Search Publications
Detection of Coronal Mass Ejections Using Multiple Features and Space-Time Continuity
Zhang, Ling; Yin, Jian-qin; Lin, Jia-ben +2 more
Coronal Mass Ejections (CMEs) release tremendous amounts of energy in the solar system, which has an impact on satellites, power facilities and wireless transmission. To effectively detect a CME in Large Angle Spectrometric Coronagraph (LASCO) C2 images, we propose a novel algorithm to locate the suspected CME regions, using the Extreme Learning M…
Development and Parameters of a Non-Self-Similar CME Caused by the Eruption of a Quiescent Prominence
Grechnev, V. V.; Kuzmenko, I. V.
The eruption of a large quiescent prominence on 17 August 2013 and an associated coronal mass ejection (CME) were observed from different vantage points by the Solar Dynamics Observatory (SDO), the Solar-Terrestrial Relations Observatory (STEREO), and the Solar and Heliospheric Observatory (SOHO). Screening of the quiet Sun by the prominence produ…
Anomalous Surge of the White-Light Corona at the Onset of the Declining Phase of Solar Cycle 24
Lamy, P.; Vibert, D.; Wojak, J. +1 more
In late 2014, when the current Solar Cycle 24 entered its declining phase, the white-light corona as observed by the LASCO-C2 coronagraph underwent an unexpected surge that increased its global radiance by 60%, reaching a peak value comparable to the peak values of the more active Solar Cycle 23. A comparison of the temporal variation of the white…
Investigation of the Geoeffectiveness of Disk-Centre Full-Halo Coronal Mass Ejections
Valtonen, Eino; Ameri, Dheyaa
We studied the occurrence and characteristics of geomagnetic storms associated with disk-centre full-halo coronal mass ejections (DC-FH-CMEs). Such coronal mass ejections (CMEs) can be considered as the most plausible cause of geomagnetic storms. We selected front-side full-halo coronal mass ejections detected by the Large Angle and Spectrometric …
SPIN: An Inversion Code for the Photospheric Spectral Line
Mathew, Shibu K.; Yadav, Rahul; Tiwary, Alok Ranjan
Inversion codes are the most useful tools to infer the physical properties of the solar atmosphere from the interpretation of Stokes profiles. In this paper, we present the details of a new Stokes Profile INversion code (SPIN) developed specifically to invert the spectro-polarimetric data of the Multi-Application Solar Telescope (MAST) at Udaipur …
Origin of Radio Enhancements in Type II Bursts in the Outer Corona
Valtonen, Eino; Pohjolainen, Silja; Al-Hamadani, Firas
We study interplanetary (IP) solar radio type II bursts from 2011 - 2014 in order to determine the cause of the intense enhancements in their radio emission. Type II bursts are known to be due to propagating shocks that are often associated with fast halo-type coronal mass ejections (CMEs). We analysed the radio spectral data and the white-light c…
Initial In-flight Results: The Total Solar Irradiance Monitor on the FY-3C Satellite, an Instrument with a Pointing System
Wang, Hongrui; Li, Huiduan; Qi, Jin +1 more
The total solar irradiance (TSI) has been recorded daily since October 2013 by the Total Solar Irradiance Monitor (TSIM) onboard the FY-3C satellite, which is mainly designed for Earth observation. The TSIM has a pointing system to perform solar tracking using a sun sensor. The TSI is measured by two electrical substitution radiometers with tracea…
Propagation of Coronal Mass Ejections Observed During the Rising Phase of Solar Cycle 24
Shanmugaraju, A.; Syed Ibrahim, M.; Manoharan, P. K.
In this study, we investigate the interplanetary consequences and travel time details of 58 coronal mass ejections (CMEs) in the Sun-Earth distance. The CMEs considered are halo and partial halo events of width >120 °. These CMEs occurred during 2009 - 2013, in the ascending phase of the Solar Cycle 24. Moreover, they are Earth-directed events …
Heights of Coronal Mass Ejections and Shocks Inferred from Metric and DH Type II Radio Bursts
Shanmugaraju, A.; Suresh, K.; Lee, Jae-Ok +2 more
A set of 27 continuous events that showed extension of metric Type-II radio bursts (m-Type IIs) into the deca-hectometric (DH) domain is considered. The coronal mass ejections (CMEs) associated with this type of continuous event supply more energy to produce space-weather effects than the CMEs that produce Type-II bursts in any one region. Since t…
CME Velocity and Acceleration Error Estimates Using the Bootstrap Method
Gopalswamy, Nat; Yashiro, Seiji; Michalek, Grzegorz
The bootstrap method is used to determine errors of basic attributes of coronal mass ejections (CMEs) visually identified in images obtained by the Solar and Heliospheric Observatory (SOHO) mission's Large Angle and Spectrometric Coronagraph (LASCO) instruments. The basic parameters of CMEs are stored, among others, in a database known as the SOHO…