... Authors: Rodriguez, L.; Zhukov, AN; Dasso, S.; Mandrini, CH; Cremades, H.; Cid, C.; Cerrato, ... more ... Authors: Rodriguez, L.; Zhukov, AN; Dasso, S.; Mandrini, CH; Cremades, H.; Cid, C.; Cerrato, Y.; Saiz, E.; Aran, A.; Menvielle, M.; Poedts, S.; Schmieder, B ... information on the origins of the MCs at the Sun and following by the analysis of in-situ observations at 1 AU and at Ulysses. ...
EIT waves (named so after the SOHO/EIT telescope that was used for their discovery) are large-sca... more EIT waves (named so after the SOHO/EIT telescope that was used for their discovery) are large-scale bright fronts propagating in the solar corona in association with coronal mass ejections (CMEs). Their physical nature is still unclear. EIT waves are modeled either as fast-mode magnetosonic waves or invoking several possibilities linked to the magnetic field restructuring during the CME evolution in
Classical externally-occulted coronagraphs are presently limited in their performances by the dis... more Classical externally-occulted coronagraphs are presently limited in their performances by the distance between the external occulter and the front objective. The diffraction fringe from the occulter and the vignetted pupil which degrades the spatial resolution prevent useful observa-tions of the white light corona inside typically 2-2.5 Rsun. Formation flying offers an elegant solution to these limitations and allows conceiving giant,
The main goal of the STEREO mission is to address the three-dimensional structure of the Sun'... more The main goal of the STEREO mission is to address the three-dimensional structure of the Sun's corona, with emphasis in the origin and development of coronal mass ejections (CMEs). SECCHI/EUVI, the extreme ultraviolet imager onboard STEREO, provides full Sun coverage with high cadence and a good spatial resolution. We use EUVI data from both spacecraft in order to obtain information on the height of solar features with respect to the Sun's center. Identification and matching of the same points in both images is done automatically by means of a local correlation tracking (LCT) method, avoiding the user interaction required in normal tie-point methods. From this information, the 3D location of each point can be deduced. The present work describes the principles of the method, the different schemes used and finally, its results applied to case studies of some of the CME-related events observed by STEREO.
The "Solar Influences Data analysis Center" (or... more The "Solar Influences Data analysis Center" (or SIDC) is an operational space weather forecast center, hosted by the Royal Observatory of Belgium. It combines the status of World Data Center (WDC) for the sunspot index and the status of Regional Warning Center (RWC) of the International Space Environment Service (ISES). Moreover, we are also co-I in the EIT-LASCO consortium, two
Originally founded in 1981 as the World Data Centre for the Sunspot Index, the SIDC (Solar Influe... more Originally founded in 1981 as the World Data Centre for the Sunspot Index, the SIDC (Solar Influences Data analysis Centre) shifted to a higher gear in 2000, when it became a Regional Warning Centre of the ISES (taking over this activity from Meudon). The obvious link between space weather and solar activity - a prime research topic of the solar
The SIDC of the Royal Observatory of Belgium is a very active center for solar physics research, ... more The SIDC of the Royal Observatory of Belgium is a very active center for solar physics research, but also provides an operational service for data and services related to solar activity and space weather. In this poster we present the currently available data sets and products, with a focus on recent additions and new developments.
A simple analytical model of the reversal of the heliospheric magnetic field is suggested. The sh... more A simple analytical model of the reversal of the heliospheric magnetic field is suggested. The shape of the heliospheric current sheet is found for each instant of time using a kinematic approximation. Calculation results are illustratively presented in graphic and animated forms, showing a 3-D dynamic picture of the reversal of the heliospheric magnetic field throughout a 22-year solar cycle.
Origin of coronal shock waves is still not completely understood. Since the flare impulsive phase... more Origin of coronal shock waves is still not completely understood. Since the flare impulsive phase and the acceleration phase of a CME are usually well synchronized, it is difficult to give a conclusive answer on the shock wave origin in flare/CME events. We present multiwave-length study of a shock wave associated with the flare event recorded on 14 November 2005. The evolution of the shock wave signature -type II radio burst -is analysed using dynamic spectra recorded by the Green Bank Solar Radio Bursts Spectrometer and Nançay Radioheliograph imaging. The observations of the plasma dynamics in the low and high corona were provided by EIT and LASCO instruments onboard SOHO. The strong type II emission starts at unusually high frequency of 700 MHz. The obtained values for the shock velocity, Alfven velocity and Alfven Mach number are in the range of typical shock parameters. The shock wave was closely associated with the impulsive phase of the compact M3.9 flare in the NOAA AR 10822...
