Abstract
A unique night-time natural electromagnetic disturbances in the VLF/ELF range received during a magnetically quite period at a low latitude Indian ground station, Jammu (geomag. lat. 19°26′ N, L=1.17) has been reported. During the routine observation of VLF waves at Jammu, whistlers and different types of VLF/ELF emissions such as whistlers of varying dispersion confined to a small band limited frequency range, hisslers, pulsing hiss, discrete chorus emissions of rising and falling tones with multiple bands, oscillating tone discrete emission, whistler-triggered hook and discrete chorus risers emissions, etc. have been observed simultaneously during the quiet period on a single night. Such type of unique simultaneous observations has never been reported from any of the low latitude ground stations and this is the first observation of its kind. The results are discussed in the light of recorded features of whistlers and emissions. Generation and propagation mechanism are discussed briefly. Plasma parameters are further derived from the dispersion analysis of nighttime whistlers and emissions recorded simultaneously during magnetically quiet periods.
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References
Andrews, M.K.: Night time radial plasma drifts and coupling fluxes at L=2.3 from whistler mode measurements. Planet Space Sci. 28, 407–417 (1980)
Andrews, M.K., Knox, F.B., Thomson, N.R.: Magnetospheric electric fields and protonospheric coupling fluxes inferred from simultaneous phase and group path measurements on whistler mode signals. Planet Space Sci. 26, 171–183 (1978)
Angerami, J.J.: A whistler study of the distribution of thermal electron in the magnetosphere, SEL-66-017, Radio Sci. Lab., Stanford University, Stanford, California, USA (1966)
Block, L.P., Carpenter, D.L.: Derivation of magnetospheric electric fields from whistler data in a dynamic geomagnetic field. J. Geophys. Res. 79, 2783–2789 (1974)
Carpenter, D.L.: New whistler evidence of a dynamo origin of electric fields. J. Geophys. Res. 83, 1558–1564 (1978)
Carpenter, D.L., Stone, K.: Direct detection by a whistler method of the magnetospheric electric field associated with a polar sub storm. Planet Space Sci. 15, 395–397 (1967)
Carpenter, D.L., Akasofu, S.I.: Two substorm studies of relations between west ward electric fields in the outer plasmasphere, auroral activity and geomagnetic perturbations. J. Geophys. Res. 77, 6854–6863 (1972)
Carpenter, D.L., Seely, N.T.: Cross-L plasma drifts in the outer plasma sphere – Quiet time patterns and some substorm effects. J. Geophys. Res. 81, 2728–2736 (1976)
Carpenter, D.L., Stone, K., Siren, J.C., Crystal, T.L.: Magnetospheric electric field deduced from drifting whistler path. J. Geophys. Res. 77, 2819–2836 (1972)
Cole, K.D.: Formation of field aligned irregularities in the magnetosphere. J. Atmos. Terr. Phys. 33, 741–746 (1971)
Corcuff, P., Corcuff, Y.: Structure of dynamique de la plasmapause-plasmasphere les 6 et Juliet 1977 etude a l’aide des donneees des sifflements secus an sol et des donnees des satellite ISIS et Geos–1. Ann. Geophys. 38, 1–24 (1982)
Dowden, R.L., Allcock, G.M.: Determination of nose frequency of non-nose whistlers. J. Atmos. Terr. Phys. 33, 1125–1129 (1971)
Guthart, H.: Nose whistlers dispersion as a measure of magnetosphere electron temperature. Radio Sci. 69D, 1417–1424 (1965)
Hayakawa, M., Tanaka, Y., Ohtsu, J.: On the morphologies of low latitude and auroral VLF hiss. J. Atmos. Terr. Phys. 37, 517–519 (1975)
