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An improved algorithm for separating clock delays from ionospheric effects in radio astronomy
C. M. Cordun, M. A. Brentjens, H. K. Vedantham +1
Context: Low-frequency radio observations are heavily impacted by the ionosphere, where dispersive delays can outpace even instrumental clock offsets, posing a serious calibration…
Bright unintended electromagnetic radiation from second-generation Starlink satellites
C. G. Bassa, F. Di Vruno, B. Winkel +3
We report on the detection of unintended electromagnetic radiation (UEMR) from the second-generation of Starlink satellites. Observations with the LOFAR radio telescope between 10…
Unintended electromagnetic radiation from Starlink satellites detected with LOFAR between 110 and 188 MHz
F. Di Vruno, B. Winkel, C. G. Bassa +4
We report on observations of 68 satellites belonging to the SpaceX Starlink constellation with the LOFAR radio telescope. Radiation associated with Starlink satellites was detected…
Tied-array holography with LOFAR
P. Salas, M. A. Brentjens, D. D. Bordenave +2
A radio interferometer uses time delays to maximize its response to radiation coming from a particular direction. These time delays compensate for differences in the time of arriva…
The first power spectrum limit on the 21-cm signal of neutral hydrogen during the Cosmic Dawn at z=20-25 from LOFAR
B. K. Gehlot, F. G. Mertens, L. V. E. Koopmans +19
Observations of the redshifted 21-cm hyperfine line of neutral hydrogen from early phases of the Universe such as Cosmic Dawn and the Epoch of Reionization promise to open a new wi…
Cobalt: A GPU-based correlator and beamformer for LOFAR
P. Chris Broekema, J. Jan David Mol, Ronald Nijboer +5
For low-frequency radio astronomy, software correlation and beamforming on general purpose hardware is a viable alternative to custom designed hardware. LOFAR, a new-generation rad…