... Authors: Rodriguez, L.; Zhukov, AN; Dasso, S.; Mandrini, CH; Cremades, H.; Cid, C.; Cerrato, ... more ... Authors: Rodriguez, L.; Zhukov, AN; Dasso, S.; Mandrini, CH; Cremades, H.; Cid, C.; Cerrato, Y.; Saiz, E.; Aran, A.; Menvielle, M.; Poedts, S.; Schmieder, B ... information on the origins of the MCs at the Sun and following by the analysis of in-situ observations at 1 AU and at Ulysses. ...
EIT waves (named so after the SOHO/EIT telescope that was used for their discovery) are large-sca... more EIT waves (named so after the SOHO/EIT telescope that was used for their discovery) are large-scale bright fronts propagating in the solar corona in association with coronal mass ejections (CMEs). Their physical nature is still unclear. EIT waves are modeled either as fast-mode magnetosonic waves or invoking several possibilities linked to the magnetic field restructuring during the CME evolution in
Classical externally-occulted coronagraphs are presently limited in their performances by the dis... more Classical externally-occulted coronagraphs are presently limited in their performances by the distance between the external occulter and the front objective. The diffraction fringe from the occulter and the vignetted pupil which degrades the spatial resolution prevent useful observa-tions of the white light corona inside typically 2-2.5 Rsun. Formation flying offers an elegant solution to these limitations and allows conceiving giant,
The main goal of the STEREO mission is to address the three-dimensional structure of the Sun'... more The main goal of the STEREO mission is to address the three-dimensional structure of the Sun's corona, with emphasis in the origin and development of coronal mass ejections (CMEs). SECCHI/EUVI, the extreme ultraviolet imager onboard STEREO, provides full Sun coverage with high cadence and a good spatial resolution. We use EUVI data from both spacecraft in order to obtain information on the height of solar features with respect to the Sun's center. Identification and matching of the same points in both images is done automatically by means of a local correlation tracking (LCT) method, avoiding the user interaction required in normal tie-point methods. From this information, the 3D location of each point can be deduced. The present work describes the principles of the method, the different schemes used and finally, its results applied to case studies of some of the CME-related events observed by STEREO.
The "Solar Influences Data analysis Center" (or... more The "Solar Influences Data analysis Center" (or SIDC) is an operational space weather forecast center, hosted by the Royal Observatory of Belgium. It combines the status of World Data Center (WDC) for the sunspot index and the status of Regional Warning Center (RWC) of the International Space Environment Service (ISES). Moreover, we are also co-I in the EIT-LASCO consortium, two
Originally founded in 1981 as the World Data Centre for the Sunspot Index, the SIDC (Solar Influe... more Originally founded in 1981 as the World Data Centre for the Sunspot Index, the SIDC (Solar Influences Data analysis Centre) shifted to a higher gear in 2000, when it became a Regional Warning Centre of the ISES (taking over this activity from Meudon). The obvious link between space weather and solar activity - a prime research topic of the solar
The SIDC of the Royal Observatory of Belgium is a very active center for solar physics research, ... more The SIDC of the Royal Observatory of Belgium is a very active center for solar physics research, but also provides an operational service for data and services related to solar activity and space weather. In this poster we present the currently available data sets and products, with a focus on recent additions and new developments.
A simple analytical model of the reversal of the heliospheric magnetic field is suggested. The sh... more A simple analytical model of the reversal of the heliospheric magnetic field is suggested. The shape of the heliospheric current sheet is found for each instant of time using a kinematic approximation. Calculation results are illustratively presented in graphic and animated forms, showing a 3-D dynamic picture of the reversal of the heliospheric magnetic field throughout a 22-year solar cycle.
Origin of coronal shock waves is still not completely understood. Since the flare impulsive phase... more Origin of coronal shock waves is still not completely understood. Since the flare impulsive phase and the acceleration phase of a CME are usually well synchronized, it is difficult to give a conclusive answer on the shock wave origin in flare/CME events. We present multiwave-length study of a shock wave associated with the flare event recorded on 14 November 2005. The evolution of the shock wave signature -type II radio burst -is analysed using dynamic spectra recorded by the Green Bank Solar Radio Bursts Spectrometer and Nançay Radioheliograph imaging. The observations of the plasma dynamics in the low and high corona were provided by EIT and LASCO instruments onboard SOHO. The strong type II emission starts at unusually high frequency of 700 MHz. The obtained values for the shock velocity, Alfven velocity and Alfven Mach number are in the range of typical shock parameters. The shock wave was closely associated with the impulsive phase of the compact M3.9 flare in the NOAA AR 10822...
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Papers by Andrei Zhukov