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Radio Signature of the Strong Compression between a Streamer and a Coronal Hole Boundary
Aguilar-Rodriguez, E.; Vourlidas, A.; Corona-Romero, P. +8 more
We present evidence of the first detection of the radio signature at metric wavelengths of the strong compression between a helmet streamer (HS) and the boundary of a coronal hole (CH) using radio observations from the Callisto MEXICO-LANCE and ALASKA-HAARP systems and white-light observations obtained by the STEREO-A/COR1-COR2 coronagraphs. The e…
A lost-in-space star identification algorithm based on regularized pattern recognition
Ozyurt, Erdem Onur; Aslan, Alim Rustem
Accuracy in spacecraft attitude determination has been improved continuously in parallel to scientific payloads requiring higher accuracy. Star trackers aim to maintain attitude determination by matching observations to the reference stars. They provide very high accuracy at any point in space at cost of higher computational complexity. This study…
Proprioceptive swarms for celestial body exploration
Cottiga, Simone; Caruso, Matteo; Gallina, Paolo +1 more
The exploration of small celestial bodies has been a very active field ever since the dawn of space exploration. However, traditional approaches based on monolithic landers allow only the area in the immediate vicinity to the landing spot to be examined. Using mobile systems like rovers allow for better coverage, but at considerable cost and compl…
A JWST MIRI MRS View of the η Tel Debris Disk and Its Brown Dwarf Companion
Law, David R.; Chen, Christine H.; Hines, Dean C. +12 more
We report JWST Mid-Infrared Instrument (MIRI) Medium Resolution Spectrograph (MRS) observations of the β Pic moving-group member, η Tel A, along with its brown dwarf binary companion, η Tel B. Following point-spread-function subtraction, we recover the spatially resolved flux from the debris disk around η Tel A, along with the position of the comp…
Investigative study of five low mass ratio semi-detached binaries
Stassun, Keivan G.; Parthasarathy, Mudumba; Jagirdar, Rukmini +2 more
We present the first pulsation analysis of four totally eclipsing Algol systems S Cnc, SS Cet, TW And, and VW Cyg using the latest data available from Kepler (K2), and TESS databases. Based on the characteristics observed they are classified to be oscillating eclipsing Algol binaries with primary components having
Spectropolarimetric Radio Imaging of Faint Gyrosynchrotron Emission from a CME: A Possible Indication of the Insufficiency of Homogeneous Models
Mondal, Surajit; Oberoi, Divya; Kansabanik, Devojyoti
The geo-effectiveness of coronal mass ejections (CMEs) is determined primarily by their magnetic fields. Modeling of gyrosynchrotron (GS) emission is a promising remote sensing technique to measure the CME magnetic field at coronal heights. However, faint GS emission from CME flux ropes is hard to detect in the presence of bright solar emission fr…
Dust-dust collisions in cometary comas: applications to comet 67P/Churyumov-Gerasimenko
Planes, María Belén; Parisi, M. Gabriela; Millán, Emmanuel N. +2 more
Silica has emerged as a crucial component within inner comet comas. This work investigates silica dust aggregates and their interactions within cometary comas. We study the probability that aggregates in the size range 1-100 µm collide with each other in the coma and analyse the outcomes of such collisions by using the 'Collision of Porous Aggrega…
WawHelioIonMP: A Semiempirical Tool for the Determination of Latitudinal Variation in the Ionization Rate of Interstellar Hydrogen and the Solar Wind
Bzowski, M.; Porowski, C.
The latitudinal structure of the solar wind varies during the cycle of solar activity. Analysis of this variation is important for understanding the solar activity and interpretation of observations of heliospheric energetic neutral hydrogen atoms and interstellar neutral (ISN) atoms inside the heliosphere, which yield information on the heliosphe…
Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs (Corrigendum)
Thévenin, Frédéric; Kervella, Pierre; Arenou, Frédéric
Amazonian Tectonic Evolution of Ceraunius and Tractus Fossae, Mars, and Implications for Local Magmatic Sources
Byrne, Paul K.; Shahrzad, Stephanie; Bramham, Emma K. +2 more
The heavily faulted Martian terrains of Ceraunius Fossae and Tractus Fossae, south of the Alba Mons volcano, have previously only been considered as parts of larger tectonic studies of Alba Mons, and consequently the complexity of the faulting remains unclear. As these terrains are in the midst of the large Tharsis volcanoes, the study of their su…