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Effects of Solar Activity on the Local Interstellar Magnetic Field Observed by Voyager 1 and IBEX
McComas, D. J.; Schwadron, N. A.
Interstellar Boundary Explorer (IBEX) observations have shown enhanced energetic neutral atom emission from a narrow, circular ribbon likely centered on the direction of the magnetic field in the local interstellar medium (LISM). IBEX observations are compared to Voyager 1's direct observations of the magnetic field in the LISM, which reveals stru…
The transient topside layer and associated current sheet in the ionosphere of Mars
Gurnett, Donald A.; Halekas, Jasper S.; DiBraccio, Gina A. +2 more
Radar soundings from the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) instrument on board the Mars Express spacecraft have shown that transient layers exist in the dayside upper ionosphere of Mars. The most prominent of these features is a second layer at an altitude near 200 km, well above that of the main photoionization l…
The 26 December 2001 Solar Eruptive Event Responsible for GLE63: III. CME, Shock Waves, and Energetic Particles
Klein, K. -L.; Grechnev, V. V.; Kochanov, A. A. +2 more
The SOL2001-12-26 moderate solar eruptive event (GOES importance M7.1, microwaves up to 4000 sfu at 9.4 GHz, coronal mass ejection (CME) speed 1446 km s−1) produced strong fluxes of solar energetic particles and ground-level enhancement (GLE) of cosmic-ray intensity (GLE63). To find a possible reason for the atypically high proton outco…
Ridge-like lava tube systems in southeast Tharsis, Mars
Huang, Jun; Xiao, Long; Zhao, Jiannan +2 more
Lava tubes are widely distributed in volcanic fields on a planetary surface and they are important means of lava transportation. We have identified 38 sinuous ridges with a lava-tube origin in southeast Tharsis. The lengths vary between 14 and 740 km, and most of them occur in areas with slopes < 0.3°. We analyzed their geomorphology in detail …
Opposition effect on comet 67P/Churyumov-Gerasimenko using Rosetta-OSIRIS images
Jorda, L.; Lamy, P. L.; Lara, L. M. +46 more
Aims: We aim to explore the behavior of the opposition effect as an important tool in optical remote sensing on the nucleus of comet 67P/ Churyumov-Gerasimenko (67P), using Rosetta-OSIRIS images acquired in different filters during the approach phase, July-August 2014 and the close flyby images on 14 of February 2015, which contain the spacec…
Imaging Observations of Magnetic Reconnection in a Solar Eruptive Flare
Sun, X.; Ding, M. D.; Li, Y. +2 more
Solar flares are among the most energetic events in the solar atmosphere. It is widely accepted that flares are powered by magnetic reconnection in the corona. An eruptive flare is usually accompanied by a coronal mass ejection, both of which are probably driven by the eruption of a magnetic flux rope (MFR). Here we report an eruptive flare on 201…
Detection of the high-energy cut-off from the Seyfert 1.5 galaxy NGC 5273
Misra, R.; Dewangan, G. C.; McHardy, I. M. +2 more
We perform the NuSTAR and Swift/XRT joint energy spectral fitting of simultaneous observations from the broad-line Seyfert 1.5 galaxy NGC 5273. When fitted with the combination of an exponential cut-off power law and a reflection model, a high-energy cut-off is detected at 143^{+96}_{-40} keV with 2σ significance. Existence of such cut-off is also…
The spatially resolved stellar population and ionized gas properties in the merger LIRG NGC 2623
Villar-Martín, M.; Roth, M. M.; González Delgado, R. M. +10 more
We report on a detailed study of the stellar populations and ionized gas properties in the merger LIRG NGC 2623, analyzing optical integral field spectroscopy from the CALIFA survey and PMAS LArr, multiwavelength HST imaging, and OSIRIS narrow band Hα and [NII]λ6584 imaging. The spectra were processed with the starlight full spectral fitting code,…
Review of Image Quality Measures for Solar Imaging
Popowicz, Adam; Bernacki, Krzysztof; Orlov, Valeri +1 more
Observations of the solar photosphere from the ground encounter significant problems caused by Earth's turbulent atmosphere. Before image reconstruction techniques can be applied, the frames obtained in the most favorable atmospheric conditions (the so-called lucky frames) have to be carefully selected. However, estimating the quality of images co…
Martian ionosphere observed by Mars Express. 2. Influence of solar irradiance on upper ionosphere and escape fluxes
Barabash, S.; Pätzold, M.; Dubinin, E. +4 more
We present multi-instrument observations of the effects of solar irradiance on the upper Martian ionosphere and escape fluxes based on Mars Express measurements obtained over almost 12 years. It is shown that the variations in the upper ionosphere caused by solar irradiance lead to significant changes in the trans-terminator fluxes of low-energy i…