Relative Times of Arrival of Bursts of Solar Noise on Different Radio Frequencies

Payne-Scott, Ruby; Yabsley, D. E.; Bolton, J. G.

doi:10.1038/160256b0

Cited by 163 publications

(69 citation statements)

References 2 publications

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“…Type II radio bursts have long been observed in the solar corona associated with solar eruptions (e.g. Payne-Scott, Yabsley, and Bolton, 1947;Wild and McCready, 1950) and it was generally accepted that both type II bursts and Moreton-Ramsey waves (first observed in the 1960s by Moreton, 1960;Moreton and Ramsey, 1960) were signatures of the same driving process (Uchida, 1968). However, the much lower measured speeds and other discrepancies between Moreton-Ramsey and global EIT waves complicated extending this assumption to EIT waves.…”

Section: Introductionmentioning

confidence: 92%

A Statistical Analysis of the Solar Phenomena Associated with Global EUV Waves

et al. 2017

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Solar eruptions are the most spectacular events in our solar system and are associated with many different signatures of energy release including solar flares, coronal mass ejections, global waves, radio emission and accelerated particles. Here, we apply the Coronal Pulse Identification and Tracking Algorithm (CorPITA) to the high-cadence synoptic data provided by the Solar Dynamics Observatory (SDO) to identify and track global waves observed by SDO. 164 of the 362 solar flare events studied (45%) were found to have associated global waves with no waves found for the remaining 198 (55%). A clear linear relationship was found between the median initial velocity and the acceleration of the waves, with faster waves exhibiting a stronger deceleration (consistent with previous results). No clear relationship was found between global waves and type II radio bursts, electrons or protons detected in situ near Earth. While no relationship was found between the wave properties and the associated flare size (with waves produced by flares from B to X-class), more than a quarter of the active regions studied were found to produce more than one wave event. These results suggest that the presence of a global wave in a solar eruption is most likely determined by the structure and connectivity of the erupting active region and the surrounding quiet solar corona rather than by the amount of free energy available within the active region.

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Section: Introductionmentioning

confidence: 92%

A Statistical Analysis of the Solar Phenomena Associated with Global EUV Waves

et al. 2017

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“…Indeed, there has been indirect evidence for the existence of such large-scale traveling disturbances for a long time, including the apparent activation of distant filaments by flares (Dodson, 1949;Ramsey and Smith, 1966) and sympathetic flaring, where a flare seems to cause additional flares in a distant AR (Becker, 1958;Biesecker and Thompson, 2000). Less ambiguous evidence has come from type II radio bursts, first reported by Payne-Scott et al (1947) and Wild and McCready (1950), which were interpreted as signatures of an expanding coronal shock wave (Uchida, 1960). This interpretation is widely accepted.…”

Section: Overviewmentioning

confidence: 99%

“…Type II radio bursts (Payne-Scott et al, 1947;Wild and McCready, 1950) appear as slowly drifting bands of emission in dynamic radiospectra (see Figure 14a as an example). They are characteristic signatures of shock waves traveling outwards through the corona and IP space.…”

Section: Metric Type II Radio Burstsmentioning

confidence: 99%

Large-scale Globally Propagating Coronal Waves

Warmuth

2015

Living Rev. Sol. Phys.

169

140

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Large-scale, globally propagating wave-like disturbances have been observed in the solar chromosphere and by inference in the corona since the 1960s. However, detailed analysis of these phenomena has only been conducted since the late 1990s. This was prompted by the availability of high-cadence coronal imaging data from numerous spaced-based instruments, which routinely show spectacular globally propagating bright fronts. Coronal waves, as these perturbations are usually referred to, have now been observed in a wide range of spectral channels, yielding a wealth of information. Many findings have supported the "classical" interpretation of the disturbances: fast-mode MHD waves or shocks that are propagating in the solar corona. However, observations that seemed inconsistent with this picture have stimulated the development of alternative models in which "pseudo waves" are generated by magnetic reconfiguration in the framework of an expanding coronal mass ejection. This has resulted in a vigorous debate on the physical nature of these disturbances. This review focuses on demonstrating how the numerous observational findings of the last one and a half decades can be used to constrain our models of large-scale coronal waves, and how a coherent physical understanding of these disturbances is finally emerging. Article RevisionsLiving Reviews supports two ways of keeping its articles up-to-date:Fast-track revision. A fast-track revision provides the author with the opportunity to add short notices of current research results, trends and developments, or important publications to the article. A fast-track revision is refereed by the responsible subject editor. If an article has undergone a fast-track revision, a summary of changes will be listed here.Major update. A major update will include substantial changes and additions and is subject to full external refereeing. It is published with a new publication number.For detailed documentation of an article's evolution, please refer to the history document of the article's online version at http://dx

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“…These bursts were first recognized from records made simultaneously at a number of discrete frequencies (Payne-Scott, Yabsley, and Bolton 1947), and were later studied with a dynamic spectrum analyser (Wild and McCready 1950;Wild 1950). Wild and McCready introduced the designation spectral type II for the bursts.…”

Section: Introductionmentioning

confidence: 99%

Solar Radio Bursts of Spectral Type II

Roberts¹

1959

Aust. J. Phys.

177

104

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The characteristics of bursts of spectral type II are studied in a sample of 65 bursts. Approximately half the bursts show harmonic structure and about half are compound type III-type II events. Band splitting, the doubling of both the fundamental and second harmonic bands, is also relatively common. A rather less common feature is the appearance of herring-bone structure in which the slowly drifting band of the type II burst appears to be a source from which rapidly drifting elements diverge towards lower and higher frequencies.Statistics are given of the rate of occurrence of the bursts, their frequency range, the rate of frequency drift, and the harmonic ratio There is a greater tendency for the geomagnetic field to be disturbed in the few days following a type II burst than there is after large flares which are not accompanied by type II bursts, or after large radio bursts of spectral type III. Statistically the greatest disturbance occurs after about two days, implying a mean speed of travel of about 1000 km/sec.

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Relative Times of Arrival of Bursts of Solar Noise on Different Radio Frequencies

Cited by 163 publications

References 2 publications

A Statistical Analysis of the Solar Phenomena Associated with Global EUV Waves

A Statistical Analysis of the Solar Phenomena Associated with Global EUV Waves

Large-scale Globally Propagating Coronal Waves

Solar Radio Bursts of Spectral Type II

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