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Occurrence of sporadic-E layer over the ionospheric station of Rome: Analysis of data for thirty-two years
Language
English
Obiettivo Specifico
3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
1 / 44 ( 2009 )
Publisher
Elsevier Ltd
Pages (printed)
72 - 81
Issued date
July 1, 2009
Abstract
Hourly systematic measurements of the highest frequency reflected by the sporadic-E layer (foEs) recorded at the Rome ionospheric observatory (Italy, 41.8° N, 12.5° E), were considered during the period January 1976–December 2007, to calculate the percentage of occurrence of sporadic-E layer with frequencies foEs greater than a given threshold value fT, P(foEs > fT).
To study possible influences from solar activity, measurements of foEs recorded near the periods of minimum and maximum solar
activity, were also considered. Measurements of foEs recorded for the period January 2000–December 2007 were analysed to study
the influence of magnetic activity on foEs occurrence frequency. The results are provided as maps showing P(foEs > fT) with foEs above the selected level (fT=3, 4, 5, 6, 7, 8, and 9 MHz), for each hour from 00.00 L.T. to 23.00 L.T. and for each month.
The results reveal a relatively low P(foEs > fT) before sunrise and after sunset in all seasons; the most significant P(foEs > fT) occur during daytime in summer months; intense formations of sporadic-E layer occur rarely during the year; P(foEs > fT) does not depend significantly on solar and geomagnetic activity.
2009 COSPAR. Published by Elsevier Ltd. All rights reserved.
To study possible influences from solar activity, measurements of foEs recorded near the periods of minimum and maximum solar
activity, were also considered. Measurements of foEs recorded for the period January 2000–December 2007 were analysed to study
the influence of magnetic activity on foEs occurrence frequency. The results are provided as maps showing P(foEs > fT) with foEs above the selected level (fT=3, 4, 5, 6, 7, 8, and 9 MHz), for each hour from 00.00 L.T. to 23.00 L.T. and for each month.
The results reveal a relatively low P(foEs > fT) before sunrise and after sunset in all seasons; the most significant P(foEs > fT) occur during daytime in summer months; intense formations of sporadic-E layer occur rarely during the year; P(foEs > fT) does not depend significantly on solar and geomagnetic activity.
2009 COSPAR. Published by Elsevier Ltd. All rights reserved.
References
Awe, O. Studies of nighttime Es at Ibadan near the magnetic equator. J.
Atmos. Terr. Phys. 33, 1209–1222, 1971.
Baggaley, W.J. Three solar cycles of day-time southern hemisphere Es
activity. J. Atmos. Terr. Phys. 46 (3), 207–210, 1984.
Baggaley, W.J. Changes in the frequency distribution of foEs and FbEs
over two solar cycles. Planet. Space Sci. 33 (4), 457–459, 1985a.
Baggaley, W.J. Seasonal characteristics of daytime Es occurrence in the
southern hemisphere. J. Atmos. Terr. Phys. 47 (6), 611–614, 1985b.
Baggaley, W.J. Structure in the seasonal variations of Es at southern
latitudes. J. Atmos. Terr. Phys. 48 (4), 385–391, 1986.
Chimonas, G. Enhancement of sporadic E by horizontal transport within
the layer. J. Geophys. Res. 76 (19), 4578–4586, 1971.
Closs, R.L. Low latitude sporadic E associated with geomagnetic activity.
J. Atmos. Terr. Phys. 31, 873–875, 1969.
Haldoupis, C., Pancheva, D. Planetary waves and midlatitude sporadic E
layers: strong experimental evidence for a close relationship. J.
Geophys. Res. 107 (A6), doi:10.1029/2001JA000212, 2002.
Haldoupis, C., Pancheva, D., Mitchell, N.J. A study of tidal planetary
wave periodicities present in midlatitude sporadic E layers. J. Geophys.
Res. 109, A02302, doi:10.1029/2003JA010253, 2004.
Haldoupis, C., Meek, C., Cristakis, N., Pancheva, D., Bourdillon, A.
Ionogram height-time-intensity observations of descending sporadic E
layers at mid-latitude. J. Atmos. Sol. – Terr. Phys. 68, 539–557, 2006.
