A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
A Detailed Survey of the Parallel Mean Free Path of Solar Energetic Particle Protons and Electrons
Tekijät: Lang, J. T.; Strauss, R. D.; Engelbrecht, N. E.; van den Berg, J. P.; Dresing, N.; Ruffolo, D.; Bandyopadhyay, R.
Kustantaja: IOP Publishing Ltd
Kustannuspaikka: BRISTOL
Julkaisuvuosi: 2024
Journal: Astrophysical Journal
Tietokannassa oleva lehden nimi: ASTROPHYSICAL JOURNAL
Lehden akronyymi: ASTROPHYS J
Artikkelin numero: 105
Vuosikerta: 971
Numero: 1
Sivujen määrä: 15
ISSN: 0004-637X
eISSN: 1538-4357
DOI: https://doi.org/10.3847/1538-4357/ad55c3
Verkko-osoite: https://iopscience.iop.org/article/10.3847/1538-4357/ad55c3
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/457650707
In this work, more than a dozen solar energetic particle (SEP) events are identified where the source region is magnetically well connected to at least one spacecraft at 1 au. The observed intensity-time profiles, for all available proton and electron energy channels, are compared to results computed using a numerical one-dimensional SEP transport model in order to derive the parallel mean free paths (pMFPs) as a function of energy (or rigidity) at 1 au. These inversion results are then compared to theoretical estimates of the pMFP, using observed turbulence quantities with observationally motivated variations as input. For protons, a very good comparison between inversion and theoretical results is obtained. It is shown that the observed inter-event variations in the inversion pMFP values can be explained by natural variations in the background turbulence values. For electrons, there is relatively good agreement with pMFPs derived assuming the damping model of dynamical turbulence, although the theoretical values are extremely sensitive to the details of the turbulence dissipation range, which themselves display a high level of variation.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