Hayakawa, M., Hattori, Yoshiaki, A.: Natural electromagnetic phenomena and electromagnetic theory: a review. IEES Trans. FM 124, 72–79 (2004)
Helliwell, R.A.: Whistler and Related Ionospheric Phenomena. Stanford Univ., Stanford (1965)
Helliwell, R.A.: A theory of discrete emissions from the magnetosphere. J. Geophys. Res. 72, 4773–4790 (1967)
Ho, D., Bernard, L.C.: A fast method to determine the nose frequency and minimum group delay of whistlers when the causative spheric is unknown. J. Atmos. Terr. Phys. 35, 881–887 (1973)
Karpman, V.I., Istomin, J.N., Shklyar, D.Y.: Non linear theory of a quasi monochromatic whistler mode packet in an inhomogeneous plasma. Phys. Plasma 16, 685–693 (1974)
Khosa, P.N., Lalmani, Rausaria, R.R., Ahmad, M.M.: Whistler and VLF hiss recorded at Srinagar. Indian J. Radio Space Phys. 10, 209–210 (1981)
Khosa, P.N., Ahmad, M.M., Lalmani: Whistler observation of magnetospheric electric field in the night side plasmasphere at low latitudes. Moon Planets 27, 453–462 (1982)
Khosa, P.N., Lalmani, Kishen, K.: An analysis of low latitude whistlers observed at Nanital Indian J. Phys. 64, 34–41 (1990)
Lalmani: Some aspects of whistler duct lifetimes at low latitudes. J. Geophys. 56, 53–57 (1984)
Lalmani, Ahmad, A., Ahmad, M.M.: Ionosphere plasmasphere coupling electron fluxes from low latitudes whistler studies at Nainital, during geomagnetic storm. Planet Space Sci. 40, 1409–1418 (1992)
Lalmani, Singh, R.P., Singh, R., Ahmad, A.: Whistler observation of quiet time plasmasphere ionosphere coupling fluxes at low latitude. Earth Moon Planets 74, 7–15 (1996)
Lalmani, Babu, M.K., Kumar, R., Singh, R., Gwal, A.K.: Extremely small dispersion whistlers and VLF emissions recorded during day time at Jammu. Indian J. Radio Space Phys. 28, 216–220 (1999)
Lalmani, Babu, M.K., Kumar, R., Singh, R., Gwal, A.K.: An explanation of discrete VLF emissions observed at Jammu (L=1.17) and determination of magnetospheric parameters. Indian J. Phys. 74B(2), 117–123 (2000)
Lester, M., Smith, A.J.: A whistler study of the bulge region of the plasmapause. Mem. Nat. Inst. Polar Res. 16, 113–127 (1980)
Mathur, A., Rycroft, M.J.: Electron density profiles deduced from the plasmapause whistlers observed in the United Kingdom. J. Geophys. Res. 77, 1982–1986 (1972)
Mishra, K.D., Lalmani, Singh, B.D.: Magnetospheric electric field from low latitude whistlers during magnetic storm. Planet Space Sci. 28, 449–452 (1980)
Molvig, K., Hilfer, G., Miller, R.H., Myczkowski, J.: Self-consistent theory of triggered whistler emissions. J. Geophys. Res. 93, 5665–5676 (1988)
Nunn, D., Omura, Y., Matsumoto, H., Nagano, I., Yagitani, S.: The numerical simulation of VLF chorus and discrete emissions observed on the Geotail satellite using a Vlasov code. J. Geophys. Res. 102, 27083 (1997)
Okuzawa, T., Yamanaka, K., Yoshino, T.: Characteristics of low latitude whistler propagations associated with magnetic storms, in March, 1970. Rep. Ionos. Space Res. Jpn. 25, 17 (1971)
Omura, Y., Nunn, D., Matsumoto, H., Rycroft, M.J.: A review of observational theoretical and numerical studies of VLF triggered emissions. J. Atmos. Terr. Phys. 53, 351 (1991)
Park, C.G.: Method of determining electron concentration in the magnetosphere from the whistlers. Tech. Report, Stanford University, California (1972)
Park, C.G.: Whistler observation of the depletion of the plasmasphere during a magnetic substorm. J. Geophys. Res. 78, 672–683 (1973)
