Results 71 to 80 of about 2,361 (168)
The Astrophysical Journal, 1989 Transient coronal EUV emission, recorded in an emission line of Fe XI at 180.4 A, has been observed prior to and during the initial stages of a solar flare. This emission provides direct evidence of the interactions between the lower corona and the chromosphere during flare initiation.
openaire +1 more source
The Astrophysical JournalCoronal mass ejections (CMEs) expel multithermal, magnetized plasma from the Sun, and when directed toward Earth, can cause extensive damage to space and ground-based electronics.
E. M. Wraback +2 more
doaj +1 more source
Impacts of Extreme Ultraviolet Late Phase of the Solar Flare on Ionospheric Electrodynamics
The Astrophysical Journal LettersPrevious investigations of ionospheric electrodynamical responses to solar flares primarily focused on the main phases (MPs) of solar flares. Typical solar irradiance models for driving global ionosphere models do not include the extreme ultraviolet (EUV)
Xuanqing Liu +7 more
doaj +1 more source
The Astrophysical JournalEffects of the extreme-ultraviolet (EUV) late phase of solar flares on the ionosphere were rarely studied. Here we simulated such effects on the ionospheric electron density using an ionosphere−thermosphere coupled model driven by the realistic solar ...
Xuanqing Liu +7 more
doaj +1 more source
Can Solar Limb Flare Prediction Be Properly Made by Extreme-ultraviolet Intensities?
The Astrophysical Journal LettersWe address the question of whether the solar limb flare prediction can be properly made by EUV intensity, which has less projection effects than solar white light and magnetogram data.
Jaewon Lee +4 more
doaj +1 more source
The Astrophysical JournalShocks in the low corona are best observed in the extreme ultraviolet (EUV); however, time-dependent ionization in the postshock region is generally incompatible with the otherwise straightforward plasma diagnostics typically applied to EUV imaging data.
Nicolas Trueba +7 more
doaj +1 more source
Observation and Modeling of Shear Evolution of Post-reconnection Flare Loops
The Astrophysical JournalA solar flare releases magnetic energy by reconnecting field lines across a current sheet, thereby allowing their relaxation to a lower-energy state. The maximum possible energy is released if all field lines relax to a current-free (potential) state ...
Drake Osaben +2 more
doaj +1 more source
Global Coronal Plasma Diagnostics Based on Multislit Extreme-ultraviolet Spectroscopy
The Astrophysical JournalFull-disk spectroscopic observations of the solar corona are highly desired to forecast solar eruptions and their impact on planets and to uncover the origin of solar wind. In this paper, we introduce a new multislit design (five slits) to obtain extreme-
Lami Chan +6 more
doaj +1 more source
How Small-scale Jetlike Solar Events from Miniature Flux Rope Eruptions Might Produce the Solar Wind
The Astrophysical JournalWe consider small-scale jetlike events that might make the solar wind, as has been suggested in recent studies. We show that the events referred to as “coronal jets” and as “jetlets” both fall on a power-law distribution that also includes large-scale ...
Alphonse C. Sterling +2 more
doaj +1 more source
The Astrophysical JournalThe latitudinal structure of the solar wind varies during the cycle of solar activity. Analysis of this variation is important for understanding the solar activity and interpretation of observations of heliospheric energetic neutral hydrogen atoms and ...
C. Porowski, M. Bzowski
doaj +1 more source