Harwood, J. Some observations of the occurrence and movements of
sporadic E ionization. J. Atmos. Terr. Phys. 20, 243–262, 1961.
Houminer, Z., Russel, C.J., Dyson, P.L., Bennet, J.A. Study of sporadic-E
clouds by backscatter radar. Ann. Geophys. 14, 1060–1065, 1996.
Kotadia, K.M. Sporadic-E ionization over Ahmadabad through the half
solar cycle 1954–1957. J. Atmos. Terr. Phys. 31, 1137–1146, 1969.
Lastovicka, J. Forcing of the ionosphere by waves from below. J. Atmos.
Sol. – Terr. Phys. 68, 479–497, 2006.
Maksyutin, S.V., Sherstyukov, O.N. Dependence of E-sporadic layer
response on solar and geomagnetic activity variations from its ion
composition. Adv. Space Res. 35, 1496–1499, 2005.
Mathews, J.D. Sporadic E: current views and recent progress. J. Atmos.
Sol. – Terr. Phys. 60 (4), 413–435, 1998.
Rowe Jr., J.F. A statistical summary of Arecibo night-time E region
observations. J. Geophys. Res. 78, 6811–6817, 1973.
Sharma, S., Chandra, H. Ionospheric effects of the Leonid Meteor
Showers over Ahmedabad, 2002. Available from: <http://www.ursi.
org/Proceedings/ProcGA02/papers/p1728.pdf/>.
Szuszczewicz, E.P., Roble, R.G., Wilkinson, P.J., Hanbaba, R. Coupling
mechanisms in the lower ionospheric–thermospheric system and
manifestations in the formation and dynamics of intermediate
descending layers. J. Atmos. Terr. Phys. 57, 1483–1496, 1995.
Tanaka, T. Skywave backscatter observations of sporadic E over Japan. J.
Atmos. Terr. Phys. 41, 203–215, 1979.
Tan, Z., Huang, X., Wang, S. A preliminary investigation of ionospheric
Es-s over Wuchang, China. Journal of Atmospheric and Terrestrial
Physics 47, 959–963, 1985.
Triskova, L. On the seasonal variation in the temperate Es occurrence, J.
Atmos. Terr. Phys. 36, 861–869, 1974.
Tsunoda, R., Yamamoto, M., Igarashi, K., Hocke, K., Fukao, S. Quasi
periodic radar echoes from midlatitude sporadic E and role of the 5-
day planetary wave. Geophys. Res. Lett. 25 (7), 951–954, 1998.
Whitehead, J.D. Formation of the sporadic E layer in the temperate zones.
Nature 188, 567, 1960.
Whitehead, J.D. Production and prediction of sporadic E. Rev. Geophys.
Space Phys. 8, 65–144, 1970.
Whitehead, J.D. Recent work on mid-latitude and equatorial sporadic-E.
J. Atmos. Terr. Phys. 51 (5), 401–424, 1989.
Wilkinson, P.J., Szuszczewicz, E.P., Roble, R.G. Measurements and
modelling of intermediate, descending, and sporadic layers in the lower
ionosphere: results and implications for global-scale ionosphericthermospheric
studies. Geophys. Res. Lett. 19 (2), 95–98, 1992.
Atmos. Terr. Phys. 33, 1209–1222, 1971.
Baggaley, W.J. Three solar cycles of day-time southern hemisphere Es
activity. J. Atmos. Terr. Phys. 46 (3), 207–210, 1984.
Baggaley, W.J. Changes in the frequency distribution of foEs and FbEs
over two solar cycles. Planet. Space Sci. 33 (4), 457–459, 1985a.
Baggaley, W.J. Seasonal characteristics of daytime Es occurrence in the
southern hemisphere. J. Atmos. Terr. Phys. 47 (6), 611–614, 1985b.
Baggaley, W.J. Structure in the seasonal variations of Es at southern
latitudes. J. Atmos. Terr. Phys. 48 (4), 385–391, 1986.
Chimonas, G. Enhancement of sporadic E by horizontal transport within
the layer. J. Geophys. Res. 76 (19), 4578–4586, 1971.
