Matches in SemOpenAlex for { <https://semopenalex.org/work/W4224272034> ?p ?o ?g. }
- W4224272034 endingPage "103" @default.
- W4224272034 startingPage "103" @default.
- W4224272034 abstract "Abstract We report on the presence of numerous tiny bright dots in and around an emerging flux region (an X-ray/coronal bright point) observed with SolO’s EUI/HRI EUV in 174 Å. These dots are roundish and have a diameter of 675 ± 300 km, a lifetime of 50 ± 35 s, and an intensity enhancement of 30% ± 10% above their immediate surroundings. About half of the dots remain isolated during their evolution and move randomly and slowly (<10 km s −1 ). The other half show extensions, appearing as a small loop or surge/jet, with intensity propagations below 30 km s −1 . Many of the bigger and brighter HRI EUV dots are discernible in the SDO/AIA 171 Å channel, have significant emissivity in the temperature range of 1–2 MK, and are often located at polarity inversion lines observed in SDO/HMI LOS magnetograms. Although not as pervasive as in observations, a Bifrost MHD simulation of an emerging flux region does show dots in synthetic Fe ix / x images. These dots in the simulation show distinct Doppler signatures—blueshifts and redshifts coexist, or a redshift of the order of 10 km s −1 is followed by a blueshift of similar or higher magnitude. The synthetic images of O v / vi and Si iv lines, which represent transition region radiation, also show the dots that are observed in Fe ix / x images, often expanded in size, or extended as a loop, and always with stronger Doppler velocities (up to 100 km s −1 ) than that in Fe ix / x lines. Our observation and simulation results, together with the field geometry of dots in the simulation, suggest that most dots in emerging flux regions form in the lower solar atmosphere (at ≈ 1 Mm) by magnetic reconnection between emerging and preexisting/emerged magnetic field. Some dots might be manifestations of magnetoacoustic shocks through the line formation region of Fe ix / x emission." @default.
- W4224272034 created "2022-04-26" @default.
- W4224272034 creator A5012136965 @default.
- W4224272034 creator A5037450222 @default.
- W4224272034 creator A5058078700 @default.
- W4224272034 creator A5079026277 @default.
- W4224272034 creator A5087966566 @default.
- W4224272034 date "2022-04-01" @default.
- W4224272034 modified "2023-10-12" @default.
- W4224272034 title "SolO/EUI Observations of Ubiquitous Fine-scale Bright Dots in an Emerging Flux Region: Comparison with a Bifrost MHD Simulation" @default.
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