Search Publications
The dynamic 3D heliosphere: Implications for and new sources of its energetic particles
McComas, D. J.; Schwadron, N. A.
In recent years, two important aspects of heliospheric physics have emerged: (1) the intrinsic dynamism of the Sun's open magnetic flux and its vast importance for energetic particle propagation and acceleration; and (2) the importance of heliospheric grain populations for the production of energetic particles and anomalous cosmic rays. These new …
The spatial correlation of the non-thermal velocities for O IV and Si IV in the lower transition region
Doschek, G. A.; Mariska, J. T.; Akiyama, S.
We analyze the spatial relationship between non-thermal velocities derived from spectral lines of O IV. λ1401.16 (1.6×105 K) and Si IV λ1402.77 (6.3x10 4 K) in the solar lower transition region. The lines formed at different temperatures are observed simultaneously and at the same locations on the solar disk by the Solar Ultraviolet Mea…
Magnetic cloud and magnetosphere — Ionosphere response to the 6 November 1997 CME
Bochev, A. Z.; -Dimitrova, I. I. A.
In the present work we analyse the magnetic cloud (MC) at 1 AU on 9 November 1997. The appearance of a hotter and dense part (dense filament), with radial extent 10 6 km, immediately behind the frontal part of the MC, is a distinctive feature of the event. The INTERBALL - Aurora] Probe had a chance to observe field-aligned currents in t…
Propagation of CMEs in the interplanetary medium: Numerical and analytical results
Raga, A. C.; Lara, A.; Cantó, J. +2 more
We study the propagation of coronal mass ejections (CMES) from near the Sun to 1 AU by comparing results from two different models: a 1-D, hydrodynamic, single-fluid, numerical model (González-Esparza et al., 2003a) and an analytical model to study the dynamical evolution of supersonic velocity's fluctuations at the base of the solar wind applied …
Coronal mass ejection speeds measured in the solar corona using LASCO C2 and C3 images
Stenborg, G.; Gonzalez, W. D.; Dal Lago, A. +1 more
In this work we present height-time diagrams of 2 halo coronal mass ejections, observed on September 28th, 1997 and June 29th, 1999. The CMEs were observed by the Large Angle and Spectroscopic Coronagraph (LASCO), which observes the solar corona from 2 to 32 solar radii. To obtain these diagrams we divide the LASCO images of a given sequence in an…
Ultraviolet light curves of eclipsing binary stars. I. The catalogue of IUE data
Połubek, Grzegorz
The catalogue contains eclipsing and ellipsoidal variable stars observed by International Ultraviolet Explorer satellite (IUE). As examples we discuss IUE data for Algol (β Persei) and MR Cygni.
Simultaneous observations of radio wave frequency and intensity fluctuations for estimates of solar wind speed
Bird, M. K.; Efimov, A. I.; Chashei, I. V. +1 more
A new method is developed for solar wind speed measurements based on simultaneous observations of radio wave temporal intensity and frequency fluctuations. An estimate of the solar wind convection velocity is obtained from a combination of the frequency (Doppler) fluctuation spectral power at low fluctuating frequency and the power in the flat par…
The mean stellar parameters from IUE and hipparcos data
Niemczura, E.; Cugier, H.; Daszyńska, J.
Fine structure of the polar cusp as deduced from the plasma wave and plasma measurements
Sauvaud, J. -A.; Santolik, O.; Parrot, M. +7 more
Plasma waves are one of the most significant features of plasma. They are a very sensitive indicator of the boundaries and inner structure of different regions in space plasmas. The data gathered onboard Interball 1 and Magion 4 in the polar cusp indicate that plasma wave intensity changes very rapidly with a characteristic period of the order of …
Modulation effects of a changing solar wind speed on low-energy electrons
Ferreira, S. E. S.; Potgieter, M. S.; Moeketsi, D. M.
The heliospheric modulation of galactic and jovian electrons is studied using a fully three-dimensional, steady-state model based on Parker's transport equation including the jovian electron source. The model is used to study the transport of 7 MeV joviair and galactic electrons in the heliosphere by changing the solar wind speed profile from sola…