Search Publications
Identification of low frequency waves in the vicinity of the terrestrial bow shock
Walker, S. N.; Andre, M.; Balikhin, M. A. +1 more
In this paper, methods for the determination of the wave mode for low frequency waves based on observed differences in phase are reviewed. Examples, using measurements made in the terrestrial foreshock and magnetosheath, are used to illustrate the application of these methods. The use of advance methods such as NARMAX modelling or genetic algorith…
Outbursts in the Be star HR 2501
Carrier, F.; Burki, G.
The Be star
Quiet time MEV electron increases at solar maximum: Ulysses cospin/ket observations
Fichtner, H.; Kunow, H.; Wibberenz, G. +10 more
The Ulysses trajectory provides a unique opportunity to study the propagation of MeV electrons in a wide range of heliographic latitudes and during varying conditions in the inner heliosphere. In recent papers we reported Ulysses Kiel Electron Telescope (KET) observations from the Ulysses launch up to the end of the second fast latitude scan in la…
Optical design of the Optical Monitoring Camera (OMC) of INTEGRAL
Mas-Hesse, J. M.; Renotte, E.; Rochus, P. +5 more
The Optical Monitoring Camera (OMC) will observe the optical emission from the main targets of the gamma-ray instruments onboard the ESA mission INTEGRAL. The OMC is based on a refractive optics with an aperture of 50 mm focused onto a large format CCD (1024 x 2048 pixels), and a field of view of 5degrx5 degr . This paper describes the design of t…
Systematic effects induced on IBIS detectors by background and inhomogeneity of the spatial response
Bird, A. J.; Ubertini, P.; Bazzano, A. +4 more
The spatial distribution of the background events may affect the source detection capability of IBIS at high energies (>=200 keV) for both ISGRI and PICsIT layers. The observed background is found to be variable and spatially structured, and in some cases its properties strongly deviate from the expected statistical behaviour. Background correc…
Continuous tracking of CMEs using MICA, and LASCO C2 and C3 coronagraphs
Schwenn, R.; Stenborg, G.; Balmaceda, L. +3 more
In this work we have tracked coronal mass ejections observed with the ground based Mirror Coronagraph for Argentina (MICA) and the Large Angle and Spectroscopic Coronagraph (LASCO) C2 and C3 on board of the Solar and Heliospheric Observatory (SOHO). The MICA telescope is located at El Leoncito (31.8 S, 69.3 W), San Juan (Argentina), since 1997 as …
Structure of a simple sunspot from the inversion of IR spectral data
Krupp, N.; Woch, J.; Solanki, S. K. +5 more
Analysis of spectral data of two neighboring infrared lines, Fe i 15648.5 Å (g = 3) and Fe i 15652.9 Å (g_eff = 1.53) are carried out for a simple sunspot when it was near the solar disk center (mu = 0.92), to understand the basic structure of sunspot magnetic field. Inversions of Stokes profiles are carried out to derive different atmospheric par…
Differential rotation and meridional flow in the solar supergranulation layer: Measuring the eddy viscosity
Küker, M.; Rüdiger, G.; Chan, K. L.
We measure the eddy viscosity in the outermost layers of the solar convection zone by comparing the rotation law computed with the Reynolds stress resulting from f-plane simulations of the angular momentum transport in rotating convection with the observed differential rotation pattern. The simulations lead to a negative vertical and a positive ho…
Radio observations of the XMM-Newton/Chandra 13hr deep survey field
Page, M. J.; Seymour, N.; Sasseen, T. +9 more
Our VLA observations of the XMM-Newton/Chandra 13hr deep survey field (see Page et al., this proceedings) result in one of the two deepest 1.4GHz radio maps ever made. Within the 15' radius field covered by the deep X-ray data (0.19 deg2), a total of 556 radio sources are detected, down to a 4sigma flux limit of 28mu Jy. Of the 214 Chan…
Coronal loops: Isothermal OR multithermal?
Schmelz, J. T.; Cirtain, J. W.; Beene, J. E. +5 more
Are coronal loops isothermal? A controversy over this question has arisen recently because different investigators using different techniques have obtained very different answers. Analysis of data using narrowband filter ratios to obtain temperature maps has produced several key publications that suggest that coronal loops may be isothermal. We ha…