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The magnetic field topology associated with two M flares
Mandrini, C. H.; Démoulin, P.; Luoni, M. L. +1 more
On 27 October, 2003, two GOES M-class flares occurred in an interval of 3 h in active region NOAA 10486. The two flares were confined and their associated brightenings appeared at the same location, displaying a very similar shape both at the chromospheric and coronal levels. We focus on the analysis of magnetic field (SOHO/MDI), chromospheric (HA…
GIADA: The Grain Impact Analyser and Dust Accumulator for the Rosetta space mission
Lopez Moreno, J. J.; Rodriguez, J.; Colangeli, L. +13 more
The ESA ROSETTA mission will perform a rendezvous with comet 67P/Churyumov-Gerasimenko and will follow and study it from about 3.25 AU to perihelion at 1.34 AU and, during the foreseen extended mission, up to 2 AU post-perihelion, in order to observe for the first time the onset of activity of a comet and to follow its evolution. The GIADA (Grain …
Reconstruction of solar irradiance using the Group sunspot number
Solanki, S. K.; Krivova, N. A.; Balmaceda, L.
We present a reconstruction of total solar irradiance since 1610 to the present based on variations of the surface distribution of the solar magnetic field. The latter is calculated from the historical record of the Group sunspot number using a simple but consistent physical model. Our model successfully reproduces three independent data sets: tot…
How to improve the maps of magnetic helicity injection in active regions?
Démoulin, Pascal; Pariat, Etienne; Nindos, Alexander
Magnetic helicity, a topological quantity which measures the twist, the writhe and the shear of a magnetic field, has recently appeared as a key quantity to understand some mechanisms of the solar activity such as Coronal Mass Ejections and flare onset. It is thus becoming of major importance to be able to compute magnetic helicity in active regio…
Emission heights of coronal bright points on Fe XII radiance map
Tu, C. -Y.; Marsch, E.; Tian, H. +1 more
The study of coronal bright points (BPs) is important for understanding coronal heating and the origin of the solar wind. Previous studies indicated that coronal BPs have a highly significant tendency to coincide with magnetic neutral lines in the photosphere. Here we further studied the emission heights of the BPs above the photosphere in the bip…
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…