Response of the low ionosphere to X-ray and Lyman-a solar flare emissions

Autor: Raulin, Jean-Pierre, Trottet, Gérard, Kretzschmar, Matthieu, Macotela, Edith, Pacini, Alessandra, Bertoni, Fernando, Dammasch, Ingolf
Přispěvatelé: Centro de Radio Astronomia e Astrofísica Mackenzie (CRAAM), Universidade Presbiteriana Mackenzie, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-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 Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), 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)-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), Solar-Terrestrial Centre of Excellence [Brussels] (STCE), Comisión Nacional de Investigación y Desarrollo Aeroespacial, Comisión Nacional de Investigación y Desarrollo Aeroespacial (CONIDA), Universidade do Vale do Paraíba, UNIVAP, São José dos Campos, Royal Observatory of Belgium [Brussels] (ROB), MACKPESQUISA and CNPq (Proc. 305655/2010-8)The SAVNET project was funded by FAPESP (Proc. 06/02979) and received partial funds from CNPq (482000/2011-2) and CentreNational de la Recherche Scientifique (CNRS)., European Project: 261948,EC:FP7:SPA,FP7-SPACE-2010-1,ATMOP(2011), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National d’Études Spatiales [Paris] (CNES), CONIDA
Jazyk: angličtina
Rok vydání: 2013
Předmět:
Zdroj: Journal of Geophysical Research Space Physics
Journal of Geophysical Research Space Physics, 2013, 118, pp.570-575. ⟨10.1029/2012JA017916⟩
Journal of Geophysical Research Space Physics, American Geophysical Union/Wiley, 2013, 118, pp.570-575. ⟨10.1029/2012JA017916⟩
ISSN: 2169-9380
2169-9402
DOI: 10.1029/2012JA017916⟩
Popis: International audience; [1] Using soft X-ray measurements from detectors onboard the Geostationary Operational Environmental Satellite (GOES) and simultaneous high-cadence Lyman-a observations from the Large Yield Radiometer (LYRA) onboard the Project for On-Board Autonomy 2 (PROBA2) ESA spacecraft, we study the response of the lower part of the ionosphere, the D region, to seven moderate to medium-size solar flares that occurred in February and March of 2010. The ionospheric disturbances are analyzed by monitoring the resulting sub-ionospheric wave propagation anomalies detected by the South America Very Low Frequency (VLF) Network (SAVNET). We find that the ionospheric disturbances, which are characterized by changes of the VLF wave phase, do not depend on the presence of Lyman-a radiation excesses during the flares. Indeed, Lyman-a excesses associated with flares do not produce measurable phase changes. Our results are in agreement with what is expected in terms of forcing of the lower ionosphere by quiescent Lyman-a emission along the solar activity cycle. Therefore, while phase changes using the VLF technique may be a good indicator of quiescent Lyman-a variations along the solar cycle, they cannot be used to scale explosive Lyman-a emission during flares.
Databáze: OpenAIRE
Externí odkaz: