Search Publications
A New Type of Jet in a Polar Limb of the Solar Coronal Hole
Moon, Yong-Jae; Cho, Kyung-Suk; Kim, Yeon-Han +3 more
A new type of chromospheric jet in a polar limb of a coronal hole is discovered in the Ca II filtergram of the Solar Optical Telescope on board the Hinode. We identify 30 jets in a filtered Ca II movie with a duration of 53 minutes. The average speed at their maximum heights is found to be 132 ± 44 km s-1 ranging from 57 to 264 km s
Study of Interplanetary CMEs/Shocks During Solar Cycle 24 Using Drag-Based Model: The Role of Solar Wind
Shanmugaraju, A.; Vršnak, Bojan; Suresh, K. +2 more
In this paper we analyze a set of 27 fast interplanetary coronal mass ejections (ICMEs) observed during the period January 2010 - December 2013 in Solar Cycle 24. The arrivals of interplanetary shocks and CMEs at 1 AU are found from OMNI spacecraft high resolution data and their travel times are compared with Empirical Shock Arrival (ESA; Gopalswa…
Close up observation and inversion of low-altitude ENA emissions during a substorm event
McKenna-Lawlor, Susan; Lu, Li; Balaz, Jan
During a series of substorm events on November 12 2004, the Neutral Atom Detector Unit (NUADU) flying onboard the TC-2 spacecraft observed, close to perigee, bright low-altitude Energetic Neutral Atom (ENA) emissions from both north and south poles. Through utilizing high temporal and spatial resolution data inversion techniques we present here a …
The Difference Between Isolated Flux Transfer Events and Flux Transfer Event Cascades
Karlsson, T.; Kullen, A.; Thor, S.
This flux transfer event (FTE) study is based on 984 FTEs originally identified by Wang et al. (2005, https://doi:10.1029/2005JA011150) in Cluster data. Due to Cluster's orbit, the FTE list exclusively contains events detected at the high-latitude dayside magnetopause and low-latitude flanks. The focu…
Two Circumstellar Nebulae Discovered with the Wide-field Infrared Survey Explore and Their Massive Central Stars
Grebel, Eva K.; Castro, Norberto; Gvaramadze, Vasilii V. +1 more
We report the discovery of two mid-infrared nebulae in the northern hemisphere with the Wide-field Infrared Survey Explorer and the results of optical spectroscopy of their central stars, BD+60° 2668 (composed of two components, separated from each other by ≈3 arcsec) and ALS 19653, with the Calar Alto 3.5 m telescope and the Southern African Larg…
A Note on Capon's Minimum Variance Projection for Multi-Spacecraft Data Analysis
Narita, Yasuhito
Capon's minimum variance projection for the multi-point measurements is revisited using the method of likelihood function to derive the minimum variance projection and a simplified error estimate analytically. Theoretical construction of the minimum variance projection assumes a Gaussian form of the likelihood function and also regards the data co…
Small-scale dipolarization fronts in the Earth's magnetotail
Zhou, Meng; Huang, Jing; Liu, Jiang +3 more
Herschel water maps towards the vicinity of the black hole Sgr A*
Martín-Pintado, J.; Harris, A. I.; van der Werf, P. +8 more
Aims: We study the spatial distribution and kinematics of water emission in a 8 × 8 pc2 region of the Galactic center (GC) that covers the main molecular features around the supermassive black hole Sagittarius A* (Sgr A*). We also analyze the water excitation to derive the physical conditions and water abundan…
Massive Young Stellar Objects and Outflow in the Infrared Dark Cloud G79.3+0.3
Zhang, Qizhou; Hora, Joseph L.; Laws, Anna S. E.
G79.3+0.3 is an infrared dark cloud in the Cygnus-X complex that is home to massive deeply embedded young stellar objects (YSOs). We have produced a Submillimeter Array (SMA) 1.3 mm continuum image and 12CO line maps of the eastern section of G79.3+0.3 in which we detect five separate YSOs. We have estimated physical parameters for thes…
INTEGRAL results on gamma-ray bursts and polarization of hard X-ray sources
Mereghetti, Sandro; Götz, Diego; Laurent, Philippe +9 more
In this paper we first review the results obtained by the INTEGRAL mission in the domain of Gamma-Ray Bursts (GRBs), thanks to the INTEGRAL Burst Alert System, which is able to deliver near real-time alerts for GRBs detected within the IBIS field of view. More than 120 GRBs have been detected to date and we summarize their properties here. In the …