Closs, R.L. Low latitude sporadic E associated with geomagnetic activity.
J. Atmos. Terr. Phys. 31, 873–875, 1969.
Haldoupis, C., Pancheva, D. Planetary waves and midlatitude sporadic E
layers: strong experimental evidence for a close relationship. J.
Geophys. Res. 107 (A6), doi:10.1029/2001JA000212, 2002.
Haldoupis, C., Pancheva, D., Mitchell, N.J. A study of tidal planetary
wave periodicities present in midlatitude sporadic E layers. J. Geophys.
Res. 109, A02302, doi:10.1029/2003JA010253, 2004.
Haldoupis, C., Meek, C., Cristakis, N., Pancheva, D., Bourdillon, A.
Ionogram height-time-intensity observations of descending sporadic E
layers at mid-latitude. J. Atmos. Sol. – Terr. Phys. 68, 539–557, 2006.
Harwood, J. Some observations of the occurrence and movements of
sporadic E ionization. J. Atmos. Terr. Phys. 20, 243–262, 1961.
Houminer, Z., Russel, C.J., Dyson, P.L., Bennet, J.A. Study of sporadic-E
clouds by backscatter radar. Ann. Geophys. 14, 1060–1065, 1996.
Kotadia, K.M. Sporadic-E ionization over Ahmadabad through the half
solar cycle 1954–1957. J. Atmos. Terr. Phys. 31, 1137–1146, 1969.
Lastovicka, J. Forcing of the ionosphere by waves from below. J. Atmos.
Sol. – Terr. Phys. 68, 479–497, 2006.
Maksyutin, S.V., Sherstyukov, O.N. Dependence of E-sporadic layer
response on solar and geomagnetic activity variations from its ion
composition. Adv. Space Res. 35, 1496–1499, 2005.
Mathews, J.D. Sporadic E: current views and recent progress. J. Atmos.
Sol. – Terr. Phys. 60 (4), 413–435, 1998.
Rowe Jr., J.F. A statistical summary of Arecibo night-time E region
observations. J. Geophys. Res. 78, 6811–6817, 1973.
Sharma, S., Chandra, H. Ionospheric effects of the Leonid Meteor
Showers over Ahmedabad, 2002. Available from: <http://www.ursi.
org/Proceedings/ProcGA02/papers/p1728.pdf/>.
Szuszczewicz, E.P., Roble, R.G., Wilkinson, P.J., Hanbaba, R. Coupling
mechanisms in the lower ionospheric–thermospheric system and
manifestations in the formation and dynamics of intermediate
descending layers. J. Atmos. Terr. Phys. 57, 1483–1496, 1995.
Tanaka, T. Skywave backscatter observations of sporadic E over Japan. J.
Atmos. Terr. Phys. 41, 203–215, 1979.
Tan, Z., Huang, X., Wang, S. A preliminary investigation of ionospheric
Es-s over Wuchang, China. Journal of Atmospheric and Terrestrial
Physics 47, 959–963, 1985.
Triskova, L. On the seasonal variation in the temperate Es occurrence, J.
Atmos. Terr. Phys. 36, 861–869, 1974.
Tsunoda, R., Yamamoto, M., Igarashi, K., Hocke, K., Fukao, S. Quasi
periodic radar echoes from midlatitude sporadic E and role of the 5-
day planetary wave. Geophys. Res. Lett. 25 (7), 951–954, 1998.
Whitehead, J.D. Formation of the sporadic E layer in the temperate zones.
Nature 188, 567, 1960.
Whitehead, J.D. Production and prediction of sporadic E. Rev. Geophys.
Space Phys. 8, 65–144, 1970.
Whitehead, J.D. Recent work on mid-latitude and equatorial sporadic-E.
J. Atmos. Terr. Phys. 51 (5), 401–424, 1989.
Wilkinson, P.J., Szuszczewicz, E.P., Roble, R.G. Measurements and
modelling of intermediate, descending, and sporadic layers in the lower
ionosphere: results and implications for global-scale ionosphericthermospheric
studies. Geophys. Res. Lett. 19 (2), 95–98, 1992.
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