Solar Oscillations

The whole Sun is ringing like a bell with periods for its complex vibrations of a few minutes. The changes in the Sun's shape and the resulting velocity patterns on its surface are, however, very tiny. Their study therefore requires very sophisticated techniques. The resonance scattering spectrometer works by passing a solar spectrum line originating from potassium or sodium through a hot vapour of the same element. The solar light is circularly polarised, and a similar polarisation is induced...

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The Carrington rotation dumber for dates other than those given directly in Table 5,2, However there are slight variations in the rotational periods obtained, depending upon the methods used to measure them, Thus at a latitude of 45 , sunspots suggest a rotation period of 28.1 days, while prominences and filaments suggest 27,3 days. This presumably arises through the intrinsic motions of sun spots and or prominences across the solar surface, and so there is still some uncertainty in the exact...

Solar Rotation

The Sun is not a solid object and does not rotate like one. The rotational period varies significantly with latitude* by small amounts with time, and may be quite different between the interior and surface. At the equator the rotational period is 24.9 days, It increases away from the equator until near the poles it may be as much as 35 or 40 days. An empirical relationship which gives a good fit for most latitudes is Solar rotation period 24,9 0.0188 0 + Q.OO2l60 days where is the solar...

Limb Darkening Granulation and

Sunspots are easily seen, indeed, they are sometimes visible to the unaided eye (although for such observations Material chroniony prawem auto is k m Magnetic polarities ihrouejKout one sun spot cycle Magnetic pdaritias throughout fhe next (or previous) sunspot cyde Magnetic polarities ihrouejKout one sun spot cycle Magnetic pdaritias throughout fhe next (or previous) sunspot cyde filters, etc., still need lo be used - see Chapter 6). Several Figure 1.8. Magnetic other features of the Sun can...

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2AT C -tROMGSP u UIC 3V2 .r or 197.6J F1 Baily's beads during the total eclipse on 26 February 1998. Obtained at Aruba on Fujichrome Sensia 100 slide film using a Questar 88 mm telescope directly attached to an Olympus OM2S camera body and with a full aperture filter. Reproduced by courtesy of Jack Morris. E6 The development of a spectacular prominence over a period of 4 hours on 22 August 1976. A series of drawings made using a prominence spectroscope on a 71 mm telescope. Reproduced by...