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A solar eruption triggered by merge interactions of different helicity loops
Shen, F.; Song, W.; Feng, X.
Aims: We investigate the magnetic evolution of a flare/CME source region to determine the trigger of the flare and the EUV brightening event. Also, we discuss the role of the current helicity (h_c) in solar activity.
Methods: We use the long duration sequences of SOHO/MDI magnetograms and TRACE 195 Å images for a super active region (AR), NOAA…
VERA Observations of SiO Masers in the Symbiotic Star R Aquarii
Hirota, Tomoya; Kurayama, Tomoharu; Honma, Mareki +28 more
We present phase-referenced maps of the SiO maser transitions v = 1 J = 1--0 and v = 2 J = 1--0 from the symbiotic stellar system R Aquarii, which hosts an evolved AGB star plus a hot companion. Observations were performed at two epochs: 2004.98 and 2005.98. Accurate absolute coordinates and proper motions of the emission centroid were obtained; t…
Introduction to the special section on Venus Express: Results of the Nominal Mission
Taylor, F. W.; Titov, D. V.; Svedhem, H.
Abstract Available from http://www.agu.org
Analysis of Two Coronal Loops with Combined TRACE and SOHO/CDS Data
Martens, P. C. H.; Cirtain, J. W.; Scott, J. T.
We use an innovative research technique to analyze combined images from the Coronal Diagnostic Spectrometer (CDS) on the Solar and Heliospheric Observatory (SOHO) and the Transition Region and Coronal Explorer (TRACE). We produce a high spatial and temporal resolution simulated CDS raster or "composite" map from TRACE data and use this composite m…
Coronal Mass Ejections, Magnetic Fields, and the Green Corona in Cycle 23
Rušin, V.; Minarovjech, M.; Saniga, M.
We study a time - latitudinal distribution of CMEs observed by the SOHO spacecraft, their projected speeds and associated magnetic fields, as well as the north - south (N - S) asymmetry of solar surface magnetic fields, and the coronal green line intensities. We have found that (a) there exists an intricate relation between the average projected v…
Near-Earth bursty bulk flows and AE index
Dunlop, M. W.; Baumjohann, W.; Carr, C. +5 more
With the 4-s resolution data of the magnetometer and the ion plasma analyzer on TC-1 from June to November of each year during the period of 2004-2006, we statistically analyzed the occurrence rate of both convective and field-aligned bursty flows (FABFs). A near-Earth bursty bulk flow (NEBBF) occurred during both the quiet time and substorm proce…
How Do f-Mode Frequencies Change with Solar Radius?
Antia, H. M.; Chatterjee, Piyali
We test the relation between relative f-mode frequency variation (δ ν/ν) and Lagrangian perturbation in the solar radius (δ r/r) obtained by Dziembowski and Goode using several pairs of solar models and show that it does not hold true for any of the model pairs we have used. We attempt to derive a better approximation for the kernel linking the re…
Stellar populations in the Local Group starburst galaxy IC10
Giuffrida, G.; Pulone, L.; Sanna, N. +10 more
We present preliminary results of a photometric investigation on IC10 using F555W and F814W data collected with WFPC2@HST covering two different regions. We provide a new estimate of both distance and reddening by adopting the Tip of the Red Giant Branch (TRGB). We find that the RGB stars in the two regions are located at the same distance, but pr…
The FR II Broad-Line Seyfert 1 Galaxy: PKS J1037-2705
Clarke, Tracy E.; Punsly, Brian; Tingay, Steven +3 more
In this article we demonstrate that PKS J1037-2705 has a weak accretion flow luminosity, well below the Seyfert 1/QSO dividing line, weak broad emission lines (BELs), and moderately powerful FR II extended radio emission. It is one of the few documented examples of a broad-line object in which the time-averaged jet kinetic luminosity, \overline{Q}…
From Maxwell's theory of Saturn's rings to the negative mass instability
Fedele, Renato