Park, C.G.: Substorm electric field in the evening plasmasphere and their effect on the underlying F-layer. J. Geophys. Res. 81, 2283–2288 (1976)
Park, C.G.: Whistler observation of substorm electric fields in the night side plasmasphere. J. Geophys. Res. 83, 5773–5777 (1978)
Park, C.G., Carpenter, D.L.: Whistler evidence of large scale electron density irregularities in the plasmasphere. J. Geophys. Res. 5, 3825–3836 (1970)
Park, C.G., Helliwell, R.A.: The formation of electric fields of field aligned irregularities in the magnetosphere. Radio Sci. 6, 299–304 (1971)
Park, C.G., Carpenter, D.L., Wiggin, D.B.: Electron density in the plasmasphere: whistler data on solar cycle, annual and diurnal variations. J. Geophys. Res. 83, 3137–3144 (1978)
Ralchovski, T.M.: Electron concentration at L=1.8 obtained from whistler measurements. C. R. Acad. Bulg. Sci. 29, 351–352 (1976)
Ralchovski, T.M.: Electric field in the inner plasmasphere obtained from whistler day time observation. Rep. Bulg. Acad. Sci. 34, 1503–1504 (1981)
Rao, M., Lalmani: An evaluation of duct lifetimes from low latitude ground observations of whistlers. Planet. Space Sci. 23, 923–927 (1975)
Rash, J.P.S., Hansen, H.J., Scourfield, M.W.J.: Electric field sources in the quiet plasmasphere from whistler observations. J. Atmos. Terr. Phys. 48, 399–414 (1986)
Rycroft, M.J.: Enhanced energetic electron intensities at 100 km altitude and a whistler propagating through the plasmasphere. Planet. Space Sci. 21, 239–251 (1973)
Rycroft, M.J.: Whistlers and discrete ELF/VLF emissions. In: Holtet, J. (ed.) The ELF–VLF Radio Wave Propagation, pp. 317–334. Reidel, Holland (1974)
Rycroft, M.J., Mathur, A.: The determination of the minimum group delay of a non-nose whistler. J. Atmos. Terr. Phys. 35, 2177–2182 (1973)
Sagredo, J.L., Smith, I.D., Bullough, K.: The determination of whistler nose frequency and minimum delay and implication for measurements of the east-west electric field and tube content in the magnetosphere. J. Atmos. Terr. Phys. 35, 2035–2046 (1973)
Saxton, J.M., Smith, A.J.: Quiet time plasmaspheric electric fields and plasmasphere, ionosphere coupling fluxes at L=2.5. Planet. Space Sci. 37, 283–293 (1989)
Sazhin, S.S., Smith, A.J., Sazhin, E.M.: Can magnetospheric temperature be inferred from whistler dispersion measurements. Ann. Geophys. 8, 237–285 (1990)
Sazhin, S.S., Hayakawa, M., Bullough, K.: Whistler diagnostic of magnetospheric parameters: a review. Ann. Geophys. 10, 293–308 (1992)
Sazhin, S.S., Bognar, P., Smith, A.J., Tarcsai, G.: Magnetospheric electron temperatures inferred from whistler dispersion measurements. Ann. Geophys. 11, 619–623 (1993)
Scarf, F.L.: Landau damping and the attenuation of whistlers. Phys. Fluids 5, 6–13 (1962)
Singh, R.P.: Whistler studies at low latitudes: a review. Indian J. Radio Space Phys. 22, 139–155 (1993)
Singh, A.K.: The study of inner magnetosphere by VLF waves. Ph.D. Thesis, Banaras Hindu University, India (1995)
Singh, B., Prakash, R., Singh, H.: Discrete chorus emissions observed at a low latitude station. Nature (London) 290, 37–39 (1981)
Singh, U.P., Singh, A.K., Lalmani, Singh, R.P., Singh, R.N.: Hybrid-mode propagation of whistler at low latitudes. Indian J. Radio Space Phys. 21, 246–249 (1992)
Singh, R.P., Lalmani, Singh, U.P.: Electron density distribution derived from low latitude whistler studies. Ann. Geophys. 11, 1011–1017 (1993)
Singh, U.P., Singh, R.P.: Study of plasmasphere ionosphere coupling fluxes. J. Atmos. Sol.-Terr. Phys. 59, 1321–1327 (1997)
