|
Volume : III, Issue : XI, December - 2013 Oscillations With Periods Outside The Micropulsation Range, V arious Auroral Zone And Typical Micropulsation Period Bands Hanumantha Raju N DOI : 10.9780/22307850, Published By : Laxmi Book Publication Abstract : Conspicuous micropulsations in the auroral zones with periods fr om 0.03 to 10 seconds have been
studied using data obtained by the Pacific Naval Laboratory and Stanford University during January 1961. For
periods less than 0.3 second bursts of oscillations fr equently occur superimposed on the background level of ELF
noise. These bursts are considered to be of extra-atmospheric origin because of their conjugate relationships. For
periods between 0.3 and 10 seconds four typical classes are defined: (1) Burstlike micropulsations, with quite a
wide range of fr equencies, which appear at the onset of a polar storm or bay (noise burst). (2) Pearl, beating-type
micropulsations, occurring intermittently so that they form separate bunches (PP). (3) Continuous
micropulsations, typically found in the for enoon, with periods fr om 0.3 to 3 seconds (CPsp). (4) Continuous
micropulsations, typically found in the afternoon, with periods fr om 3 to 10 seconds (CPlp). Not every polar storm
or bay is accompanied by noise bursts. Noise bursts are found only at the onset of polar storms or bays occurring
around or before local midnight. Separate bunches of pearl, beating-type micropulsations are attributed to a
bouncing agent whose bouncing period of a few minutes can be determined fr om the time lag of their occurrences in
conjugate areas. Keywords : Article : Cite This Article : Hanumantha Raju N, (2013). Oscillations With Periods Outside The Micropulsation Range, V arious Auroral Zone And Typical Micropulsation Period Bands. Indian Streams Research Journal, Vol. III, Issue. XI, DOI : 10.9780/22307850, http://oldisrj.lbp.world/UploadedData/3362.pdf References : - Carpenter, D. L., Direct detection by a whistler method of the magnetospheric electric fieldassociated with a polar substorm, Planetary Space Sci., 15, 395, 1967.
- Dungey , J. W., Interactions of solar plasma with the geomagnetic field, Planetary Space Sci., 10,233, 1963.
- Ehmert, A., G. Kremser, G. Pfotzer, K. H. Sarger, K. Wilhelm, W. Rideler, A. Brewersdorfi J.P .Legrand, M. Palous, J. Oksman, and P . T anskanen, Simultaneous measurements of auroral X-rays at Kiruna (Sweden) and Ivalo/Sodankyla (Finland) from July to September, 1965, Sparmo Bull. 2, 19'66
- Fairfield, D. H., and L. J. Cahill, Transition region magnetic field and polar magnetic disturbances, J. Geophys. Res., 71, 155, 1966.
- Heppner, J.P ., M. Sugiura, T . L. Skillman, B. G.Ledley, and M. Campbell, OGO-A Magnetic field observations, Goddard Space Flight Centerpubl. X-612 67-150, 1967
- Jelley , D. H., and N. Brice, Association between increased radiation in the outer belt and polar auroral substorms (abstract), Trans. Am. Geophys. Union, 48, 180, 1967
- Levy , R. H., H. E. Petschek, and G. L. Siscoe, Aerodynamic aspects of the magnetospheric flow, AIAAJ., 2, 12; 1964
- Campbell, W. l:I., and E. C. Stiltner, Some characteristics of geomagnetic pulsations at frequencies near I c/s, Radio Sci., 69D(8), 1117-1132,1964
- Cornwall, J. M., Cyclotron instabilities and electro magnetic emission in the ultra low frequency and very low frequency ranges, J. Geophys. R es., 70(1), 61-69, 1965
- Greifinger, D., and P . Greifinger, Transmission of micropulsations through the lower ionosphere, J. Geophys. Res., 70(9), 2217-2231, 1965
- Heacock, R. R. , Aur or al - zone t el l ur i c cur r ent micropulsations, T ≤ 20 seconds, J. Geophys.Res., 68(7), 1871-1884, 1963
- Heacock, R. R. , and V . P . Hessler, Pearl-type micropulsations associated with magnetic storm sudden commencements, J. Geophys. Res., 70(5), 1103-1111, 1965.
- Hessler, V . P ., editor, High Latitude Geophysical Data, January-December 1964, Geophysical Institute, University of Alaska, Reports V AG-C-(35-38), 1964
- acobs , J . A. , and E. J . Jol l ey, Geomagnet m micropulsations with periods 0.3-3 seconds (pearls),Nature, 194, 641-643, 1962
|
Article Post Production
Article Indexed In
|