A5000006628- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Earthquake Detection and Analysis
- Pulsars and Gravitational Waves Research
- Energy Harvesting in Wireless Networks
- Solar Radiation and Photovoltaics
- Radio Astronomy Observations and Technology
- GNSS positioning and interference
- History and Developments in Astronomy
- earthquake and tectonic studies
- Space exploration and regulation
- Astrophysics and Cosmic Phenomena
- Spacecraft and Cryogenic Technologies
- Dark Matter and Cosmic Phenomena
- Oil, Gas, and Environmental Issues
- Spacecraft Design and Technology
- Magnetic confinement fusion research
- High-pressure geophysics and materials
- Particle Accelerators and Free-Electron Lasers
- Space Satellite Systems and Control
Laboratoire d’études spatiales et d’instrumentation en astrophysique
2010-2020
Sorbonne Université
2003-2020
Université Paris Cité
2003-2020
Centre National de la Recherche Scientifique
1999-2020
Délégation Paris 7
2014-2020
Sorbonne Paris Cité
2020
Université Paris Sciences et Lettres
2018-2020
Janssen (France)
2006-2019
Observatoire de Paris
2001-2015
Université de Versailles Saint-Quentin-en-Yvelines
2003-2015
Using magnetograph measurements, coronal field extrapolations, and imaging observations, we investigate the solar origins of 25 3He-rich particle events from period 1997-2003. In essentially every case find that source impulsive energetic particles (SEPs) lies next to a hole containing Earth-directed open lines. Averaged over all events, source-hole separation is only ~4° at photosphere. The itself typically small, flaring active region located between longitudes ~W25 ~W72. Around estimated...
The Pioneer-6 and Pioneer-7 space probes carried charged-particle telescopes which measure, for the first time, both direction of arrival differential energy spectra protons alpha particles. intensity changes, directional distributions proton fluxes associated with solar activity are investigated. data were obtained in beginning new cycle (no. 20), when it is possible to unambiguously associate proton-flux increases specific active regions. origin, possibly long-term storage, propagation...
We observed the fast coronal mass ejection (CME) of 1998 April 20 with radioheliograph at Nançay, France, between 164 and 432 MHz. Spectroscopic data were obtained 40 800 MHz by spectrometer Tremsdorf, Germany, kHz 14 WAVES instrument on board Wind spacecraft. Energetic particle from 3D Plasma Particle experiment. The CME was in white light Large-Angle Spectrometric COronagraph experiment Solar Heliospheric Observatory For first time, expanding loops are imaged directly radio wavelengths....
Utilizing Yohkoh Soft X-ray Telescope and Nançay radioheliograph data, we present, for the first time, observations of expanding twisted loops a series nonthermal radio bursts that follow loop expansion in time space up to ~12' distance. The were produced during long-duration C4.7 flare close disk center on 1994 October 25 at 1049 UT. observed southern hemisphere above weak positive-polarity region. Kitt Peak magnetogram shows existence negative-polarity region northern same heliolongitude....
A halo coronal mass ejection (CME) was observed at 15:03 UT on 1998 May 2 by the Solar and Heliospheric Observatory Large-Angle Spectrometric Coronagraph. The observation of CME preceded a major soft X-ray flare in NOAA Active Region 8210, characterized delta spot magnetic configuration some activity region 8214. large transequatorial interconnecting loop (TIL) seen X-rays connected AR 8210 to faint field periphery Smaller systems were also connecting other fainter bipolar structures, (IL)...
We report the results of our investigation interplanetary effects caused by large solar flare (X5.7/3B) that occurred on 2000 July 14. In association with this event a bright, fast, halo coronal mass ejection (CME) was observed. The analysis multiwavelength, high-cadence images obtained from Nançay Radioheliograph shows on-disk signatures initiation CME at low-coronal heights, ≤2 R☉. formation inferred radio data indicates nearly developed low corona. white-light and follow-up measurements...
On 2001 April 15, the Nançay radioheliograph observed fast-moving, expanding loops in images taken wavelength range between 164 and 432 MHz. We were able to follow progression of radio loops, starting from a few tenths more than 1 R☉ above solar limb, with time cadence order seconds. The seen agree very well features coronal mass ejection (CME) later, 2.5 white-light by Large Angle Spectrometric Coronagraph (LASCO) experiment on board Solar Heliospheric Observatory (SOHO) spacecraft. event...
We present observational imaging evidence for the existence of metric radio bursts closely associated with front edge coronal mass ejections (CMEs). These drift in frequency similarly to type II bursts. They are weak and usually go undetected on spectrograph data. find same measured projected velocity displacement of, respectively, source (when observed at two or more frequencies) CME leading edge. The position emitting coincides Among events analyzed, fastest them, a over 1400 km s-1, was...
Measurements of the hot plasma environment during Ulysses flyby Jupiter have revealed several new discoveries related to this large rotating astrophysical system. The Jovian magnetosphere was found by be very extended, with day-side magnetopause located at ∼105 radii. heavy ion (sulfur, oxygen, and sodium) population in increased sharply ∼86 This is somewhat more extended than "inner" boundary region identified Voyager measurements. In magnetosphere, fluxes anisotropy direction expected for...
We have identified the sources of six impulsive 3He-rich solar energetic particle events using imaging radio, optical, and ion electron data, together with calculated coronal fields obtained from extrapolating photospheric magnetograms a potential field source surface (PFSS) model. These were all studied in 2006 by Wang et al., who as typically small, flaring active regions lying next to hole containing Earth-directed open lines, located between W33° W65°. By introducing radio data we able...
view Abstract Citations (68) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Solar flare development during the impulsive phase as deduced from correlated radio and hard X-ray observations Raoult, A. ; Pick, M. Dennis, B. R. Kane, S. A correlative study of metric type III/V bursts events preflash phases solar flares is presented. total 55 groups III were observed with Nancay radiospectrograph, 32 these associated detected instruments on ISEE...
The 2001 April 15 event was one of the largest last solar cycle. A former study established that this associated with a coronal mass ejection (CME) observed both at white light and radio frequencies. This CME is illuminated by synchrotron emission from relativistic electrons. In paper, we investigate relation to its extreme-ultraviolet (EUV) white-light counterpart reach four main conclusions. (1) corresponds flux rope cavity. (2) presence reconnecting current sheet behind erupting framed,...
Using multiwavelength imaging observations, in EUV, white light and radio, radio spectral data over a large frequency range, we analyzed the triggering development of complex eruptive event. This one includes two components, an jet coronal mass ejection (CME), which interact during more than 30 minutes, can be considered as physically linked. was unusual The is generated above typical magnetic configuration that has been investigated many former studies related to build-up jets; this...
The Oporto radiospectrograph and the Nançay radioheliograph recorded a radio event on November 6, 1997, closely related in time with flare National Oceanic Atmospheric Administration (NOAA) active region 8100. At beginning of sources are located rather small volume vicinity site. In timescale only few minutes emission sites spread over large corona, covering range 100° heliolatitude. During period Large Angle Spectrometric Coronagraph (LASCO) board Solar Heliospheric Observatory (SOHO)...
We revisit the impulsive beamlike particle events detected in situ from 1997 to 2000 by Electron, Proton, and Alpha Monitor (EPAM) experiment on Advanced Composition Explorer spacecraft. study detail a subset of for which there are radio coronal observations Nançay Radioheliograph. EPAM measures electrons energy range 40 300 keV over wide look directions with better than 1 minute time resolution, while radioheliograph provides images solar corona at five different frequencies cadence eight...
view Abstract Citations (53) References (8) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The association of radio noise storm enhancements with the appearance additional material in corona Kerdraon, A. ; Pick, M. Trottet, G. Sawyer, C. Illing, R. Wagner, W. House, L. Visible light observations have been combined radioheliograph at metric wavelengths to examine dynamic behavior during and after onsets enhancements. For period studied, occurrence such events...