Search Publications
Coronal spectroscopy: Probing sources of slow solar wind in active regions, and the early phases of solar flares
Harra, Louise K.
Coronal spectroscopy has pushed forward the understanding of physical processes in all phenomena on the Sun. In this review we concentrate specifically on plasma parameters measured in sources of the slow solar wind in active regions and the early phases of solar flares. These topics are a key part of the science goals of the Solar Orbiter mission…
Solar wind H+ fluxes at 1 AU for solar cycles 23 and 24
Sznajder, Maciej
The solar wind consists of electrons and ion species having kinetic energy ≲ 10 keVs. Ion stream is mainly composed of protons. Their flux magnitude is especially important for radiation hardness assurance scientists who qualify materials for future space missions. Materials irreversibly degrade as soon as are exposed to solar radiation. Hence, pr…
Magnetic connectivity and solar energetic proton event intensity profiles at deka-MeV energy
Paassilta, Miikka; Raukunen, Osku; Vainio, Rami +3 more
We present an analysis of the time-intensity profiles of 25 solar energetic proton events at 18.2 MeV, modelled by fitting an analytical function form (a modified Weibull function) to the observed intensities. Additionally relying on previous work that characterized the magnetic connectivity between the event-related solar flare and the observer i…
A new approach to retrieve total electron content based on dual-band echoes of MARSIS radar sounder
Wang, Longxiang; Ye, Hongxia
This paper proposes a new dual-band difference (DBD) method to retrieve total electron content (TEC) in Martian ionosphere with the dual-band echoes of the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS). It establishes the relationship between the group delay difference of two-band echoes and the plasmas frequency. Then the Ma…
Statistical analysis of the relationship between Power spectral density of magnetic turbulence and ion velocity in magnetotail bursty bulk Flows
Du, A. M.; Wu, Q.; Wang, G. Q.
Based on the observation of the THEMIS satellites, we utilize the superposed epoch method to statistically analyze how the p (Power Spectral Density) of compressional and transverse components of the magnetic field is affected by the ion inflow velocity V⊥ which is the peak velocity of BBFs (Bursty Bulk Flows). The analysis demonstrated…
The first photometric, period variation, and flare activity studies of TIC 24233294: Reviewing with the latest results of well-studied late-type active binaries
Jagirdar, Rukmini; Devarapalli, Shanti Priya; Pothuneni, Ravi Raja +2 more
In the current study, we present the first photometric, period variation, and flaring activity investigations of TIC 24233294. Additionally, we also review and report the flaring activity of five well-studied eclipsing binaries BX Tri, V405 And, GJ 3236, Thor 42, and GU Boo. Using the Transiting Exoplanet Survey Satellite (TESS) data, continuous v…
Development and coupling test of active spacecraft potential control - Next generation (ASPOC-NG)
Cipriani, Fabrice; Nakamura, Rumi; Steller, Manfred +7 more
The active spacecraft potential control (ASPOC) system developed in the 1990s emits positive ions to neutralise the spacecraft potential, such as used in several missions like Geotail, Equator-S, Cluster, Doublestar and MMS. With the experience gained, the next generation of the active spacecraft potential control (ASPOC-NG) instrument has been de…
Photometric and Period Variation study of two contact binaries ASAS J034931-0431.2 and KIC 11413213
Jagirdar, Rukmini; Devarapalli, Shanti Priya; Wakgari, Dereje
We present the first photometric analysis of ASAS J034931-0431.2 and KIC 11413213, two short-period eclipsing contact binaries. Photometric analysis using the Wilson-Devinney method was performed using TESS, Kepler 2, and Gaia DR3 data available. Based on the collected times of minima, period variation studies were carried out and the orbital peri…