Search Publications
Solar terrestrial effects of two distinct types
Kane, R. P.
The occurrence frequencies or fluxes of most of the solar phenomena show a 11-year cycle like that of sunspots. However, the average characteristics of these phenomena may not show a 11-year cycle. Among the terrestrial parameters, some related directly to the occurrence frequencies of solar phenomena (for example, ionospheric number densities rel…
The change of solar shape in time and depth. Some consequences for space climate
Kosovichev, A. G.; Lefebvre, S.; Rozelot, J. P.
During the last five years, studies of the Sun and Sun-Earth relationships have dramatically changed our view on solar terrestrial physics. We will here focus on new views on the solar interior. The internal non-homogeneous mass distribution and non-uniform angular velocity (function of the radial distance to the center and of the latitude) yield …
Modeling the (upper) solar atmosphere including the magnetic field
Peter, H.
The atmosphere of the Sun is highly structured and dynamic in nature. From the photosphere and chromosphere into the transition region and the corona plasma- β changes from above to below one, i.e., while in the lower atmosphere the energy density of the plasma dominates, in the upper atmosphere the magnetic field plays the governing role - one mi…
Galaxy colours in the AKARI deep SEP survey
Nakagawa, Takao; Shirahata, Mai; Jeong, Woong-Seob +7 more
We investigate the segregation of the extragalactic population via colour criteria to produce an efficient and inexpensive methodology to select specific source populations as a function of far-infrared flux. Combining galaxy evolution scenarios and a detailed spectral library of galaxies, we produce simulated catalogues incorporating segregation …
Sequential chromospheric brightenings: The case for chromospheric evaporation
Pevtsov, Alexei A.; Balasubramaniam, K. S.; Hock, Rachel A.
Sequential chromospheric brightenings (SCBs [Balasubramaniam, K.S., Pevtsov, A.A., Neidig, D.F., Cliver, E.W., Thompson, B.J., Young, C.A., Martin, S.F., & Kiplinger, A., 630, 1160, 2005.]) are observed in conjunction with some strong solar flares, prominence eruptions, and coronal mass ejections (CMEs). SCBs are seen as wave-like trains of in…
Highly significant detection of solar neutrons on 2005 September 7
Tanaka, Y. T.; Yoshikawa, I.; Mukai, T. +21 more
We have successfully detected solar neutrons at ground level in association with the X17.0 solar flare that occurred on 2005 September 7. Observations were made with the solar neutron telescopes and neutron monitors located in Bolivia and Mexico. In this flare, large fluxes of hard X-rays and γ-rays were observed by the GEOTAIL and the INTEGRAL sa…
Suzaku observations of cyclotron resonances in binary X-ray pulsars
Yonetoku, D.; Mihara, T.; Takahashi, H. +16 more
Since the typical magnetic field strengths of neutron stars reach 10 12 Gauss, the cyclotron resonance produced by a transition between Landau levels appears in the X-ray band. Systematic measurements of cyclotron absorption features in bright sources have been carried out extensively with Ginga, RXTE, BeppoSAX, and INTEGRAL. The cyclot…
Understanding the origin of the solar cyclic activity for an improved earth climate prediction
Turck-Chièze, Sylvaine; Lambert, Pascal
This review is dedicated to the processes which could explain the origin of the great extrema of the solar activity. We would like to reach a more suitable estimate and prediction of the temporal solar variability and its real impact on the Earth climatic models. The development of this new field is stimulated by the SoHO helioseismic measurements…
Detection of Martian dust clouds by SPICAM UV nadir measurements during the October 2005 regional dust storm
Montmessin, F.; Bertaux, J. L.; Fussen, D. +5 more
The SPICAM UV spectrometer onboard Mars Express observed two regional dust storms: on October 24, 2005, near Argyre Planitia and on July 9, 2005, in Hellas Planitia. The measurements were performed in nadir mode. The spectral domain 210-310 nm is considered. A comparison with a prior orbit which passed above almost the same path 6 days before the …
The CME-productivity associated with flares from two active regions
Gopalswamy, N.; Yashiro, S.; Akiyama, S.
We report on two flare-productive adjacent active regions (ARs), with different levels of coronal mass ejection (CME) association. AR 10039 and AR 10044 produced strong X-ray flares during their disk passages. We examined the CME association rate of X-ray flares and found it to be different between the two ARs. AR 10039 was CME-rich with 72% assoc…