FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W4298384299> ?p ?o ?g. }

• W4298384299 endingPage "A67" @default.
• W4298384299 startingPage "A67" @default.
• W4298384299 abstract "Transition region (TR) spectra typically show the Si IV 1402.8 A line to be enhanced by a factor of 5 or more compared to the neighboring O IV 1401.2 A, contrary to predictions of ionization equilibrium models and the Maxwellian distribution of particle energies. Non-equilibrium effects in TR spectra are therefore expected. To investigate the combination of non-equilibrium ionization and high-energy particles, we apply the model of the periodic electron beam, represented by a kappa-distribution that recurs at periods of several seconds, to plasma at chromospheric temperatures of 10^4 K. This simple model can approximate a burst of energy release involving accelerated particles. Instantaneous time-dependent charge states of silicon and oxygen were calculated and used to synthesize the instantaneous and period-averaged spectra of Si IV and O IV. The electron beam drives the plasma out of equilibrium. At electron densities of N_e = 10^10 cm^-3, the plasma is out of ionization equilibrium at all times in all cases we considered, while for a higher density of N_e = 10^11 cm^-3, ionization equilibrium can be reached toward the end of each period, depending on the conditions. In turn, the character of the period-averaged synthetic spectra also depends on the properties of the beam. While the case of kappa = 2 results in spectra with strong or even dominant O IV, higher values of kappa can approximate a range of observed TR spectra. Spectra similar to typically observed spectra, with the Si IV 1402.8 A line about a factor 5 higher than O IV 1401.2 A, are obtained for kappa = 3. An even higher value of kappa = 5 results in spectra that are exclusively dominated by Si IV, with negligible O IV emission. This is a possible interpretation of the TR spectra of UV bursts, although an interpretation that requires a density that is 1-3 orders of magnitude lower than for equilibrium estimates." @default.
• W4298384299 created "2022-10-02" @default.
• W4298384299 creator A5004575215 @default.
• W4298384299 creator A5020621205 @default.
• W4298384299 date "2018-02-01" @default.
• W4298384299 modified "2023-10-15" @default.
• W4298384299 title "Non-equilibrium ionization by a periodic electron beam" @default.
• W4298384299 cites W1492671603 @default.
• W4298384299 cites W1965144158 @default.
• W4298384299 cites W1969477975 @default.
• W4298384299 cites W1970555098 @default.
• W4298384299 cites W1972824034 @default.
• W4298384299 cites W1973133885 @default.
• W4298384299 cites W1976577954 @default.
• W4298384299 cites W1983057338 @default.
• W4298384299 cites W1983393842 @default.
• W4298384299 cites W1989432205 @default.
• W4298384299 cites W1997134502 @default.
• W4298384299 cites W2005737371 @default.
• W4298384299 cites W2011363436 @default.
• W4298384299 cites W2018454770 @default.
• W4298384299 cites W2026934012 @default.
• W4298384299 cites W2027242260 @default.
• W4298384299 cites W2031934011 @default.
• W4298384299 cites W2032773873 @default.
• W4298384299 cites W2045391255 @default.
• W4298384299 cites W2046124827 @default.
• W4298384299 cites W2054561830 @default.
• W4298384299 cites W2057170998 @default.
• W4298384299 cites W2057453691 @default.
• W4298384299 cites W2062192748 @default.
• W4298384299 cites W2063141675 @default.
• W4298384299 cites W2067488469 @default.
• W4298384299 cites W2072084249 @default.
• W4298384299 cites W2077428415 @default.
• W4298384299 cites W2086722473 @default.
• W4298384299 cites W2087617996 @default.
• W4298384299 cites W2087694134 @default.
• W4298384299 cites W2089839141 @default.
• W4298384299 cites W2103583796 @default.
• W4298384299 cites W2112625280 @default.
• W4298384299 cites W2113918997 @default.
• W4298384299 cites W2114774162 @default.
• W4298384299 cites W2115467455 @default.
• W4298384299 cites W2123095582 @default.
• W4298384299 cites W2128359550 @default.
• W4298384299 cites W2144192687 @default.
• W4298384299 cites W2156586457 @default.
• W4298384299 cites W2160807463 @default.
• W4298384299 cites W2163278373 @default.
• W4298384299 cites W2169620320 @default.
• W4298384299 cites W2170614585 @default.
• W4298384299 cites W2271524981 @default.
• W4298384299 cites W2322098729 @default.
• W4298384299 cites W2332613342 @default.
• W4298384299 cites W2461586787 @default.
• W4298384299 cites W2462082019 @default.
• W4298384299 cites W2531677350 @default.
• W4298384299 cites W2552965055 @default.
• W4298384299 cites W2613322844 @default.
• W4298384299 cites W2911868953 @default.
• W4298384299 cites W3098420990 @default.
• W4298384299 cites W3099407398 @default.
• W4298384299 cites W3099538892 @default.
• W4298384299 cites W3099995285 @default.
• W4298384299 cites W3100651894 @default.
• W4298384299 cites W3100697963 @default.
• W4298384299 cites W3100879338 @default.
• W4298384299 cites W3102331789 @default.
• W4298384299 cites W3102358232 @default.
• W4298384299 cites W3103483197 @default.
• W4298384299 cites W3103652788 @default.
• W4298384299 cites W3103852105 @default.
• W4298384299 cites W3103924639 @default.
• W4298384299 cites W3105139878 @default.
• W4298384299 cites W3106291622 @default.
• W4298384299 cites W3124259920 @default.
• W4298384299 cites W3182009799 @default.
• W4298384299 cites W3201501960 @default.
• W4298384299 cites W4300824881 @default.
• W4298384299 cites W4302804395 @default.
• W4298384299 cites W797939743 @default.
• W4298384299 cites W2311545674 @default.
• W4298384299 doi "https://doi.org/10.1051/0004-6361/201731744" @default.
• W4298384299 hasPublicationYear "2018" @default.
• W4298384299 type Work @default.
• W4298384299 citedByCount "8" @default.
• W4298384299 countsByYear W42983842992019 @default.
• W4298384299 countsByYear W42983842992020 @default.
• W4298384299 countsByYear W42983842992021 @default.
• W4298384299 countsByYear W42983842992022 @default.
• W4298384299 countsByYear W42983842992023 @default.
• W4298384299 crossrefType "journal-article" @default.
• W4298384299 hasAuthorship W4298384299A5004575215 @default.
• W4298384299 hasAuthorship W4298384299A5020621205 @default.
• W4298384299 hasBestOaLocation W42983842991 @default.
• W4298384299 hasConcept C120665830 @default.
• W4298384299 hasConcept C121332964 @default.

• next