![]() Cahill, Inflation of the inner magnetosphere during a magnetic storm, J. Raja Rao, On the D st field in the equatorial electrojet region, J. Chapman, On the asymmetric development of magnetic storm fields in low and middle latitudes Planet. ![]() When the Sun is at a right angle to the Moon, moderate tides, called neap tides, result. Raja Rao, On the seasonal variation in lunar and solar geomagnetic tides in the geomagnetic equatorial region, J. Twice a month, when the Earth, Sun, and Moon line up, their gravitational power combines to make exceptionally high tides, called spring tides, as well as very low tides where the water has been displaced. Chapman, The detection of lunar daily geophysical variations by the Chapman-Miller method, Geophys. Malin, Lunar and solar daily variations of the geomagnetic field at Watheroo, Western Australia, J. Miller, Statistical determination of lunar daily variations in geophysical data, Mon. Black, Lunar and solar magnetic variations at Abinger their detection and estimation by spectral analysis, viz. Rao, Lunar and solar geomagnetic tides in declination at Alibag, J. But if both K p and R are increasing, when K p increases enhancement due to R decreases and when R increases enhancement due to K p decreases. The results show that the amplitude at zero sunspot number increases with magnetic activity in all the four parameters, while the enhancement due to sunspot activity at different levels of magnetic activity decreases with increase of K p. The enhancements in amplitudes L 2 and S 1 in H and D, due to sunspot activity and due to magnetic activity, have been separated. A lunar or solar eclipse can occur only when the Moon is in syzygy. Tides are greatest when the Moon is at perigee and Earth is at perihelion. Tides are greatest when the Moon is at apogee and Earth is at aphelion. But it’s a distant gorilla, about 390 times farther away than the Moon, which gives it a little less than half of the Moon’s tide-generating force. It is inferred that there is a local time component of the storm time variation contrary to the view expressed by Green and Malin. Neap tides result from destructive interference between the solar and lunar tidal bulges. The Sun with about 27 million times the mass of the Moon is always the gorilla in the room when it comes to solar system equations. Surprisingly, the enhancement due to magnetic activity is greater in L 2(H) than in S 1(H), while the contrary is true for declination. In both H and D the enhancement due to sunspot activity is larger in lunar tide than in solar tide. The seasonal variation in L 2(H) is opposite to that in L 2(D) with maximum in the d season and minimum in the j season. Solar and lunar geomagnetic tides in H at Alibag have been determined by spectral analysis of discrete Fourier transforms following the method of Black and the well-known Chapman-Miller method.
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