Search Publications
Formation of Radio Type II Bursts During a Multiple Coronal Mass Ejection Event
Valtonen, Eino; Pohjolainen, Silja; Al-Hamadani, Firas
We study the solar event on 27 September 2001 that consisted of three consecutive coronal mass ejections (CMEs) originating from the same active region, which were associated with several periods of radio type II burst emission at decameter-hectometer (DH) wavelengths. Our analysis shows that the first radio burst originated from a low-density env…
Photometric and spectroscopic variability of the B5IIIe star HD 171219
Poretti, E.; Rainer, M.; Uytterhoeven, K. +11 more
We analyzed the star HD 171219, one of the relatively bright Be stars observed in the seismo field of the CoRoT satellite, in order to determine its physical and pulsation characteristics. Classical Be stars are main-sequence objects of mainly B-type, whose spectra show, or have shown at some epoch, Balmer lines in emission and an infrared excess.…
Statistical survey of day-side magnetospheric current flow using Cluster observations: magnetopause
Fornaçon, Karl-Heinz; Glassmeier, Karl-Heinz; Liebert, Evelyn +2 more
We present a statistical survey of current structures observed by the Cluster spacecraft at high-latitude day-side magnetopause encounters in the close vicinity of the polar cusps. Making use of the curlometer technique and the fluxgate magnetometer data, we calculate the 3-D current densities and investigate the magnetopause current direction, lo…
Dual E × B flow responses in the dayside ionosphere to a sudden IMF By rotation
Trattner, K. J.; Eriksson, S.; Baker, J. B. H. +3 more
We report for the first time a dual transition state in the dayside ionosphere following a sudden rotation of the interplanetary magnetic field (IMF) in the upstream magnetosheath from IMF <fi>B</fi><fi>y</fi> < 0 to <fi>B</fi><fi>y</fi> > 0 during <fi>B</fi>
The dusty silhouette jet HH 1019 in the Carina Nebula
Smith, Nathan; Bally, John; Reiter, Megan +1 more
We report the discovery in Hubble Space Telescope (HST) images of the new Herbig-Haro jet, HH 1019, located near the Tr 14 cluster in the Carina Nebula. Like other HH jets in the region, this bipolar collimated flow emerges from the head of a dark dust pillar. However, HH 1019 is unique because - unlike all other HH jets known to date - it is iden…
A deep staring campaign in the σ Orionis cluster. Variability in substellar members
Eislöffel, J.; Scholz, A.; Jayawardhana, R. +2 more
Context. The young star cluster near σ Orionis is one of the primary environments to study the properties of young brown dwarfs down to masses comparable to those of giant planets.
Aims: Deep optical imaging is used to study time-domain properties of young brown dwarfs over typical rotational timescales and to search for new substellar and pl…
X-ray studies of solar system objects: Past, present, and the next decade
Branduardi-Raymont, G.
This paper presents an overview of the remarkable progress that X-ray studies of solar system objects have delivered over the past three decades, covering research that encompasses remote observations with XMM-Newton and Chandra, in situ measurements by planetary missions, and models of solar wind propagation from 1 AU. The future of X-ray explora…
A broad spectral feature detected during the cooling phase of a type I X-ray burst from GRS 1747-312 with Suzaku
Dotani, Tadayasu; Maeda, Yoshitomo; Mori, Hideyuki +3 more
We analyzed the Suzaku archive data of a type I X-ray burst from GRS 1747-312, a low-mass X-ray binary located in the globular cluster Terzan 6. During the Galactic bulge mapping observations with Suzaku, which covered Terzan 6, an X-ray burst of long duration and with moderate photospheric-radius expansion was serendipitously detected and was con…
A Galactic Molecular Cloud Clump Catalog from Hi-GAL Data: Method and Initial Results Comparison with BGPS
Rosolowsky, Erik; Zetterlund, Erika; Glenn, Jason
As the precursors to stellar clusters, it is imperative that we understand the distribution and physical properties of dense molecular gas clouds and clumps. Such a study has been done with the ground-based Bolocam Galactic Plane Survey (BGPS). Now the Herschel infrared GALactic plane survey (Hi-GAL) allows us to do the same with higher-quality da…
Retrieval of Venus' cloud parameters from VIRTIS nightside spectra in the latitude band 25°-55°N
Piccioni, Giuseppe; Grassi, Davide; Magurno, Davide +2 more
Two years of data from the M-channel of the Visible and InfraRed Thermal Imaging Spectrometer (VIRTIS), on board the European Space Agency mission Venus Express operating around the planet Venus, are analysed. Nocturnal data from a nadir viewpoint in the latitude band 25°N-55°N are selected for their configuration advantages and maximisation of th…