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Relationship between solar energetic particle intensities and coronal mass ejection kinematics using STEREO/SECCHI field of view
Michalek, Grzegorz; Ravishankar, Anitha
Solar energetic particles (SEPs) accelerated from shocks driven by coronal mass ejections (CMEs) are one of the major causes of geomagnetic storms on Earth. Therefore, it is necessary to predict the occurrence and intensity of such disturbances. For this purpose we analyzed in detail 38 non-interacting halo and partial halo CMEs, as seen by the So…
Clustered star formation toward Berkeley 87/ON2. I. Multiwavelength census and the population overlap problem
Alves, João; Garcia, Miriam; Jiménez-Bailón, Elena +3 more
Context. Disentangling line-of-sight alignments of young stellar populations is crucial for observational studies of star-forming complexes. This task is particularly problematic in a Cygnus-X subregion where several components, located at different distances, overlap: the Berkeley 87 young massive cluster, the poorly known [DB2001] Cl05 embedded …
Investigating Toroidal Flows in the Sun Using Normal-mode Coupling
Mani, Prasad; Hanasoge, Shravan
Helioseismic observations have provided valuable data sets with which to pursue the detailed investigation of solar interior dynamics. Among various methods to analyze these data, normal-mode coupling has proven to be a powerful tool, used to study Rossby waves, differential rotation, meridional circulation, and nonaxisymmetric multiscale subsurfa…
Results of the Electron Drift Instrument on Cluster
Baumjohann, W.; Torbert, R. B.; Matsui, H. +7 more
The electron drift instrument (EDI) on Cluster pioneered a new method of measuring electric fields, using a beam of electrons to sample the drift velocity over a km-scale gyro orbit. The technique is especially well suited to measuring weak, sub-mV/m, convection fields due to its sensitivity (to both components in the plane perpendicular to B) and…
New photometric analysis of hot Jupiter: WASP-135b
Erdem, Ahmet; Öztürk, Oğuz
We report photometric follow-up observations of WASP-135b obtained using the 1.23-m telescope at Calar Alto Observatory and 1.00-m telescope at TÜBİTAK National Observatory during the 2017 and 2018 observational seasons. Eight new transit light curves of WASP-135b were analyzed with JKTEBOP code. The ratio of the planet radius to radius of host st…
Interstellar Extinction in the Direction of the Open Cluster King 7 and New Parameters of the Cluster
Straižys, V.; Raudeliūnas, S.; Maskoliūnas, M. +8 more
Interstellar extinction in two concentric square areas of the sizes 1.25 × 1.25 deg2 and 0.2 × 0.2 deg2 in the direction of open cluster King 7 is investigated applying two-dimensional photometric classification of stars observed in the Vilnius seven-color photometric system down to V = 15.5 mag (1084 stars) and 19.5 mag (584…
Effect of Dust Size on the Near-infrared Spectra (1.0-5.0 µm) of Brown Dwarf Atmospheres
Sorahana, Satoko; Kobayashi, Hiroshi; Tanaka, Kyoko K.
In this study, we demonstrate the dependence of atmospheric dust size on the near-infrared spectra of ten L dwarfs, and constrain the sizes of dust grains in each L dwarf atmosphere. In previous studies, by comparing observed and modeled spectra, it was suggested that the deviations of their spectral shapes from theoretical prediction are general …
A Brief Review of the Ring Current and Outstanding Problems
Kronberg, Elena A.; Ilie, Raluca; Fraz Bashir, Muhammad
The Faraday rotation effect in Saturn Kilometric Radiation observed by the CASSINI spacecraft
Lamy, Laurent; Fischer, Georg; Kurth, William S. +7 more
Non-thermal radio emissions from Saturn, known as Saturn Kilometric Radiation (SKR), are analyzed for the Faraday rotation effect detected in Cassini RPWS High Frequency Receiver (HFR) observations. This phenomenon, which mainly affects the lower-frequency part of SKR below 200 kHz, is characterized by a rotation of the semi-major axis of the SKR …
Adventures in Space Science
Doschek, George
This memoir is a summary of my early childhood, education, and research career at the Naval Research Laboratory (NRL) in Washington, DC. I describe my early interest in astronomy and how I wound up working in the fields of solar physics and X-ray-UV spectroscopy of high temperature plasmas. I describe some of my home life and other interests, my e…