Search Publications
Estimation of the Reconnection Electric Field in the 2003 October 29 X10 Flare
Krucker, Säm; Cheng, C. Z.; Yang, Ya-Hui +1 more
The electric field in the reconnecting current sheet of the 2003 October 29 X10 flare is estimated to be a few kV m-1 in this study, based on the rate of change in the photospheric magnetic flux in the newly brightened areas of Transition Region and Coronal Explorer (TRACE) UV ribbons. For comparison, the motion speed of Reuven Ramaty H…
Coronal Transient Events During Two Solar Minima: Their Solar Source Regions and Interplanetary Counterparts
Mandrini, C. H.; Dasso, S.; Cremades, H.
In the frame of two coordinated observational and research efforts, two full solar rotations were investigated in the times of two distinct solar minima. These two campaigns were dubbed Whole Sun Month (WSM; 10 August - 8 September 1996) and Whole Heliosphere Interval (WHI; 20 March - 16 April 2008). The nearly uninterrupted gathering of solar cor…
Quasi-periodic flares in EXO 2030+375 observed with INTEGRAL
Klochkov, D.; Santangelo, A.; Ferrigno, C. +5 more
Context. Episodic flaring activity is a common feature of X-ray pulsars in HMXBs. In some Be/X-ray binaries flares were observed in quiescence or prior to outbursts. EXO 2030+375 is a Be/X-ray binary showing "normal" outbursts almost every ~46 days, near periastron passage of the orbital revolution. Some of these outbursts were occasionally monito…
The Disappearing Solar Filament of 2003 June 11: A Three-body Problem
Panasenco, O.; Balasubramaniam, K. S.; Pevtsov, A. A. +2 more
The eruption of a large quiescent filament on 2003 June 11 was preceded by the birth of a nearby active region—a common scenario. In this case, however, the filament lay near a pre-existing active region and the new active region did not destabilize the filament by direct magnetic connection. Instead it appears to have done so indirectly via magne…
SAID/SAPS-related VLF waves and the outer radiation belt boundary
Mishin, Evgeny; Santolik, Ondrej; Albert, Jay
We explore Cluster and CRRES observations of plasmaspheric broadband hiss-like VLF emissions related with subauroral ion drifts/polarization streams (SAID/SAPS) to numerically simulate losses of energetic outer zone electrons due to wave-particle interactions. These emissions represent a distinctive subset of substorm/storm-related VLF activity in…
Study of inertial kinetic Alfven waves around cusp region
Agarwal, P.; Varma, P.; Tiwari, M. S.
The effect of electron inertia on kinetic Alfven wave has been studied. The expressions for the dispersion relation, growth/damping rate and growth/damping length of the inertial kinetic Alfven wave (IKAW) are derived using the kinetic approach in cusp region. The Vlasov-kinetic theory has been adopted to evaluate the dispersion relation, growth/d…
XMM-Newton first X-ray detection of the low-ionization broad absorption line quasar PG 1700+518
Vignali, C.; Schartel, N.; Ballo, L. +1 more
We report the first high-energy detection of PG 1700+518, a well-known low-ionization broad absorption line quasar (quasi-stellar object, QSO). Due to previous X-ray non-detection, it was classified as soft X-ray weak QSO. We observed PG 1700+518 with XMM-Newton for about 60 ks divided in three exposures. The spectrum below 2 keV is very steep, Γ∼…
The nearby eclipsing stellar system δ Velorum. III. Self-consistent fundamental parameters and distance
Schertl, D.; Kervella, P.; Natta, A. +6 more
Context. The triple stellar system δ Vel (composed of two A-type and one F-type main-sequence stars) is particularly interesting because it contains one of the nearest and brightest eclipsing binaries. It therefore presents a unique opportunity to determine independently the physical properties of the three components of the system, as well as its…
The Suzaku Discovery of A Hard Power-Law Component in the Spectra of Short Bursts from SGR 0501+4516
Enoto, Teruaki; Makishima, Kazuo; Nakagawa, Yujin E.
Using data with the Suzaku XIS and HXD, spectral studies of short bursts from the soft gamma repeater SGR 0501
High-speed flowing plasmas in the Earth's plasma sheet
Parks, George; Fu, SuiYan; Sun, WeiJie +4 more
A research topic of great interest to the space physics community is the observation of plasmas flowing at hundreds of kilometers per second in the Earth's plasma sheet. Although considerable effort has been made to understand the source of fast-flowing plasmas, many questions remain unanswered about the mechanisms that produce high-speed flows an…