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LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00003326naa a2200325 4500
001oai:lup.lub.lu.se:7332bd3c-33f7-4f5f-9c0d-60d562945ed4
003SwePub
008210108s2020 | |||||||||||000 ||eng|
024a https://lup.lub.lu.se/record/7332bd3c-33f7-4f5f-9c0d-60d562945ed42 URI
024a https://doi.org/10.3847/2041-8213/abad442 DOI
040 a (SwePub)lu
041 a engb eng
042 9 SwePub
072 7a art2 swepub-publicationtype
072 7a ref2 swepub-contenttype
100a Cliver, E. W.u University of Glasgow4 aut
2451 0a Solar Longitude Distribution of High-energy Proton Flares : Fluences and Spectra
264 c 2020-09-01
264 1b American Astronomical Society,c 2020
520 a The distribution of the longitudes of solar flares associated with the high-energy proton events called ground level events (GLEs) can be approximated by a Gaussian with a peak at ∼W60, with a full range from ∼E90 to ∼W150. The longitudes of flares associated with the top third (24 of 72) of GLEs in terms of their >430 MeV fluences (F 430) are primarily distributed over E20-W100 with a skew toward disk center. This 120 span in longitude is comparable to the latitudinal spans of powerful coronal mass ejections (CMEs) from limb flares. Only 5 of 24 strong GLEs are located within the W40-80 zone of good magnetic connection to Earth. GLEs with hard spectra, i.e., a spectral index SI30/200(= log(F 30/F 200)) < 1.5, also tend to avoid W40-80 source regions. Three-fourths of such events (16 of 21) arise in flares outside this range. The above tendencies favor a CME-driven shock source over a flare-resident acceleration process for high-energy solar protons. GLE spectra show a trend, with broad scatter, from hard spectra for events originating in eruptive flares beyond the west limb to soft spectra for GLEs with sources near central meridian. This behavior can be explained in terms of: (1) dominant near-Sun quasi-perpendicular shock acceleration of protons for far western (>W100) GLEs; (2) quasi-parallel shock acceleration for well-connected (W40-80) GLEs, and (3) proton acceleration/trapping at CME-driven bow shocks from central meridian (E20-W20) that strike the Earth.
650 7a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe
650 7a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng
700a Mekhaldi, F.u Lund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science4 aut0 (Swepub:lu)geol-fme
700a Muscheler, R.u Lund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science4 aut0 (Swepub:lu)geol-rmu
710a University of Glasgowb Kvartärgeologi4 org
773t Astrophysical Journal Lettersd : American Astronomical Societyg 900:1q 900:1x 2041-8205x 2041-8213
856u http://dx.doi.org/10.3847/2041-8213/abad44x freey FULLTEXT
856u https://doi.org/10.3847/2041-8213/abad44
8564 8u https://lup.lub.lu.se/record/7332bd3c-33f7-4f5f-9c0d-60d562945ed4
8564 8u https://doi.org/10.3847/2041-8213/abad44

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Cliver, E. W.
Mekhaldi, F.
Muscheler, R.
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