsing Binaries µ1 Scorpii and AO Cassiopeiae
Sahade, J.; Kondo, Y.; Arias, M. L. +1 more
A search for discrete absorption components in the ultraviolet spectra of the early-type binaries µ1 Scorpii and AO Cassiopeiae has been undertaken by analyzing material secured with the International Ultraviolet Explorer satellite during an exclusively assigned interval of nearly 50 hr. While the spectra of µ1 Sc…
The Fine Guidance Sensor Orbit of the G4 Bright Giant HD 173764
Parsons, Sidney B.; Wasserman, Lawrence H.; Franz, Otto G.
TRANS and POS mode observations of the G4 IIa star β Scuti (HD 173764) have been made with a Hubble Space Telescope (HST) Fine Guidance Sensor (FGS3). This spectroscopic binary with a period of 833 days and an eccentricity of 0.36 offered hope of resolving the secondary stellar component and inferring the orbital inclination, distance, and masses,…
Unexpected vertical current sheets in the magnetotail associated with northward IMF
Petrukovich, A. A.; Balogh, A.; Glassmeier, K. -H. +2 more
Fast magnetic field polarity changes detected in the quiet magnetotail by a spacecraft are usually attributed to thin cross-tail current sheet crossings. On September 14, 2001, Cluster registered several such events. However the IMF was northward for the previous 24 h and the formation of a thin current sheet was very unlikely. The multi-point ana…
Preliminary Analysis of <Emphasis Type="BoldItalic">V</Emphasis> and <Emphasis Type="BoldItalic">Hp</Emphasis> Light Curves of 26 Carbon Miras
MikulÁšek, Zdeněk; GrÁf, TomÁš
Light variations of a representative sample of 26 more or less periodically variable carbon stars were analyzed on the basis of 2220 individual observations made by the Hipparcos satellite and 33 544 visual observations listed in AFOEV and VSOLJ databases within the interval JD = 2 448 000 (1988) ±6 cycles. We found the osculating linear ephemerid…
The deepest Hubble Space Telescope far-ultraviolet observations in the Large Magellanic Cloud
Brosch, Noah; Zurek, David; Shara, Michael +1 more
We present a new analysis of the deepest pure-ultraviolet (UV) observations with the highest angular resolution ever performed. A set of 12 exposures with the Hubble Space Telescope (HST) WFPC2 and F160BW filter obtained in parallel observing mode, which cover ~12 arcmin2 in the Large Magellanic Cloud (LMC), north of the bar and in the …