A5038339942- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Radio Astronomy Observations and Technology
- Astro and Planetary Science
- Solar Radiation and Photovoltaics
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Geomagnetism and Paleomagnetism Studies
- Gamma-ray bursts and supernovae
- Spacecraft Design and Technology
- Astronomical Observations and Instrumentation
- Atmospheric Ozone and Climate
- Adaptive optics and wavefront sensing
- Scientific Research and Discoveries
- Spacecraft and Cryogenic Technologies
- History and Developments in Astronomy
- Cosmology and Gravitation Theories
- Energy Harvesting in Wireless Networks
- Spectroscopy and Laser Applications
- Antenna Design and Analysis
- Antenna Design and Optimization
- Galaxies: Formation, Evolution, Phenomena
Università della Svizzera italiana
2021-2024
Istituto Ricerche Solari Locarno
2019-2024
Uppsala University
2024
Universidad Complutense de Madrid
2023
ETH Zurich
2013-2022
Institute of Particle Physics
2022
Sultan Zainal Abidin University
2016
Institute of Astronomy
2016
Universiti Teknologi MARA System
2016
Cardiff University
2016
The Multi Unit Spectroscopic Explorer (MUSE) is a second-generation VLT panoramic integral-field spectrograph currently in manufacturing, assembly and integration phase. MUSE has field of 1x1 arcmin2 sampled at 0.2x0.2 arcsec2 assisted by the ground layer adaptive optics ESO facility using four laser guide stars. instrument large 24 identical high performance integral units, each one composed an advanced image slicer, 4kx4k detector. In this paper we review progress manufacturing report...
The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) is a radio interferometer array currently in development, with an initial 256-element to be deployed at the South African Radio Astronomy Observatory (SARAO) Square Kilometer Array (SKA) site Africa. Each of 6m, $f/0.23$ dishes will instrumented dual-polarisation feeds operating over frequency range 400-800 MHz. Through intensity mapping 21 cm emission line neutral hydrogen, HIRAX provide cosmological survey distribution...
Context: Hydrides of the most abundant heavier elements are fundamental molecules in cosmic chemistry. Some them trace gas irradiated by UV or X-rays. Aims: We explore abundances major hydrides W3 IRS5, a prototypical region high-mass star formation. Methods: IRS5 was observed HIFI on Herschel Space Observatory with deep integration (about 2500 s) 8 spectral regions. Results: The target lines including CH, NH, H3O+, and new SH+, H2O+, OH+ detected. H2O+ J=1-0 found mostly absorption, but...
We report on the 2017 September 10 ground level enhancement (GLE) event associated with a coronal mass ejection (CME) whose initial acceleration (~9.1km s^-2) and speed (~4300 km/s) were among highest observed in SOHO era. The GLE was of low intensity (~4.4% above background) softer-than-average fluence spectrum. suggest that poor connectivity (longitudinal latitudinal) source to Earth compounded by weaker ambient magnetic field contributed these properties. Events similar high either lacked...
The solar burst extinguish from the Sun's corona atmosphere and it dynamical structure of magnetic field in radio wavelength are studied. Observation with Compact Astronomical Low cost frequency Instrument for Spectroscopy Transportable Observatory (CALLISTO) ETH, Zurich range 45 until 870 MHz. done at Pusat Angkasa Negara, Banting, Selangor successfully detected type III on 9th March 2012 4:22:00 UT 4:28:00 UT. emission is associated M6.3 flare which occurred sunspot AR1429 03:58UT were...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Z. S. Hamidi, N. M. Anim, Shariff, Abidin, A. Ibrahim, C. Monstein; Dynamical structure of solar radio burst type III as evidence energy flares. AIP Conf. Proc. 8 May 2013; 1528 (1): 11–15. https://doi.org/10.1063/1.4803559 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers...
