Search Publications
Ion Charge States in a Time-Dependent Wave-Turbulence-Driven Model of the Solar Wind
Raymond, John; Velli, Marco; Downs, Cooper +4 more
Ion fractional charge states, measured in situ in the heliosphere, depend on the properties of the plasma in the inner corona. As the ions travel outward in the solar wind and the electron density drops, the charge states remain essentially unaltered or "frozen in". Thus they can provide a powerful constraint on heating models of the corona and ac…
On the Relation Between Transition Region Network Jets and Coronal Plumes
Fu, Hui; Li, Bo; Xia, Lidong +5 more
Both coronal plumes and network jets are rooted in network lanes. The relationship between the two, however, has yet to be addressed. For this purpose, we perform an observational analysis using images acquired on 2015 December 4 with the Atmospheric Imaging Assembly (AIA) 171 Å passband to follow the evolution of coronal plumes, the observations …
Solar Flare Forecasting from Magnetic Feature Properties Generated by the Solar Monitor Active Region Tracker
Bloomfield, D. Shaun; Domijan, Katarina; Pitié, François
We study the predictive capabilities of magnetic-feature properties (MF) generated by the Solar Monitor Active Region Tracker (SMART: Higgins et al. in Adv. Space Res.47, 2105, 2011) for solar-flare forecasting from two datasets: the full dataset of SMART detections from 1996 to 2010 which has been previously studied by Ahmed et al. (Solar Phys.28…
Development of a Fast CME and Properties of a Related Interplanetary Transient
Grechnev, V. V.; Kochanov, A. A.; Kiselev, V. I. +5 more
We study the development of a coronal mass ejection (CME) caused by a prominence eruption on 24 February 2011 and properties of a related interplanetary CME (ICME). The prominence destabilized, accelerated, and produced an M3.5 flare, a fast CME, and a shock wave. The eruption at the east limb was observed in quadrature by the Atmospheric Imaging …
On the Origin of Ortho-Gardenhose Heliospheric Flux
Lockwood, Mike; Owens, Mathew J.; Macneil, Allan
Parker-spiral theory predicts that the heliospheric magnetic field (HMF) will have components of opposite polarity radially toward the Sun and tangentially antiparallel to the solar rotation direction (i.e., in Geocentric Solar Ecliptic (GSE) coordinates, with BX/BY<0 ). This theory explains the average orientation of the …
Coronal Imaging with the Solar UltraViolet Imager
Seaton, Daniel B.; Tadikonda, Sivakumara K.; Krimchansky, Alexander +3 more
We investigate the coronal imaging capabilities of the Solar UltraViolet Imager (SUVI) on board the Geostationary Operational Environmental Satellite-R series spacecraft. Nominally Sun-pointed, SUVI provides solar images in six extreme ultraviolet (EUV) wavelengths. On-orbit data indicated that SUVI had sufficient dynamic range and sensitivity to …
Modeling of the Sunspot-Associated Microwave Emission Using a New Method of DEM Inversion
Patsourakos, S.; Alissandrakis, C. E.; Bogod, V. M. +2 more
We develope a method to compute the temperature and density structure along the line of sight by inversion of the differential emission measure (DEM), under the assumptions of stratification and hydrostatic equilibrium. We apply this method to the DEM obtained from the Atmospheric Imaging Assembly (AIA) observations and use the results, together w…
Kinematics and Energetics of the EUV Waves on 11 April 2013
Srivastava, A. K.; Chen, P. F.; Uddin, Wahab +3 more
In this study, we present the observations of extreme-ultraviolet (EUV) waves associated with an M6.5 flare on 2013 April 11. The event was observed by Solar Dynamics Observatory (SDO) in different EUV channels. The flare was also associated with a halo CME and type II radio bursts. We observed both fast and slow components of the EUV wave. The sp…
Properties of High-Energy Solar Particle Events Associated with Solar Radio Emissions
Valtonen, Eino; Pohjolainen, Silja; Ameri, Dheyaa
We have analysed 58 high-energy proton events and 36 temporally related near-relativistic electron events from the years 1997 - 2015 for which the velocity dispersion analysis of the first-arriving particles gave the apparent path lengths between 1 and 3 AU. We investigated the dependence of the characteristics of the proton events on the associat…
Twin CME Launched by a Blowout Jet Originated from the Eruption of a Quiet-Sun Mini-filament
Srivastava, A. K.; Dwivedi, B. N.; Rao, Y. K. +1 more
We study a quiet-Sun blowout jet which was observed on 2014 May 16 by the instruments on board the Solar Dynamics Observatory (SDO). We find the twin CME as jet-like and bubble-like CMEs simultaneously as observed by LASCO C2 on board the Solar and Heliospheric Observatory (SoHO), and the Solar Terrestrial Relation Observatory (STEREO_A and STEREO…