Coronal Mass Ejections Associated with Slow Long Duration Flares
PBN-AR
Instytucja
Centrum Badań Kosmicznych Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Solar Physics
ISSN
0038-0938
EISSN
1573-093X
Wydawca
SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
Rok publikacji
2013
Numer zeszytu
2
Strony od-do
505-517
Numer tomu
283
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Autorzy
(liczba autorów: 4)
Pozostali autorzy
+ 3
Słowa kluczowe
EN
X-RAY FLARES; ENERGY-RELEASE; ACCELERATION PHASE; LASCO; CME; ERUPTIONS; MODEL; EIT; KINEMATICS; TRANSIENTS
Sun: coronal mass ejections (CMEs); Flares
Open access
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Creative Commons — Uznanie autorstwa
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Język
EN
Treść
It is well known that there is a temporal relationship between coronal mass ejections (CMEs) and associated flares. The duration of the acceleration phase is related to the duration of the rise phase of a flare. We investigate CMEs associated with slow long duration events (LDEs), i.e. flares with the long rising phase. We determined the relationships between flares and CMEs and analyzed the CME kinematics in detail. The parameters of the flares (GOES flux, duration of the rising phase) show strong correlations with the CME parameters (velocity, acceleration during main acceleration phase, and duration of the CME acceleration phase). These correlations confirm the strong relation between slow LDEs and CMEs. We also analyzed the relation between the parameters of the CMEs, i.e. a velocity, an acceleration during the main acceleration phase, a duration of the acceleration phase, and a height of a CME at the end of the acceleration phase. The CMEs associated with the slow LDEs are characterized by high velocity during the propagation phase, with the median equal to 1423 km s(-1). In half of the analyzed cases, the main acceleration was low (a < 300 m s(-2)), which suggests that the high velocity is caused by the prolonged acceleration phase (the median for the duration of the acceleration phase is equal 90 minutes). The CMEs were accelerated up to several solar radii (with the median a parts per thousand aEuro parts per thousand 7 R (aS (TM))), which is much higher than in typical impulsive CMEs. Therefore, slow LDEs may potentially precede extremely strong geomagnetic storms. The analysis of slow LDEs and associated CMEs may give important information for developing more accurate space-weather forecasts, especially for extreme events.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
663126
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