We present a multi-frequency far-field beam map for the 5m dish telescope at Bleien Observatory measured using commercially available drone. describe hexacopter drone used in this experiment, design of flight pattern, and data analysis scheme. This is first application calibration method to single radio far-field. The high signal-to-noise allows us characterise pattern with accuracy out least 4th side-lobe. resulting 2D compared that derived from more traditional approach an astronomical...
On November 4th, 2015 secondary air traffic control radar was strongly disturbed in Sweden and some other European countries. The disturbances occurred when the antennas were pointing at Sun. In this paper, we show that coincided with time of peaks an exceptionally strong (∼10 5 Solar Flux Units) solar radio burst a relatively narrow frequency range around 1 GHz. This indicates is most probable space weather candidate for explaining disturbances. dynamic spectrum shows high flux densities...
Abstract Type II radio bursts are generally observed in association with flare-generated or coronal-mass-ejection-driven shock waves. The exact and coronal conditions necessary for the production of type emission still under debate. Shock waves important acceleration electrons generation emission. Additionally, geometry closed field line topology, e.g., quasi-perpendicular regions shocks interacting streamers, play an role In this study we perform a 3D reconstruction modeling wave during...
The core architecture, tests in the lab and first results of a Fast Fourier Transform (FFT) spectrometer are described. It is based on commercially available fast digital sampler (AC240) with an on-board Field Programmable Gate Array (FPGA). works continuously has remarkable total bandwidth 1 GHz, resolved into 16384 channels. data sampled 8 bits, yielding dynamic range 48 dB. An Allan time more than 2000 s SFDR 37 dB were measured. First light observations KOSMA telescope show perfect...
21cm intensity mapping is a novel approach aimed at measuring the power spectrum of density fluctuations and deducing cosmological information, notably from Baryonic Acoustic Oscillations (BAO). We give an update on progress BAO Integrated Neutral Gas Observations (BINGO) which single dish project. First we explain basic ideas behind concept before updating instrument design for BINGO. also outline survey plan to make its projected science output including estimates parameters.
The Heterodyne Instrument for the Far Infrared (HIFI) onboard Herschel Space Observatory allows first observations of light diatomic molecules at high spectral resolution and in multiple transitions. Here, we report deep integrations using HIFI different lines hydrides towards high-mass star forming region AFGL 2591. Detected are CH, CH+, NH, OH+, H2O+, while NH+ SH+ have not been detected. All except CH CH+ seen absorption with low excitation temperatures velocities from systemic velocity...
The measurement of diffuse 21-cm radiation from the hyperfine transition neutral hydrogen (HI signal) in different redshifts is an important tool for modern cosmology. However, detecting this faint signal with non-cryogenic receivers single-dish telescopes a challenging task. BINGO (Baryon Acoustic Oscillations Integrated Neutral Gas Observations) radio telescope instrument designed to detect baryonic acoustic oscillations (BAOs) cosmological HI signal, redshift interval $0.127 \le z 0.449$....
Theoretically scalar potential Φ waves with a longitudinal electric field in the direction of propagation must exist. A centrally fed ball antenna, 6 cm diameter, producing pulsating 433.59 MHz spherical source charge, generated such wave, that was detected by an identical antenna. The longitudinality demonstrated intervening cubic array 9 half-wavelength wires, absorbed wave when wires were parallel (but not perpendicular) to propagation. signal from antenna source, placed 4.0 m above...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Z. S. Hamidi, Abidin, A. Ibrahim, N. M. Shariff, C. Monstein; Observations of coronal mass ejections (CMEs) at low frequency radio region on 15th April 2012. AIP Conf. Proc. 8 May 2013; 1528 (1): 55–60. https://doi.org/10.1063/1.4803568 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends...
The Sun is an ideal object of a blackbody with large and complex magnetic field. In solar activity specifically flare phenomenon, the reconnection one most significant factors that can simplify better understanding our nearest star. This factor due to motion plasma other particles through convection mechanism inside Sun. work, we will highlight burst events associated flares. event occurred on 13th November 2012 from 2:00:03 UT till 2:00:06 UT. It peaked M2.0 at 2.04 Within short time...