Search Results - (Author, Cooperation:W. A. Coles)
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1Latest Papers from Table of Contents or Articles in PressR. M. Shannon ; V. Ravi ; W. A. Coles ; G. Hobbs ; M. J. Keith ; R. N. Manchester ; J. S. Wyithe ; M. Bailes ; N. D. Bhat ; S. Burke-Spolaor ; J. Khoo ; Y. Levin ; S. Oslowski ; J. M. Sarkissian ; W. van Straten ; J. P. Verbiest ; J. B. Wang
American Association for the Advancement of Science (AAAS)
Published 2013Staff ViewPublication Date: 2013-10-19Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
2Latest Papers from Table of Contents or Articles in PressR. M. Shannon ; V. Ravi ; L. T. Lentati ; P. D. Lasky ; G. Hobbs ; M. Kerr ; R. N. Manchester ; W. A. Coles ; Y. Levin ; M. Bailes ; N. D. Bhat ; S. Burke-Spolaor ; S. Dai ; M. J. Keith ; S. Oslowski ; D. J. Reardon ; W. van Straten ; L. Toomey ; J. B. Wang ; L. Wen ; J. S. Wyithe ; X. J. Zhu
American Association for the Advancement of Science (AAAS)
Published 2015Staff ViewPublication Date: 2015-09-26Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
3Articles: DFG German National LicensesColes, W. A. ; Rickett, B. J. ; Rumsey, V. H. ; Kaufman, J. J. ; Turley, D. G. ; Ananthakrishnan, S. ; Armstrong, J. W. ; Harmons, J. K. ; Scott, S. L. ; Sime, D. G.
[s.l.] : Nature Publishing Group
Published 1980Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] The solar wind also shows the effects of the solar cycle, but changes observed by ecliptic spacecraft are minor compared with the dramatic changes observed in the corona for example. Two processes are apparent in the observations of 1962-74 (rf. 7). First, at sunspot maximum, there is an increase ...Type of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesGrail, R. R. ; Coles, W. A. ; Klinglesmith, M. T. ; Breen, A. R. ; Williams, P. J. S. ; Markkanen, Jussi ; Esser, Ruth
[s.l.] : Nature Publishing Group
Published 1996Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] In a radio-scattering observation, fluctuations in the electron density act as a flow tracer6. They cause refractive-index fluctuations that phase-modulate the radio wave from a distant source, such as a quasar, as it passes near the Sun. Diffraction converts this phase modulation to intensity ...Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Observations of dynamic spectra over a wide range require an unusual spectrometer and have been reported only by Cole and Slee2; they observed IPS of the source 3C273 using an acousto-optical spectrograph on the Parkes telescope to cover a band of 280-520 MHz. At the time of these observations ...Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesBreen, A. R. ; Moran, P. J. ; Varley, C. A. ; Wilkinson, W. P. ; Williams, P. J. S. ; Coles, W. A. ; Lecinski, A. ; Markkanen, J.
Springer
Published 1998Staff ViewISSN: 0992-7689Keywords: EISCAT ; Interplanetary scintillation ; Solar WindSource: Springer Online Journal Archives 1860-2000Topics: GeosciencesPhysicsNotes: Abstract Co-rotating interaction regions (CIRs) between fast and slow streams of plasma are a prominent feature of the solar wind. Measurements of interplanetary scintillation (IPS) using the three widely separated antennas of the EISCAT facility have been used to detect the compression regions at the leading edges of interaction regions and to determine the location and velocity of the structure. Observations show that interaction regions have developed as close to the Sun as 25–30 solar radii, a result supported by theoretical modelling which shows that the conditions needed for CIRs to develop exist inside 30 solar radii.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesBreen, A. R. ; Coles, W. A. ; Grail, R. R. ; Klinglesmith, M. T. ; Markkanen, J. ; Moran, P. J. ; Tegid, B. ; Williams, P. J. S.
Springer
Published 1997Staff ViewISSN: 0992-7689Source: Springer Online Journal Archives 1860-2000Topics: GeosciencesPhysicsNotes: Abstract EISCAT observations of interplanetary scintillation have been used to measure the velocity of the solar wind at distances between 15 and 130R⊙ (solar radii) from the Sun. The results show that the solar wind consists of two distinct components, a fast stream with a velocity of ∼ 800 km s−1 and a slow stream at ∼ 400 kms−1. The fast stream appears to reach its final velocity much closer to the Sun than expected. The results presented here suggest that this is also true for the slow solar wind. Away from interaction regions the flow vector of the solar wind is purely radial to the Sun. Observations have been made of fast wind/slow wind interactions which show enhanced levels of scintillation in compression regions.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 1572-946XKeywords: solar wind ; plasma ; interplanetary scintillationSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract Until the ULYSSES spacecraft reached high latitude, the only means for measuring the solar wind velocity in the polar regions was from radio scattering observations (IPS), and these remain the only way to measure the velocity near the sun. However, IPS, like many remote sensing observations, is a “line-of-sight” integrated measurement. This integration is particularly troublesome when the line-of-sight passes through a fast stream but that stream does not occupy the entire scattering region. Observations from the HELIOS spacecraft have shown that the solar wind has a bimodal character which becomes more pronounced near the sun. Recent observations from ULYSSES have confirmed that this structure is clear at high latitudes even at relatively large solar distances. We have developed a method of separating the fast and slow contributions to an IPS observation which takes advantage of this bimodal structure. In this paper I will describe the technique and its application to IPS observations made using the receiving antennas of the EISCAT incoherent backscatter radar observatory in northern Scandinavia.Type of Medium: Electronic ResourceURL: