- 1CNRS-University of Orleans, LPC2E, Orleans CEDEX 2, France (vkrasnos@cnrs-orleans.fr)
- 2SSL, UCB, Berkeley, CA, 94720, USA
- 3Space Research Laboratory, University of Turku, Turku, Finland
- 4ISSI, Bern, Switzerland
- 5University of Uzhgorod, Uzhgorod, Ukraine
- 6Istituto per la Scienza e la Tecnologia dei Plasmi, Consiglio Nazionale delle Ricerche, 70126 Bari, Italy
- 7Physics Department, UCB, Berkeley, CA, USA
- 8École Polytechnique - Institut Polytechnique de Paris/Sorbonne Université, Rte de Saclay, 91120 Palaiseau, France
- 9IZMIRAN, Institute of Terrestrial Magnetism, Ionosphere. and Radio Wave Propagation, Russian Academy of Sciences. Russia, 142092, Troitsk, Moscow Region
- 10Physics Department, University of Orleans, Orleans, France
- 11University of Sheffield, Sheffield, S10 2TN, UK
The Parker Solar Probe and Solar Orbiter missions are uniquely equipped to study Type III solar radio bursts. Both spacecraft measure two components of the radio-frequency electric field with unprecedented time and frequency resolution. In addition, for the first time, both spacecraft are equipped with high-frequency magnetic sensors (up to 1 MHz), allowing direct measurements of the magnetic component of both Z-mode (slow extraordinary) and ordinary electromagnetic wave modes.
PSP repeatedly came closer to the source region than any other satellite before. This unique combination of capabilities provided exceptional data. The analysis of these wave data provided unambiguous evidence of the basic elements of the wave generation mechanisms: the initial generation of Langmuir or slow extraordinary waves, and the transformation of the primary waves into electromagnetic waves, producing fundamental and harmonic electromagnetic waves.
A major discovery is the determination of the polarization properties of these emissions: the fundamental emission is produced as a highly polarized ordinary wave, while the harmonic emission is produced as a much more diffuse, weakly polarized combination of ordinary and extraordinary waves. This discovery can be used to distinguish between fundamental and harmonic emissions.
These experimental studies were accompanied by theoretical and computer simulation studies, which allowed to determine the main physical mechanism of fundamental emission generation as a direct transformation of electrostatic waves into electromagnetic waves, and to confirm the generation of harmonic emission as a result of coupling of primary and reflected quasi-electrostatic waves.
The authors are greatful to ISSI for the support of the team "Beam Plasma Interaction and Type III Solar Radiobursts", and financial support by
NASA Grants: 80NSSC20K0697 and 80NSSC21K1770, and CNES Grants: “Parker Solar Probe” and “Solar Orbiter”
How to cite: Krasnosselskikh, V., Jebaral, I. C., Pulupa, M., Dudok de Wit, T., Voshchepynets, A., Larosa, A., Bale, S. D., Krafft, C., Volokitin, A., Agapitov, O., Cooper, T., Kretzschmar, M., and Balikhin, M.: Type III Solar Radio Bursts: recent progress due to PSP and Solar Orbiter measurements, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-18165, https://doi.org/10.5194/egusphere-egu25-18165, 2025.
