Search Publications
Correlation Between CME Occurrence Rate and Current Helicity in the Global Magnetic Field of Solar Cycle 23
Zhang, Mei; Wang, Chuanyu
We investigate the correlation between the occurrence rate of the monthly coronal mass ejection (CME) and the magnitude of the current helicity in global magnetic field on the photosphere of solar cycle 23. We used the technique introduced by Pevtsov and Latushko (Astrophys. J. 528, 999, 2000) to retrieve the vector magnetic field from longitudina…
Solar Wind Interaction with Giant Magnetospheres and Earth's Magnetosphere
Delamere, P. A.
This chapter compares the solar wind interaction with Earth and with the giant magnetospheres and discusses implications for the magnetotail. The term "Dungey cycle" used throughout this chapter refers to the idealized situation where opening dayside reconnection drives large-scale (ideally two cells) ionospheric convection and closing reconnectio…
Black holes in 4 nearby radio galaxies
Cotter, Garret; Readhead, Tony; Durré, Mark +2 more
We study the velocity dispersion profiles of the nuclei of NGC 1326, 2685, 5273 and 5838 in the CO first overtone band. There is evidence for a black hole (BH) in NGC 1326 and 5838. Gas is seen flowing out of the nuclear region of NGC 5273. We put upper limits on the nuclear BHs responsible for its activity and that of NGC 2685.
Modulation of Galactic Cosmic Rays Observed at L1 in Solar Cycle 23
Fludra, A.
We analyze a unique 15 yr record of galactic cosmic-ray (GCR) measurements made by the SOHO Coronal Diagnostic Spectrometer NIS detectors, recording integrated GCR numbers with energies above 1.0 GeV between 1996 July and 2011 June. We are able to closely reproduce the main features of the SOHO/CDS GCR record using the modulation potential calcula…
Development of technique to detect and classify small-scale magnetic flux cancellation and rapid blue-shifted excursions
Liu, Chang; Jing, Ju; Wang, Haimin +5 more
We present a set of tools for detecting small-scale solar magnetic cancellations and the disk counterpart of type II spicules (the so-called Rapid Blueshifted Excursions (RBEs)), using line-of-sight photospheric magnetograms and chromospheric spectroscopic observations, respectively. For tracking magnetic cancellation, we improve the Southwest Aut…
The energy-based scaling of a thin current sheet: Case study
Sasunov, Yu. L.; Khodachenko, M. L.; Alexeev, I. I. +3 more
The influence of average plasma energy on the half thickness ℓ of a thin current sheet (TCS) is investigated for three cases of TCSs crossings. The value of ℓ was estimated from the magnetic field data by means of Cluster observations. The obtained scaling values for TCSs, , where ρT is the thermal Larmor radius, were compared with the …
`Fingerprint' Fine Structure in the Solar Decametric Radio Spectrum Solar Physics
Konovalenko, A. A.; Melnik, V. N.; Dorovskyy, V. V. +2 more
We study a unique fine structure in the dynamic spectrum of the solar radio emission discovered by the UTR-2 radio telescope (Kharkiv, Ukraine) in the frequency band of 20 - 30 MHz. The structure was observed against the background of a broadband type IV radio burst and consisted of parallel drifting narrow bands of enhanced emission and absorptio…
The far-infrared properties of broad absorption line quasars from the Sloan Digital Sky Survey
Pu, Xingting
We present the results of a study which uses a sample of 320 Sloan Digital Sky Survey (SDSS) quasars with 1.68≤z≤2.28 inside the Herschel Stripe 82 Survey (HerS) region to compare the mid-infrared (MIR) and far-infrared (FIR) properties of broad absorption line (BAL) and non-BAL quasars. The BAL quasar sample comprises 56 high-ionization BAL (HiBA…
Competence evaluation of COSAC flight spare model mass spectrometer: In preparation of arrival of Philae lander on comet 67P/Churyumov-Gerasimenko
Krüger, Harald; Gautier, Thomas; Meierhenrich, Uwe J. +4 more
The Cometary Sampling and Composition (COSAC) experiment onboard the Philae lander is a combined Gas Chromatograph-Mass Spectrometer targeted to determine the organic composition of the nucleus of comet 67P/Churyumov-Gerasimenko. The COSAC flight-model mass spectrometer (FM-MS) was scheduled to sample volatile organic species from 67P's coma prior…
ExoMars 2016, Orbiter module bus a GNC development update
Kutrowski, N.; Renault, H.; Sergent, N. +3 more
ExoMars programme is part of a cooperation between ESA and Roscosmos. It foresees two missions to Mars that aim to searching for signs of past and present life on Mars, investigating the Martian atmosphere and surface and demonstrating the technologies needed to land on Mars and perform robotic exploration. The first spacecraft launched in early 2…