Singh, R.P., Singh, A.K., Singh, D.K.: Plasmaspheric parameters as determined from whistler spectrogram: a review. J. Atmos. Sol.-Terr. Phys. 60, 495–508 (1998)
Singh, R.P., Singh, D.K., Singh, A.K., Hamar, D., Lichtenberger, J.: Application of matched filtering and parameter estimation technique to low latitude whistlers. J. Atmos. Sol.-Terr. Phys. 61, 1081–1089 (1999)
Singh, R.P., Patel, R.P., Singh, D.K.: Triggered emissions observed at Varanasi. Planet. Space Sci. 51, 495–530 (2003)
Singh, K.K., Singh, R., Singh, R.P., Shyampati: Hisslers: Quasi-periodic VLF noise forms observed at low latitude ground station Jammu (L=1.17). Geophys. Res. Lett. 31, L19802 (2004a). doi:10.1029/2004GL020468
Singh, R.P., Singh, R., Lalmani, Hamar, D., Lichtenberger, J.: Application of matched filtering to short whistlers recorded at low latitudes. J. Atmos. Sol.-Terr. Phys. 66, 407–413 (2004b)
Singh, K.K., Patel, R.P., Singh, J., Kumar, B., Singh, A.K., Singh, R.P., Koul, B.L., Lalmani: Observation of unusual whistler during daytime at Jammu. J. Earth Syst. Sci. 117, 1–7 (2008)
Singh, K.K., Patel, R.P., Kumar, B., Altaf, M., Ganai, P.A., Singh, A.K., Singh, R.P., Lalmani: Hisslers observed during day time in a low latitude ground station. Acta Geophys. 57, 536–547 (2009). doi:10.2478/s11600-008-0078-Y
Smith, R.L.: The use of nose whistlers in the study of outer ionosphere. Tech. Rept. No. 6, AFOSR-TN-60-861, Radio Science Lab, Stanford University, Stanford, California (1960)
Smith, R.L.: Propagation characteristics of whistlers trapped in field aligned columns of enhanced ionization. J. Geophys. Res. 66, 3699 (1961)
Smith, R.L., Carpenter, D.L.: Extension of nose whistler analysis. J. Geophys. Res. 66, 2582–2586 (1961)
Somayajulu, V.V., Tantry, B.A.P.: Effect of magnetic storm on duct formation for whistler propagation. J. Geomagn. Geoelectr. 20, 21–31 (1968)
Tanaka, Y., Hayakawa, M.: The effect of geomagnetic disturbances on the duct propagation of low latitude whistlers. J. Atmos. Terr. Phys. 35, 423–430 (1973)
Tarcsai, G.: Routine whistler analysis by means of accurate curve fitting. J. Atmos. Terr. Phys. 37, 1447–1457 (1975)
Tarcsai, G., Szemeredy, P., Hegymegi, L.: Average electron density profiles in the plasmasphere between L=1.4 and 3.2 deduced from whistlers. J. Atmos. Terr. Phys. 50, 607–661 (1988)
Tarcsai, G., Strangeways, H.J., Rycroft, M.J.: Error sources and travel time residuals in plasmaspheric whistler interpretation. J. Atmos. Terr. Phys. 51, 249–258 (1989)
Thomson, R.J.: The formation and life time of whistler ducts. Planet. Space Sci. 26, 423–430 (1978)
Trakhtengerts, V.Y., Rycroft, M.J.: Whistler-electron interaction in the magnetosphere: new results and novel approaches. J. Atmos. Sol.-Terr. Phys. 62, 1719 (2000)
Wang, C.S., Kim, J.S.: The effect of an electric field induced by a time-dependent ring current on the particle drift motion. Planet. Space Sci. 20, 2039–2044 (1972)
Walker, A.D.M.: Formation of whistler ducts. Planet. Space Sci. 26, 375–379 (1978)
Yoshida, T., Ohtsu, J., Hayakawa, M.: A study of the mechanism of whistler-triggered VLF emissions. J. Geophys. Res. 53, 69 (1983)
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Singh, A.K., Singh, K.K., Singh, A.K. et al. Simultaneous observation of whistlers and emissions during a geomagnetically quiet period at low latitude. Astrophys Space Sci 331, 459–468 (2011). https://doi.org/10.1007/s10509-010-0465-0
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DOI: https://doi.org/10.1007/s10509-010-0465-0