A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Direct Measurements of Synchrotron-emitting Electrons at Near-Sun Shocks
Tekijät: Jebaraj, I. C.; Agapitov, O. V.; Gedalin, M.; Vuorinen, L.; Miceli, M.; Cohen, C. M. S.; Voshchepynets, A.; Kouloumvakos, A.; Dresing, N.; Marmyleva, A.; Krasnoselskikh, V.; Balikhin, M.; Mitchell, J. G.; Labrador, A. W.; Wijsen, N.; Palmerio, E.; Colomban, L.; Pomoell, J.; Kilpua, E. K. J.; Pulupa, M.; Mozer, F. S.; Raouafi, N. E.; McComas, D. J.; Bale, S. D.; Vainio, R.
Kustantaja: American Astronomical Society
Julkaisuvuosi: 2024
Journal: Astrophysical Journal Letters
Tietokannassa oleva lehden nimi: The Astrophysical Journal Letters
Artikkelin numero: L7
Vuosikerta: 976
Numero: 1
ISSN: 2041-8205
eISSN: 2041-8213
DOI: https://doi.org/10.3847/2041-8213/ad8eb8
Verkko-osoite: http://doi.org/10.3847/2041-8213/ad8eb8
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/470865342
Preprintin osoite: https://arxiv.org/abs/2410.15933
In this study, we present the first-ever direct measurements of synchrotron-emitting heliospheric traveling shocks, intercepted by the Parker Solar Probe (PSP) during its close encounters. Given that much of our understanding of powerful astrophysical shocks is derived from synchrotron radiation, these observations by PSP provide an unprecedented opportunity to explore how shocks accelerate relativistic electrons and the conditions under which they emit radiation. The probe's unparalleled capabilities to measure both electromagnetic fields and energetic particles with high precision in the near-Sun environment has allowed us to directly correlate the distribution of relativistic electrons with the resulting photon emissions. Our findings reveal that strong quasi-parallel shocks emit radiation at significantly higher intensities than quasi-perpendicular shocks due to the efficient acceleration of ultrarelativistic electrons. These experimental results are consistent with theory and recent observations of supernova remnant shocks and advance our understanding of shock physics across diverse space environments.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
Julkaisussa olevat rahoitustiedot:
The Parker Solar Probe spacecraft was designed and built and is now operated by the Johns Hopkins Applied Physics Laboratory as part of NASA's Living with a Star (LWS) program (contract NNN06AA01C). Support from the LWS management and technical team has played a critical role in the success of the Parker Solar Probe mission. The authors express their gratitude to all the instrument teams for their work in processing and publishing the publicly available data from the Parker Solar Probe. The data used in this study are available at the NASA Space Physics Data Facility (SPDF), https://spdf.gsfc.nasa.gov. This research was supported by the International Space Science Institute (ISSI) in Bern through ISSI International Team project No. 23-575, "Collisionless Shock as a Self-Regulatory System." This research was supported through the Visiting Scientist program of the International Space Science Institute (ISSI) in Bern. I.C.J., L.V., and N.D. are grateful for support by the Research Council of Finland (SHOCKSEE, grant No. 346902) and the European Union's (EU's) Horizon 2020 research and innovation program under grant agreement No. 101004159 (SERPENTINE) and No. 101134999 (SOLER). The study reflects only the authors' view, and the European Commission is not responsible for any use that may be made of the information it contains. O.V.A. was partially supported by NSF grant No. 1914670, NASA's Living with a Star (LWS) program (contract 80NSSC20K0218), and NASA grant contracts 80NNSC19K0848, 80NSSC22K0433, and 80NSSC22K0522. O.V.A. and V.V.K. were supported by NASA grants 80NSSC20K0697 and 80NSSC21K1770. L.V. acknowledges the financial support of the University of Turku Graduate School. V.V.K. also acknowledges financial support from CNES through grants "Parker Solar Probe" and "Solar Orbiter." A.K. acknowledges financial support from a NASA NNN06AA01C (PSP EPI-Lo) contract. N.W. acknowledges funding from the Research Foundation—Flanders (FWO—Vlaanderen, fellowship no. 1184319N). E.P. acknowledges support from NASA's Parker Solar Probe Guest Investigators (PSP-GI; grant No. 80NSSC22K0349) and Living With a Star (LWS; grant No. 80NSSC19K0067) programs. E.K. and J.P. acknowledge the Finnish Center of Excellence in Research of Sustainable Space, Project 352850, for supporting this research J.P. acknowledges support from the Research Council of Finland (SWATCH, grant No. 343581). The FIELDS experiment was developed and is operated under NASA contract NNN06AA01C.
