Solar Orbiter/RPW antenna calibration in the radio domain and its application to type III burst observations
| Autor: | M. Steller, Milan Maksimovic, M. Dekkali, E. Lorfèvre, Vratislav Krupar, Antonio Vecchio, Arnaud Zaslavsky, Stuart D. Bale, Yu. V. Khotyaintsev, Vladimir Krasnoselskikh, Štěpán Štverák, Matthieu Kretzschmar, P. L. Astier, Dirk Plettemeier, Xavier Bonnin, Pavel M. Trávníček, J. Soucek, Andris Vaivads, E. Guilhem, T. Chust, Baptiste Cecconi |
|---|---|
| Přispěvatelé: | Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), ALTRAN (FRANCE), Space Sciences Laboratory [Berkeley] (SSL), University of California [Berkeley], University of California-University of California, Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Centre National d'Études Spatiales [Toulouse] (CNES) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
010504 meteorology & atmospheric sciences
Astronomy FOS: Physical sciences Astrophysics 01 natural sciences law.invention Domain (software engineering) Fusion plasma och rymdfysik Orbiter Astronomi astrofysik och kosmologi Physics - Space Physics law Antenna calibration 0103 physical sciences Astronomy Astrophysics and Cosmology Aerospace engineering Instrumentation and Methods for Astrophysics (astro-ph.IM) 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) detectors 0105 earth and related environmental sciences instrumentation Physics Sun: radio radiation business.industry instrumentation: detectors Computer Science::Information Retrieval Sun Astronomy and Astrophysics Fusion Plasma and Space Physics Space Physics (physics.space-ph) Astrophysics - Solar and Stellar Astrophysics solar wind Space and Planetary Science radio radiation Astrophysics - Instrumentation and Methods for Astrophysics business [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 656, pp.A33. ⟨10.1051/0004-6361/202140988⟩ Astronomy & Astrophysics, 656, 1-12 Astronomy & Astrophysics, 656, pp. 1-12 |
| ISSN: | 0004-6361 1432-0746 |
| DOI: | 10.1051/0004-6361/202140988⟩ |
| Popis: | Context.In order to allow for a comparison with the measurements from other antenna systems, the voltage power spectral density measured by the Radio and Plasma waves receiver (RPW) on board Solar Orbiter needs to be converted into physical quantities that depend on the intrinsic properties of the radiation itself (e.g., the brightness of the source).Aims.The main goal of this study is to perform a calibration of the RPW dipole antenna system that allows for the conversion of the voltage power spectral density measured at the receiver’s input into the incoming flux density.Methods.We used space observations from the Thermal Noise Receiver (TNR) and the High Frequency Receiver (HFR) to perform the calibration of the RPW dipole antenna system. Observations of type III bursts by the Wind spacecraft are used to obtain a reference radio flux density for cross-calibrating the RPW dipole antennas. The analysis of a large sample of HFR observations (over about ten months), carried out jointly with an analysis of TNR-HFR data and prior to the antennas’ deployment, allowed us to estimate the reference system noise of the TNR-HFR receivers.Results.We obtained the effective length,leff, of the RPW dipoles and the reference system noise of TNR-HFR in space, where the antennas and pre-amplifiers are embedded in the solar wind plasma. The obtainedleffvalues are in agreement with the simulation and measurements performed on the ground. By investigating the radio flux intensities of 35 type III bursts simultaneously observed by Wind and Solar Orbiter, we found that while the scaling of the decay time as a function of the frequency is the same for the Waves and RPW instruments, their median values are higher for the former. This provides the first observational evidence that Type III radio waves still undergo density scattering, even when they propagate from the source, in a medium with a plasma frequency that is well below their own emission frequency. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|