Search Publications
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…
Solar jets observed with the Interface Region Imaging Spectrograph (IRIS)
Schmieder, Brigitte; Joshi, Reetika; Chandra, Ramesh
Solar jets are impulsive, collimated plasma ejections that are triggered by magnetic reconnection. They are observed for many decades in various temperatures and wavelengths, therefore their kinematic characteristics, such as velocity and recurrence, have been extensively studied. Nevertheless, the high spatial resolution of the Interface Region I…
Uncovering the process that transports magnetic helicity to coronal mass ejection flux ropes
Pal, Sanchita
Magnetic helicity, an intrinsic property of eruptive helical flux ropes (FRs) forming coronal mass ejections (CMEs), plays an important role in determining CME geoeffectiveness. In the solar atmosphere and heliosphere, helicity remains conserved in a closed volume. Considering this fact as a basis of our study, we perform a quantitative comparison…
Over-expansion of coronal mass ejections modelled using 3D MHD EUHFORIA simulations
Poedts, Stefaan; Scolini, Camilla; Schmieder, Brigitte +5 more
Coronal mass ejections (CMEs) are large scale eruptions observed close to the Sun. They are travelling through the heliosphere and possibly interacting with the Earth environment creating interruptions or even damaging new technology instruments. Most of the time their physical conditions (velocity, density, pressure) are only measured in situ at …