Search Publications
Jovian periodicities (∼10 h, ∼40 min) on Ulysses’ Distant Jupiter Encounter observations around the Halloween CIR events
Sarris, E. T.; Anagnostopoulos, G. C.; Louri, I. +1 more
We analyzed data from four different instruments (HI-SCALE, URAP, SWOOPS, VHM/FGM) onboard Ulysses spacecraft (s/c) and we searched for possible evidence of Jovian emissions when the s/c approached Jupiter during the times of Halloween events (closest time approach/position to Jupiter: February 5, 2004/ R = 1683 R J, θ = ∼49°). In parti…
Solar proton enhancements in different energy channels and coronal mass ejections during the last solar cycle
Mavromichalaki, H.; Belov, A.; Gerontidou, M. +1 more
The main properties of 11622 coronal mass ejections (CMEs) observed by the Solar and Heliospheric Observatory (SOHO) mission’s Large Angle and Spectrometric Coronagraph (LASCO-C2) from January 1996 through December 2006 are considered. Moreover, the extended database of solar proton enhancements (SPEs) with proton flux >0.1 pfu at energy >10…
Interpretation of the SOHO/UVCS observations of two CME-driven shocks
Mancuso, Salvatore; Bemporad, Alessandro
We report on the analysis of two fast CME-driven shocks observed with the UltraViolet Coronagraph Spectrometer (UVCS) on board the Solar and Heliospheric Observatory (SOHO). The first event, detected on 2002 March 22 at 4.1 R⊙ with the UVCS slit placed in correspondence with the flank of the expanding CME surface, represents the highest…
Broadband electrostatic noise and low-frequency waves in the Earth’s magnetosphere
Lakhina, G. S.; Singh, S. V.; Reddy, R. V.
Broadband electrostatic noise (BEN) is commonly observed in different regions of the Earth's magnetosphere, eg., auroral region, plasma sheet boundary layer, etc. The frequency of these BENs lies in the range from lower hybrid to the local electron plasma frequency and sometimes even higher. Spacecraft observations suggest that the high and low-fr…
Evidence of the radio-quiet hard X-ray precursor of the 13 December 2006 solar flare
Zimovets, I. V.; Struminsky, A. B.; Gros, M.
We report multi-wavelength investigation of the pre-impulsive phase of the 13 December 2006 X-class solar flare. We use hard X-ray data from the anticoincidence system of spectrometer onboard INTEGRAL (ACS) jointly with soft X-ray data from the GOES-12 and Hinode satellites. Radio data are from Nobeyama and Learmonth solar observatories and from t…
On-disk signatures of eruptive activity from the Hinode mission
Harra, Louise K.
On-disk signatures of eruptive activity have been investigated for many years. These include filament eruptions, flares, coronal waves and dimmings. The Hinode mission is providing a new perspective on eruptive activity on the Sun and its linkage to the Earth. Despite being in a period of solar minimum since the launch of Hinode in September 2006,…
HF wave activity in the low and middle-altitude polar cusp
Pitout, F.; Reme, H.; Trotignon, J. -G. +3 more
We reported the results of our investigations of wave activity in high-frequency range performed on board CLUSTER spacecraft in the middle-altitude cusp region, around 5 RE during August and September 2002. Our analysis was mainly based on the registration gathered by the WHISPER instrument (Waves of HIgh frequency and Sounder for Probi…
Experimental data and analysis of the October 2003 Forbush decrease
D'Andrea, C.; Poirier, J.; Balsara, D. S.
On October 28, 2003 an Earthward-directed coronal mass ejection (CME) was observed from SOHO/LASCO imagery in conjunction with an X17 solar flare. The CME, traveling at nearly 2000 km/s, impacted the Earth on October 29, 2003 causing ground-based particle detectors to register a counting rate drop known as a Forbush decrease. The CME was not only …
Asymmetric precipitation in a coronal loop as explanation of a singular observed spectrum
Mandrini, C. H.; Giménez de Castro, C. G.; Cristiani, G. +2 more
Almost 10 years of solar submillimeter observations have shown new aspects of solar activity, such as the presence of rapid solar spikes associated with the launch of coronal mass ejections and an increasing submillimeter spectral component in flares. We analyse the singular microwave-submillimeter spectrum of an M class solar flare on 20 December…
Plan management system for space science mission systems
Chaizy, P. A.; Dimbylow, T. G.; Hapgood, M. A. +1 more
The number and complexity of systems that control Space Science Missions continues to increase. As a result, it is desirable to improve the efficiency of these systems and, in particular, their performance and their productivity. In this paper, we set out a strategy to achieve this goal. In order to talk about improving the Performance and Product…