Search Publications
Initiation of CMEs associated with filament eruption, and the nature of CME related shocks
Fainshtein, V. G.; Egorov, Ya. I.
Using data from SDO, PROBA2 and other spacecraft, Fainshtein and Egorov (2013) have discovered processes accompanying initiation of six limb CMEs and have studied features of their motion. The said CMEs occurred after eruption of prominence or hot emission loop and were associated with X-ray flares. The follow-up study of the CMEs, associated with…
Solar cycle variations in the powers and damping rates of low-degree solar acoustic oscillations
Nakariakov, V. M.; Broomhall, A. -M.; Pugh, C. E.
Helioseismology uses the Sun's natural resonant oscillations to study the solar interior. The properties of the solar oscillations are sensitive to the Sun'2019;s magnetic activity cycle. Here we examine variations in the powers, damping rates, and energy supply rates of the most prominent acoustic oscillations in unresolved, Sun-as-a-star data, o…
How do fast impulse CMEs related to powerful flares but unrelated to eruptive filaments appear and move?
Fainshtein, V. G.; Zagainova, Iu. S.
GOES-12/SXI and SDO/AIA data were used to examine the formation and initial stage of movement for several fast pulse 'halo'-type coronal mass ejections (HCMEs) that were related to GOES M and X class flares but unrelated to solar filament eruptions. According to their formation, the HCMEs under study can be subdivided into three groups: (i) Most o…
Transit time of CME/shock associated with four major geo-effective CMEs in solar cycle 24
Shanmugaraju, A.; Syed Ibrahim, M.; Bendict Lawrance, M.
The kinematics of coronal mass ejection (CME) in the interplanetary medium is very important in the concept of space-weather. Main aim of this paper is to study the propagation of four major geo-effective CMEs and their associated shocks observed in solar cycle 24. The arrival of interplanetary shocks and CMEs of these events near the Earth is see…
Filaments disappearance in relation to coronal mass ejections during the solar cycle 23
Mawad, R.; Shaltout, Mosalam; Yousef, M. +2 more
We have studied the relationship between filament disappearances with CMEs during solar period 1996-2010. We used the observed disappearing filaments in Hα data from Meudon given in NOAA, and coronal mass ejections data (CMEs) from SOHO/LASCO. We obtained 278 CME events (14%) contemporary filament disappearances and CME ejections (from a total of …
Eruption of the magnetic flux rope in a quick decaying active region
Yang, Shangbin; Liu, Jihong; Xie, Wenbin
An isolated and quickly decaying active region (NOAA 9729) was observed as it passed across the solar disk. There was only one CME associated with the active region, which provides a good opportunity to investigate the whole process of the CME. A filament in this active region was observed to rise rapidly before stalling and disintegrating into fl…
Powerful non-geoeffective interplanetary disturbance of July 2012 observed by muon hodoscope URAGAN
Veselovsky, I. S.; Astapov, I. I.; Barbashina, N. S. +2 more
The most powerful coronal mass ejection of the 24th solar cycle took place on the opposite side of the Sun on July 23, 2012 and had no geomagnetic consequences. Nevertheless, as a result of passing of the ejection through the heliosphere, variations of galactic cosmic rays flux were observed on the Earth. These variations were registered by the mu…
Shock wave driven by CME evidenced by metric type II burst and EUV wave
Selhorst, C. L.; Cunha-Silva, R. D.; Fernandes, F. C. R.
Solar type II radio bursts are produced by plasma oscillations in the solar corona as a result of shock waves. The relationship between type II bursts and coronal shocks is well evidenced by observations since the 1960s. However, the drivers of the shocks associated with type II events at metric wavelengths remain as a controversial issue among so…