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2013
Foster, S., and S. Yousef, "Injection of scattered disc objects into the inner solar system in response to shrinkage of the heliosphere", Modern Trends in Physics. Fourth International Conference MTPR- 10, Edited by L. El Nadi, Cairo and Sharm El Sheikh Egypt, World Scientific Publishing Co. 978-981-4540-88-1, pp. 295-302, 2013. shahinaz_1.pdf
a, A. A., Y. M. b, Y. S. M. c, M. A. Y. c, R. M. G. b, and S. M. A. b a, "On the ionospheric effects of 26 June, 1999 solar flare", Elsevier B.V. on behalf of National Research Institute of Astronomy and Geophysics, vol. 1, pp. 179–185, 2013. Abstract1-s2.0-s2090997712000247-main.pdf

In this paper we traced the possible influence of the solar flare of June 26, 1999 on the
ionosphere throughout the F2-layer parameters. This study concentrated on two parameters,
foF2, the critical frequency of the ordinary component of the F2-layer; and hc, the height of the
maximum obtained by fitting a theoretical h0F curve for the parabola of best fit to the observed
ordinary mode trace near foF2 and correcting for under-lying ionization. The results showed that
the relation between the amplitude of averaged sudden enhancements of the perturbations for
the critical frequency of the ionospheric F2 region, DfoF2 (for data obtained from 8 ionosonde stations),
and the duration of the flare is more applicable to the empirical formula given by Youssef
(2008). Since we found this relation is linear and has a very strong correlation. In addition, we
found that the relation between the average amplitude, of DfoF2, for the 8 selected ionosonde stations,
and the flare flux is not a linear. For the second parameter, hc, it was found that, the hc amplitude
depends on the location of the station on the Earth, and it reaches its maximum value during
the decay phase of the studied flare.

Shehri, S. M. A., I. Sabbah, S. M. Yousef, and M. Y. Amin, "Solar Forcing On Nile And Cosmic Rays", Modern Trends in Physics. Fourth International Conference MTPR- 10, Edited by L. El Nadi, Cairo and Sharm El Sheikh Egypt, World Scientific Publishing Co. 978-981-4540-88-1, pp. 33-336, 2013. shahinaz_3.pdf
Yousef, S., and O. Ali, "Surprising rapid collapse of Sirius B from Red Giant to White Dwarf through mass transfer to Sirius A", Modern Trends in Physics. Fourth International Conference MTPR- 10, Edited by L. El Nadi, Cairo and Sharm El Sheikh Egypt, World Scientific Publishing Co. 978-981-4540-88-1, pp. 318-322, 2013. shahinaz_2.pdf
2012
Yousef, S., Y. H. O. Algafari, Z. Al-Mostafa, and M. Kordi, "Solar Forcing on Makkah Al-Mukaramah Flash Floods", Journal of Earth Sciences and Engineering., vol. 2 number2, feb serial number5, issue ISSN 2159-581X, pp. 77-83, 2012. journal_of_earth_science_and_engineeringvol1no120111.pdf
2010
Yousef, S., W. Abdel-Sattar, and S. M. Amin, "The Shrinking of the Heliosphere Due to Reduced Solar Wind", International Association of Geomagnetism and Aeronomy (IAGA), Cairo, Egypt, 4 Dec 2009, 2010. Heliosphere Oscillations.pdf
Yousef, S., and G. Ali, "Reduced Solar Wind Speed During the Period 2006-2010", IAGA2,Solar Wind-Space Environment Interaction, Cairo, Egypt, Cairo University Press, pp. 217-220, 2010. iaga2-yousef-ali.pdf
Yousef, S., and G. Ali, "Reduced Solar Wind Speed During the Period 2006-2010", IAGA2,Solar Wind-Space Environment Interaction, Cairo, Egypt, Cairo University Press, pp. 217-220, 2010. iaga2-yousef-ali.pdf
Yousef, S., and G. Ali, "Reduced Solar Wind Speed During the Period 2006-2010", IAGA2,Solar Wind-Space Environment Interaction, Cairo, Egypt, Cairo University Press, pp. 217-220, 2010. iaga2-yousef-ali.pdf
2009
Yousef, S., A. Y. E. D. A. M. AMIN, and W. Abdel-Sattar, "The Shrinking of the HeliosphereDue to Reduced Solar Wind", IAGA2,Solar Wind-Space Environment Interaction, Cairo, Egypt, December 4-8, 20, 2009. shahinaz.pdf
2007
Yousef, S., "Sub Water Volcanic Eruption As A Possible Cause Of The Great Deluge Of Noah", GRMENA I, Cairo, Egypt, pp. 241-254, 2007. noah_deluge.pdf
2006
Yousef, S., "80–120 yr Long-term solar induced effects on the earth, past and predictions", Physics and Chemistry of the Earth , vol. 31, pp. 113–122, 2006. smyousef.pdf
2001
Yousef, S., "Shock waves induced from the explosions of cosmic bodies in midair turn the sandy face of the earth into slippery glasses, a quranic prospective", Al-Azhar Bulletin of Science, 2001. bism_allah_husbanan.pdf
2000
Yousef, S., "FIVE YEARS AHEAD PREDICTION OF INDIAN DROUGHTS; A TRIUMPH FOR SOLAR TERESTRIAL RELATIONS", ICEHM2000,Proceedings of the International Conference on the Environmental Hazards Mitigation, Cairo University- Egypt, Conferences of Virtual Academia, www.virtuacademia.com/conferences., pp. 201- 208, 2000. cli201_208.pdf
Yousef, S., "FIVE YEARS AHEAD PREDICTION OF INDIAN DROUGHTS; A TRIUMPH FOR SOLAR TERESTRIAL RELATIONS", ICEHM2000,Proceedings of the International Conference on the Environmental Hazards Mitigation, Cairo University- Egypt, Conferences of Virtual Academia, www.virtuacademia.com/conferences., pp. 201- 208, 2000. cli201_208.pdf
1999
Yousef, S. M. A., "The 1st of April 2470 BC Total Solar Eclipse Seen by The Prophet Ibraheem", . Nato Advances In Solar Research At Eclipses From Ground And From Space. Romanian Astronomical Journal, vol. 9 supplement, pp. 73-41, 1999. malakoot_assamawat.pdf
1994
Yousef, S., and M. Kamal, HAD ALEXANDER ZOL--QUARNAIN REACHED THE ARCTIC CIRCLE, , 1995, 1994. had_alexander_zol_qurnian_mostafa.pdf
Yousef, S., and E. M. Raey, "Major Solar Episodes Reconstructed Using Records Of the river Nile , Tree-Ring Indices and Sunspot", De L’ Institut D’ Egypte., vol. Tomes LXXIV, pp. 76-108, 1994. nile_arab_epoch_pp_77-941.docsecond_part_95-108.doc
Yousef, S., and E. M. Raey, "Major Solar Episodes Reconstructed Using Records Of the river Nile , Tree-Ring Indices and Sunspot", De L’ Institut D’ Egypte., vol. Tomes LXXIV, pp. 76-108, 1994. nile_arab_epoch_ part 1 pp_77-94.docnile_arab_epoch_pp_77-941.doc
1981
Ahmed, Y. S., and A. A., "Medieval Islamic Astronomical Terminology", Journal of the astronomical society of Egypt, vol. III, pp. 13-30, 1981. document1.pdf
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