The Total Solar Irradiance (TSI) varies on all time scales and a major fraction of its variability can be reproduced by considering the appearance and disappearance of features, such as sunspots and faculae, on the solar disk. Other effects (e.g. the so called network), however, are contributing to the variability of the TSI, as evidenced by its un...
Published in ACS central science
The dissociation of excited electron-hole pairs is a microscopic process that is fundamental to the performance of photovoltaic systems. For this process to be successful, the oppositely charged electron and hole must overcome an electrostatic binding energy before they undergo ground state recombination. It has been observed previously that the pr...
The IceCube Neutrino Observatory has established the existence of a high-energy all-sky neutrino flux of astrophysical origin. This discovery was made using events interacting within a fiducial region of the detector surrounded by an active veto and with reconstructed energy above 60 TeV, commonly known as the high-energy starting event sample (HES...
One of the driving objectives behind the Parker Solar Probe (PSP) mission is to cross into the magnetically closed corona and to observe the coronal plasma in situ. The transition from open to closed coronal phenomena can be a nuanced distinction, but in gross terms the key boundary is the "Alfvén Point." This is the surface at which the bulk flow ...
We present Parker Solar Probe observations of an in situ Type III radio burst. On 2020 May 27, during PSP's fifth encounter with the Sun, the PSP FIELDS/RFS radio receiver observed a Type III radio burst extending down to the local plasma frequency. Locally generated Langmuir waves are also present, apparent in the RFS spectral data and captured in...
The exponential growth of data volume experienced by astronomy and astrophysics causes new disciplines like machine learning (ML) and data mining (DM) to gain more and more ground in these fields. Applications like clustering, feature selection, automatic classification of events are proving to be a valuable aid in exploiting space data in the era ...
During its initial several orbits of the Sun, Parker Solar Probe (PSP) observed abundant switchbacks, which are characterized by rapid magnetic field polarity reversals. These observations pose many open questions in regards to the nature of switchbacks, for example, how are they generated and how stable are they propagate through the inner heliosp...
Solar Orbiter is designed to discover the fundamental connections between the rapidly varying solar atmosphere and the solar wind. In operations since mid-2020, the Solar Wind Analyzer (SWA) plasma package is now providing comprehensive in-situ measurements of the solar wind. In particular, the Proton-Alpha Sensor (PAS) is determining the propertie...
Whistler waves were widely observed during the first solar encounters of Parker Solar Probe. The interaction of these electromagnetic waves with the strahl electrons is known to affect the heat flux and PSP brings the first opportunity to study them in the young solar wind. We present several examples of whistler wave analysis during PSP's 1st enco...
During its first 174 days at heliocentric distances less than 0.5 au, Parker Solar Probe encountered hundreds of narrowband electromagnetic wave bursts in the whistler frequency range. These events typically lasted on the order of minutes, although narrowband storms lasting longer than one hour were observed as well. The FIELDS instrument measures ...
