Advances in solar radio astronomy

Kundu, M. R.

doi:10.1088/0034-4885/45/12/002

Cited by 34 publications

(20 citation statements)

References 223 publications

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“…These "seed" results and subsequent findings gave rise to a new branch of solar physics that is presently known as solar radiophysics. The rich scientific content and exciting research in solar radiophysics have been summarized in a number of monographs and review articles [4][5][6][7][8][9]. These works describe many fascinating and intriguing phenomena that portray the complexity of the subject, and most of the observations remain unexplained.…”

Section: Citationmentioning

confidence: 99%

On theories of solar type III radio bursts

2012

Chin. Sci. Bull.

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In solar radiophysics, many theories for type III bursts have been proposed during the past 60 years. Almost all these theories are based on the plasma hypothesis, which assumes that (i) the radiation is mainly generated by Langmuir waves via nonlinear processes and (ii) the radiation has frequencies close to the local plasma frequency and/or its second harmonic in the source region. We feel strongly that it is time to advocate an alternative approach without recourse to the plasma hypothesis. This brief discussion explains why. solar radiophysics, type III bursts, plasma hypothesis, electron cyclotron maser mechanism Citation:Wu C S. On theories of solar type III radio bursts. Chin Sci Bull, 2012Bull, , 57: 1357Bull, -1361Bull, , doi: 10.1007 Several groundbreaking papers [1-3] reported surprising observational results in the field of solar radiophysics in 1950. These "seed" results and subsequent findings gave rise to a new branch of solar physics that is presently known as solar radiophysics. The rich scientific content and exciting research in solar radiophysics have been summarized in a number of monographs and review articles [4][5][6][7][8][9]. These works describe many fascinating and intriguing phenomena that portray the complexity of the subject, and most of the observations remain unexplained. There are a number of fundamental difficulties in explaining the phenomena. First, physical processes in the solar atmosphere cannot be directly measured through in-situ observations. As a result, discussions generally rely on inferences and hypotheses. Second, it often happens that theoretical explanations are not unique. Third, understanding induced radiation processes relevant to solar radiophysics is an immature topic in plasma physics. Fourth, there could be new plasma processes that are peculiar to the solar atmosphere but of which we have little knowledge. We hope that researchers will make breakthroughs that will explain the phenomena. What we need imminently are innovative ideas. Most theories in solar radiophysics are concerned with type III bursts, which are considered later in this paper. Yet, for historical and traditional reasons, most of these discussions impose the plasma hypothesis, which is defined in the next section. The purpose of the present discussion is two-fold. First, we state that the plasma hypothesis is not proven, and second, we make general comments on existing theories.The paper is organized as follows. Section 1 outlines the important observational results of type III radio bursts. Section 2 outlines the traditional approach in which enhanced Langmuir waves are thought to play deterministic roles. Motivated by an outstanding issue that was raised by observations made in the 1970s, we present a scenario of type III bursts that is based on a totally different notion in Section 3. Section 4 presents concluding remarks and a summary.

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Section: Citationmentioning

confidence: 99%

On theories of solar type III radio bursts

2012

Chin. Sci. Bull.

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“…The rapid progress toward an understanding of the emission processes in coronal structures above active regions has been greatly stimulated by the application of supersynthesis arrays to solar observations (see review by Kundu 1982).…”

Section: E Radio Emissionmentioning

confidence: 99%

VII. Active Regions: Structure and Evolution

Galzauskas¹

1985

Trans. Int. Astron. Union

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The corona above active regions is now recognized as an assemblage of magnetically confined loops of plasma. This advance in understanding the active upper atmosphere is documented in the monograph resulting from the Third Skylab Workshop (Solar Active Regions, 1981, ed., F.Q. Orrall). International collaborative programs during the Solar Maximum Year (SMY) have further stimulated the study of active regions with emphasis on the search for the underlying causes of solar flares. Scores of analyses of individual regions, combining space- and ground-based observations, have been published. We have as a result an improved picture of interactions between active regions: from creation of shear in the magnetic topology to inter-region connections via the corona. A revived interest in the phenomena of recurrent active regions and sunspot decay has highlighted a basic problem for solar magnetism: the removal of magnetic flux from the solar surface. The interpretation of temporary dips in the solar irradiance caused by active regions continues to generate lively debate.

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“…on time intervals as short as 3.3 seconds has now shown that these increases are associated with changes in the coronal magnetic field and with preburst heating in coronal loops. (Kundu 1982Willson, 1983.…”

Section: )mentioning

confidence: 99%

Very Large Array Observations of Coronal Loops and Related Observations of Solar Type Stars.

Lang¹

1984

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Advances in solar radio astronomy

Cited by 34 publications

References 223 publications

On theories of solar type III radio bursts

On theories of solar type III radio bursts

VII. Active Regions: Structure and Evolution

Very Large Array Observations of Coronal Loops and Related Observations of Solar Type Stars.

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