72 citations · 554 across the 29 of their papers we have counts for
26 papers · 1 filter
Polar regions activity and the prediction of the height of the solar cycle 25
S. Koutchmy, B. Filippov, E. Tavabi +2
The forthcoming solar cycle (SC) 25 was beleived to be rather low when using the sunspot number (SN) as a measurement of the level of activity. The most popular prediction was made…
Critical decay index for eruptions of 'short' filaments
Boris Filippov
Model of a partial current-carrying torus loop anchored to the photosphere is analyzed. Conditions of the catastrophic loss of equilibrium are considered and corresponding value of…
Mass of prominences experiencing failed eruptions
B. Filippov
A number of solar filaments/prominences demonstrate failed eruptions, when a filament at first suddenly starts to ascend and then decelerates and stops at some greater height in th…
Failed prominence eruptions near 24 cycle maximum
B. Filippov
We analyze 16 failed filament eruptions observed near 24 solar cycle maximum from May 2013 to July 2014. No significant rotation of filament spines is observed during the ascent in…
Solar Total Eclipse of 21 August 2017: Study of the Inner Corona Dynamical Events Leading to a CME
Boris Filippov, Serge Koutchmy, Nicolas Lefaudeux
Total solar eclipse (TSE) coronal large and small scale events were reported in the historical literature but a definite synoptic coverage was missing for studying a relationship w…
Difference of source regions between fast and slow coronal mass ejections
B. Filippov
Coronal mass ejections (CMEs) are tightly related to filament eruptions and usually are their continuation in the upper solar corona. It is common practice to divide all observed C…
Horizontal photospheric flows trigger a filament eruption
T. Roudier, B. Schmieder, B. Filippov +2
A large filament composed principally of two sections erupted sequentially in the southern hemisphere on January 26 2016. The central, thick part of the northern section was first…
Solar coronal loop dynamics near the null point above active region NOAA 2666
Boris Filippov
We analyse observations of a saddle-like structure in the corona above the western limb of the Sun on 2017 July 18. The structure was clearly outlined by coronal loops with typical…
Flux Rope Breaking and Formation of a Rotating Blowout Jet
Navin Chandra Joshi, Naoto Nishizuka, Boris Filippov +2
We analyzed a small flux rope eruption converted into a helical blowout jet in a fan-spine configuration using multi-wavelength observations taken by SDO, which occurred near the l…
Two-step solar filament eruptions
Boris Filippov
Coronal mass ejections (CMEs) are closely related to eruptive filaments and usually are the continuation of the same eruptive process into the upper corona. There are failed filame…
Interaction of Two Filament Channels of Different Chiralities
Navin Chandra Joshi, Boris Filippov, Brigitte Schmieder +3
We present observations of interactions between the two filament channels of different chiralities and associated dynamics that occurred during 2014 April 18 -- 20. While two flux…
Filament Shape Versus Coronal Potential Magnetic Field Structure
Boris Filippov
Solar filament shape in projection on disc depends on the structure of the coronal magnetic field. We calculate the position of polarity inversion lines (PILs) of coronal potential…
Covert connection of filaments
Boris Filippov
We analyse the relationship between two near filaments, which do not show any connection in H-alpha images but reveal close magnetic connectivity during filament activations in Ext…
Solar Magnetic Flux Ropes
Boris Filippov, Olesya Martsenyuk, Abhishek K. Srivastava +1
The most probable initial magnetic configuration of a CME is a flux rope consisting of twisted field lines which fill the whole volume of a dark coronal cavity. The flux ropes can…
A Challenging Solar Eruptive Event of 18 November 2003 and the Causes of the 20 November Geomagnetic Superstorm. IV. Unusual Magnetic Cloud and Overall Scenario
V. V. Grechnev, A. M. Uralov, I. M. Chertok +4
The geomagnetic superstorm of 20 November 2003 with Dst = -422 nT, one of the most intense in history, is not well understood. The superstorm was caused by a moderate solar eruptiv…
A Challenging Solar Eruptive Event of 18 November 2003 and the Causes of the 20 November Geomagnetic Superstorm. III. Catastrophe of the Eruptive Filament at a Magnetic Null Point and Formation of an Opposite-Handedness CME
A. M. Uralov, V. V. Grechnev, G. V. Rudenko +4
Our analysis in Papers I and II (Grechnev et al., 2014, Solar Phys. 289, 289 and 1279) of the 18 November 2003 solar event responsible for the 20 November geomagnetic superstorm ha…
Filament eruption with apparent reshuffle of endpoints
Boris Filippov
Filament eruption on 30 April - 1 May 2010, which shows the reconnection of one filament leg with a region far away from its initial position, is analyzed. Observations from three…
A Challenging Solar Eruptive Event of 18 November 2003 and the Causes of the 20 November Geomagnetic Superstorm. II. CMEs, Shock Waves, and Drifting Radio Bursts
V. V. Grechnev, A. M. Uralov, I. M. Chertok +7
We continue our study (Grechnev et al. (2013), doi:10.1007/s11207-013-0316-6; Paper I) on the 18 November 2003 geoffective event. To understand possible impact on geospace of coron…
Filament eruption on 2010 October 21 from three viewpoints
Boris Filippov
A filament eruption on 2010 October 21 observed from three different viewpoints by the Solar Terrestrial Relations Observatory (STEREO) and the Solar Dynamic Observatory (SDO) is a…
Study of Failed CME Core Associated with Asymmetric Filament Eruption
N. C. Joshi, A. K. Srivastava, B. Filippov +3
We present the multi-wavelength observations of asymmetric filament eruption, associated CME and coronal downflows on 2012 June 17-18 during 20:00-05:00 UT. We use SDO/AIA, STEREO-…
A Challenging Solar Eruptive Event of 18 November 2003 and the Causes of the 20 November Geomagnetic Superstorm. I. Unusual History of an Eruptive Filament
V. V. Grechnev, A. M. Uralov, V. A. Slemzin +4
This is the first of four companion papers, which analyze a complex eruptive event of 18 November 2003 in AR 10501 and the causes of the largest Solar Cycle 23 geomagnetic storm on…
Electric Current Equilibrium in the Corona
Boris Filippov
A hyperbolic flux-tube configuration containing a null point below the flux rope is considered as a pre-eruptive state of coronal mass ejections that start simultaneously with flar…
Formation of a White-Light Jet within a Quadrupolar Magnetic Configuration
Boris Filippov Serge Koutchmy Ehsan Tavabi
We analyze multi-wavelength and multi-viewpoint observations of a large-scale event viewed on 7 April 2011 originating from an active region complex. The activity leads to a white-…
Crossing Filaments
Boris Filippov, A. K. Srivastava
Solar filaments show the position of large scale polarity inversion lines and are used for the reconstruction of large-scale solar magnetic field structure on the basis of Hα synop…