Search Publications
Eight Years of TIGRE Robotic Spectroscopy: Operational Experience and Selected Scientific Results
Nazé, Yaël; Rauw, Gregor; Jack, Dennis +4 more
TIGRE (Telescopio Internacional de Guanajuato Robótico Espectroscópico) has been operating in fully robotic mode in the La Luz Observatory (Guanajuato, Mexico) since the end of 2013. With its sole instrument, HEROS, an échelle spectrograph with a spectral resolution R ∼20,000, TIGRE has collected more than 48,000 spectra of 1,151 different sources…
Predicting CME arrival time through data integration and ensemble learning
Xu, Yan; Jing, Ju; Wang, Haimin +7 more
The Sun constantly releases radiation and plasma into the heliosphere. Sporadically, the Sun launches solar eruptions such as flares and coronal mass ejections (CMEs). CMEs carry away a huge amount of mass and magnetic flux with them. An Earth-directed CME can cause serious consequences to the human system. It can destroy power grids/pipelines, sa…
Three-dimensional magnetic fields of molecular clouds
Tahani, Mehrnoosh
To investigate the role of magnetic fields in the evolution of the interstellar medium, formation and evolution of molecular clouds, and ultimately the formation of stars, their three-dimensional (3D) magnetic fields must be probed. Observing only one component of magnetic fields (along the line of sight or parallel to the plane of the sky) is ins…
The Space Physics Environment Data Analysis System in Python
Miyoshi, Yoshizumi; Le Contel, Olivier; Matsuda, Shoya +13 more
In this article, we describe the free, open-source Python-based Space Physics Environment Data Analysis System (PySPEDAS), a platform for multi-mission, multi-instrument retrieval, analysis, and visualization of Heliophysics data. PySPEDAS currently contains load routines for data from 23 space missions, as well as a variety of data from ground-ba…
Primary and albedo protons detected by the Lunar Lander Neutron and Dosimetry experiment on the lunar farside
Xu, Zigong; Guo, Jingnan; Wimmer-Schweingruber, Robert F. +4 more
The Lunar Lander Neutron and Dosimetry (LND) Experiment aboard the Chang'E-4 Lander on the lunar far-side measures energetic charged and neutral particles and monitors the corresponding radiation levels. During solar quiet times, galactic cosmic rays (GCRs) are the dominating component of charged particles on the lunar surface. Moreover, the inter…
Kelvin-Helmholtz Vortices as an Interplay of Magnetosphere-Ionosphere Coupling
Russell, C. T.; Escoubet, C. P.; Torbert, R. B. +11 more
The solar wind-magnetosphere interaction drives diverse physical processes on the flanks of Earth's magnetopause, and in turn these processes couple to the ionosphere. We investigate simultaneous multipoint in-situ spacecraft and ground-based measurements to determine the role of Kelvin-Helmholtz waves at the Earth's magnetopause and the low-latit…
Rapid variations of Si IV spectra in a flare observed by interface region imaging spectrograph at a sub-second cadence
Polito, Vanessa; Yu, Sijie; De Pontieu, Bart +2 more
We report on observations of highly-varying Si IV 1402.77 Å line profiles observed with the Interface Region Imaging Spectrograph (IRIS) during the M-class flare from 2022 January 18 at an unprecedented 0.8 s cadence. Moment analysis of this line observed in flare ribbon kernels showed that the intensity, Doppler velocity, and non-thermal broadeni…
Implications of Kappa Suprathermal Halo of the Solar Wind Electrons
Pierrard, Viviane; Lazar, Marian; Stverak, Stepan
The electron velocity distributions measured in-situ in space plasmas reveal two central populations, a low-energy and highly dense (quasi-)thermal core, and a more diffuse but hotter suprathermal halo. Even if the core contributes much more to the total number density than the suprathermal particles, the energetic electrons play an important role…
A Multi-Event Study of Early-Stage SEP Acceleration by CME-Driven Shocks—Sun to 1 AU
Zucca, Pietro; Kozarev, Kamen; Nedal, Mohamed +2 more
The solar corona between below 10 solar radii is an important region for early acceleration and transport of solar energetic particles (SEPs) by coronal mass ejection-driven shock waves. There, these waves propagate into a highly variable dynamic medium with steep gradients and rapidly expanding coronal magnetic fields, which modulates the particl…
Exoplanet Two-Square Degree Survey With SAO RAS Robotic Facilities
Korablev, Oleg I.; Valeev, Azamat F.; Yakovlev, Oleg Ya. +15 more
We used the 0.5-m robotic telescope located at the Special Astrophysical Observatory of the Russian Academy of Sciences for monitoring two square degrees of the sky with the aim of detecting new exoplanets. A dimming of the visible brightness is expected due to the exoplanets transiting their host stars. We analyzed about 25,000 raw images of star…