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Diffuse galactic sub-MeV γ -ray excess from high-energy electrons
Strong, A. W.; Schlickeiser, R.; Schröder, R.
Recent INTEGRAL observations have confirmed the existence of diffuse sub-MeV radiation from the inner Galaxy. We propose a new explanation for the origin of this diffuse component in terms of electrostatic bremsstrahlung radiation from high-energy electrons. This electrostatic bremsstrahlung interpretation requires a very flat power law energy spe…
Low-Frequency Plasma Waves in the Outer Polar CUSP: A Review of Observations from Prognoz 8, Interball 1, Magion 4, and Cluster
Sauvaud, J. -A.; Santolik, O.; Parrot, M. +7 more
This paper presents a review of the most interesting observations of low-frequency plasma waves together with plasma particles which were made by the Interball 1, Magion 4 and Prognoz 8 satellites in the outer polar cusp. Accelerated plasma particles, hot electron populations and very strong wave activity, particularly at low frequencies, are obse…
Spatial and Temporal Cusp Structures Observed by Multiple Spacecraft and Ground Based Observations
Yeoman, T. K.; Fuselier, S. A.; Reme, H. +6 more
Downward precipitating ions in the cusp regularly exhibit sudden changes in ion energy distributions, forming distinctive structures that can be used to study the temporal/spatial nature of reconnection at the magnetopause. When observed simultaneously with the Polar, FAST, and Interball satellites, such cusp structures revealed remarkably similar…
Detectability of Gamma-Ray Burst Iron Lines by Swift, Chandra, and XMM-Newton
Kallman, T. R.; Mészáros, P.; Gou, L. J.
The rapid acquisition of positions by the upcoming Swift satellite will allow monitoring for X-ray lines in gamma-ray burst (GRB) afterglows at much earlier epochs than was previously feasible. We calculate the possible significance levels of iron-line detections as a function of source redshift and observing time after the trigger for the Swift X…
Coronal mass ejection of 4 April 2000 and associated space weather effects
Jadav, R. M.; Iyer, K. N.; Joshi, H. P. +1 more
The effects of a Halo Coronal Mass Ejection (CME) erupted on 4 April 2000 are studied and reported here. The effect of such CME on the interplanetary medium (IPM) is sensed by the Interplanetary Scintillation (IPS) recorded at Rajkot. The Solar Observations of this CME and associated events, like Solar Energetic Particles (SEP) and flare, are pres…
HT Camelopardalis: the simplest intermediate polar spin pulse
Hellier, Coel; Evans, P. A.
The intermediate polar (IP) HT Cam is unusual in that it shows no evidence for dense absorption in its spectrum. We analyse an XMM-Newton observation of this star, which confirms the absence of absorption and shows that the X-ray spin pulse is energy independent. The modulation arises solely from occultation effects and can be reproduced by a simp…
Location and parameters of a microwave millisecond spike event
Nakajima, Hiroshi; Huang, Guangli
A typical microwave millisecond spike event on November 2, 1997 was observed by the radio spectrograph of National Astronomical Observatories (NAOs) at 2.6–3.8 GHz with high time and frequency resolution. This event was also recorded by Nobeyama Radio Polarimeters (NoRP) at 1–35 GHz and Radio Heliograph (NoRH) at 17 GHz. The source at 17 GHz is lo…
Time variations of cosmic ray electrons and nuclei between 1978 and 2004: Evidence for charge-dependent modulation organized by changes in solar magnetic polarity and current sheet tilt
Heber, B.; Webber, W. R.; Lockwood, J. A.
We have examined the 52-day average intensities of 1.2-GV electrons and positively charged nuclei of the same rigidity during the time period from 1978 to 2004. This time period covers a complete 22-year solar cycle plus data from 2000 to 2004 that can be used to examine the repetitive nature of the variations. The 11-year solar modulation changes…
Large-scale photospheric dynamics below coronal holes
Meunier, N.
A large data set of MDI magnetograms is studied to analyze the global dynamics of magnetic structures from network to active regions inside and outside coronal holes. We find a weaker meridional circulation at almost all latitudes, as well as a more differential rotation of the photospheric magnetic structures below high-latitude coronal holes. St…
GRB 050223: a faint gamma-ray burst discovered by Swift
Campana, S.; Tagliaferri, G.; Cusumano, G. +16 more
GRB 050223 was discovered by the Swift Gamma-Ray Burst Explorer on 2005 February 23 and was the first gamma-ray burst (GRB) to be observed by both Swift and XMM-Newton. At the time of writing (2005 May), it has one of the faintest GRB afterglows ever observed. The spacecraft could not slew immediately to the burst, so the first X-ray and optical o…