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The mid-high latitude whistler mode chorus waves observed around substorm onsets
Cao, JinBin; Yang, JunYing; Yan, ChunXiao +2 more
Using the data of LFEW/TC-2, we studied the dawn side chorus around substorm onsets during a strong geomagnetic storm in November 2004. During this storm, LFEW/TC-2 observed 14 dawnside chorus events. Nine of them were associated with substorms and occurred within 40 min around the substorm onsets. The frequencies of waves have a very good correla…
Do Photospheric Brightness Structures Outside Magnetic Flux Tubes Contribute to Solar Luminosity Variation?
Bernasconi, Pietro N.; Foukal, Peter
Variations in total solar irradiance (TSI) correlate well with changes in projected area of photospheric magnetic flux tubes associated with dark sunspots and bright faculae in active regions and network. This correlation does not, however, rule out possible TSI contributions from photospheric brightness inhomogeneities located outside flux tubes …
The relationship between j × B and ∇·Pe in the magnetotail plasma sheet: Cluster observations
Lucek, E.; Fazakerley, A. N.; Owen, C. J. +6 more
In this paper we report an extension to Henderson et al.'s (2006) case study, in which we investigate the generality of the anticorrelation between the ∇·?e and j × B terms in Ohm's law observed in the plasma sheet. Further current sheet crossings are investigated which occurred on 17 August 2003 and 24 September 2003. Data from this pe…
Periodic traveling compression regions during quiet geomagnetic conditions and their association with ground Pi2
Dandouras, I.; Lucek, E.; Hasegawa, H. +5 more
Recently, Keiling et al. (2006) showed that periodic (~90 s) traveling compression regions (TCRs) during a substorm had properties of Pi2 pulsations, prompting them to call this type of periodic TCRs "lobe Pi2". It was further shown that time-delayed ground Pi2 had the same period as the lobe Pi2 located at 16 RE, and it was concluded t…
Modeling of the Extreme-Ultraviolet and Soft X-Ray Emission in a Solar Coronal Bright Point
Warren, Harry P.; Brooks, David H.
Previous studies have been able to reproduce both the observed intensities and the morphology of high-temperature solar plasma using steady state heating models. These models, however, have been unable to reproduce the lower temperature emission observed in active regions. Here we present results from numerical simulations of a coronal bright poin…
Scale height of the thin galactic disk in solar neighborhood
Zhu, Z.; Kong, D. L.
Thanks to astrometric data of unprecedented accuracy from Hipparcos Catalogue
(ESA 1997), it becomes possible to investigate, by directly counting stars, the scale height of the thin Galactic disk in solar neighborhood defined by the perpendicular distribution of stellar populations. In order to trace out the evolution of scale height, which …Instrumental Response Function for Filtergraph Instruments
Wachter, R.
Dopplergrams and magnetograms arising from filtergraph instruments such as the Michelson Doppler Imager (MDI), the Helioseismic and Magnetic Imager (HMI), or the Hinode Narrow Band Filter Imager are generally associated with observation heights that are derived from the contribution function of the targeted absorption line, irrespective of the ins…
Secondary Photons from High-Energy Protons Accelerated in Hypernovae
Asano, Katsuaki; Mészáros, Peter
Recent observations show that hypernovae may deposit some fraction of their kinetic energy in mildly relativistic ejecta. In the dissipation process of such ejecta in a stellar wind, cosmic-ray protons can be accelerated up to ~1019 eV. We discuss the TeV to MeV gamma-ray and the X-ray photon signatures of cosmic rays accelerated in hyp…
Comment on “Comparison of the composition of the Tempel 1 ejecta to the dust in Comet C/Hale Bopp 1995 O1 and YSO HD 100546” by C.M. Lisse, K.E. Kraemer, J.A. Nuth III, A. Li, D. Joswiak [2007. Icarus 187, 69 86]
Bockelée-Morvan, Dominique; Crovisier, Jacques
Lisse et al. [Lisse, C.M., Kraemer, K.E., Nuth III, J.A., Li, A., Joswiak, D., 2007. Icarus 187, 69-86] recently presented a new analysis of an ISO spectrum of Comet C/1995 O1 (Hale-Bopp), from which they claimed the identification of many new dust species. Among them are PAHs, which were not found in our first analysis of the ISO spectra. We pres…
High-Energy Properties of PKS 1830-211
Torres, Diego F.; Zhang, Shu; Wang, Jian-Min +4 more
We report an analysis of X-ray and γ-ray observations of PKS 1830-211, based on long-term campaigns carried out by INTEGRAL and COMPTEL. The INTEGRAL data currently available provide a 33 σ significance detection in the 20-100 keV band, while the COMPTEL 6 yr data provide a 5.2 σ significance detection in the 1-3 MeV energy band. In hard X-rays, I…