GPS observations at quasi-conjugate points under disturbed conditions

Mohammad Awad Momani, Mohd Alauddin Mohd Ali, Baharudin Yatim, Mardina Abdullah, Norbahiah Misran

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The conjugacy effects of the GPS scintillation activities during the geomagnetic storms of October 2003, November 2003 and July 2004 have been investigated at the approximately geomagnetically conjugate stations: Scott Base, Antarctica (SBA) and Resolute Cornwallis Island (RESO) in the high Arctic region. The measurements aim at investigation of the similarities and differences of the scintillation activities occurring at the conjugate points in the polar regions under storm conditions and examine the relationship between the Storm Enhanced Density (SED) and scintillation activity. The measurements of the scintillation activities obtained from total scintillation index during these storm periods at both hemispheres showed asymmetry in the ionospheric scintillation occurrence at the conjugate points. Pronounced scintillation activity was observed at the nightside hemisphere with the total scintillation index higher than at the dayside hemisphere. The results also show that the durations of severe scintillation activity were longer at the nightside hemisphere. The measurements showed that the intense scintillation periods were corresponding to the presence of the SED events where more pronounced SED events were observed over the nightside hemisphere.

Original languageEnglish
Pages (from-to)1179-1201
Number of pages23
JournalActa Geophysica
Volume56
Issue number4
DOIs
Publication statusPublished - 2008

Fingerprint

conjugate points
scintillation
GPS
hemispheres
geomagnetic storm
polar region
asymmetry
Arctic regions
magnetic storms
Antarctic regions
polar regions
ionospherics
stations

Keywords

  • Geomagnetic storm
  • GPS
  • Scintillation
  • SED
  • TEC

ASJC Scopus subject areas

  • Geophysics

Cite this

GPS observations at quasi-conjugate points under disturbed conditions. / Momani, Mohammad Awad; Mohd Ali, Mohd Alauddin; Yatim, Baharudin; Abdullah, Mardina; Misran, Norbahiah.

In: Acta Geophysica, Vol. 56, No. 4, 2008, p. 1179-1201.

Research output: Contribution to journalArticle

Momani, Mohammad Awad ; Mohd Ali, Mohd Alauddin ; Yatim, Baharudin ; Abdullah, Mardina ; Misran, Norbahiah. / GPS observations at quasi-conjugate points under disturbed conditions. In: Acta Geophysica. 2008 ; Vol. 56, No. 4. pp. 1179-1201.
@article{b90a24d8bc614492a8d1defc7b3a18cc,
title = "GPS observations at quasi-conjugate points under disturbed conditions",
abstract = "The conjugacy effects of the GPS scintillation activities during the geomagnetic storms of October 2003, November 2003 and July 2004 have been investigated at the approximately geomagnetically conjugate stations: Scott Base, Antarctica (SBA) and Resolute Cornwallis Island (RESO) in the high Arctic region. The measurements aim at investigation of the similarities and differences of the scintillation activities occurring at the conjugate points in the polar regions under storm conditions and examine the relationship between the Storm Enhanced Density (SED) and scintillation activity. The measurements of the scintillation activities obtained from total scintillation index during these storm periods at both hemispheres showed asymmetry in the ionospheric scintillation occurrence at the conjugate points. Pronounced scintillation activity was observed at the nightside hemisphere with the total scintillation index higher than at the dayside hemisphere. The results also show that the durations of severe scintillation activity were longer at the nightside hemisphere. The measurements showed that the intense scintillation periods were corresponding to the presence of the SED events where more pronounced SED events were observed over the nightside hemisphere.",
keywords = "Geomagnetic storm, GPS, Scintillation, SED, TEC",
author = "Momani, {Mohammad Awad} and {Mohd Ali}, {Mohd Alauddin} and Baharudin Yatim and Mardina Abdullah and Norbahiah Misran",
year = "2008",
doi = "10.2478/s11600-008-0048-4",
language = "English",
volume = "56",
pages = "1179--1201",
journal = "Acta Geophysica",
issn = "1895-6572",
publisher = "Versita",
number = "4",

}

TY - JOUR

T1 - GPS observations at quasi-conjugate points under disturbed conditions

AU - Momani, Mohammad Awad

AU - Mohd Ali, Mohd Alauddin

AU - Yatim, Baharudin

AU - Abdullah, Mardina

AU - Misran, Norbahiah

PY - 2008

Y1 - 2008

N2 - The conjugacy effects of the GPS scintillation activities during the geomagnetic storms of October 2003, November 2003 and July 2004 have been investigated at the approximately geomagnetically conjugate stations: Scott Base, Antarctica (SBA) and Resolute Cornwallis Island (RESO) in the high Arctic region. The measurements aim at investigation of the similarities and differences of the scintillation activities occurring at the conjugate points in the polar regions under storm conditions and examine the relationship between the Storm Enhanced Density (SED) and scintillation activity. The measurements of the scintillation activities obtained from total scintillation index during these storm periods at both hemispheres showed asymmetry in the ionospheric scintillation occurrence at the conjugate points. Pronounced scintillation activity was observed at the nightside hemisphere with the total scintillation index higher than at the dayside hemisphere. The results also show that the durations of severe scintillation activity were longer at the nightside hemisphere. The measurements showed that the intense scintillation periods were corresponding to the presence of the SED events where more pronounced SED events were observed over the nightside hemisphere.

AB - The conjugacy effects of the GPS scintillation activities during the geomagnetic storms of October 2003, November 2003 and July 2004 have been investigated at the approximately geomagnetically conjugate stations: Scott Base, Antarctica (SBA) and Resolute Cornwallis Island (RESO) in the high Arctic region. The measurements aim at investigation of the similarities and differences of the scintillation activities occurring at the conjugate points in the polar regions under storm conditions and examine the relationship between the Storm Enhanced Density (SED) and scintillation activity. The measurements of the scintillation activities obtained from total scintillation index during these storm periods at both hemispheres showed asymmetry in the ionospheric scintillation occurrence at the conjugate points. Pronounced scintillation activity was observed at the nightside hemisphere with the total scintillation index higher than at the dayside hemisphere. The results also show that the durations of severe scintillation activity were longer at the nightside hemisphere. The measurements showed that the intense scintillation periods were corresponding to the presence of the SED events where more pronounced SED events were observed over the nightside hemisphere.

KW - Geomagnetic storm

KW - GPS

KW - Scintillation

KW - SED

KW - TEC

UR - http://www.scopus.com/inward/record.url?scp=53749105296&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=53749105296&partnerID=8YFLogxK

U2 - 10.2478/s11600-008-0048-4

DO - 10.2478/s11600-008-0048-4

M3 - Article

VL - 56

SP - 1179

EP - 1201

JO - Acta Geophysica

JF - Acta Geophysica

SN - 1895-6572

IS - 4

ER -