Abstract
The ionosphere is the topside of the atmosphere that contains high concentration of ions and can reflect radio waves due to refraction. The ionospheric region of interest is located above the equatorial region at longitude 1° 52' and latitude 103° 48' (Parit Raja, Johor). The observations of the ionospheric critical frequency were made from 2005 to 2007. The critical frequency is determined by using the monthly median value for each day. Regression analysis was used on the theoretical and observed value. The observed value is obtained from ionogram measurements with five-minute intervals using logarithmic frequency steps from 1 Mhz to 20 Mhz. The sunspot number is used as a parameter to compare the values of critical frequency at high sunspot and low sunspot numbers for the day. The foF2 critical frequency for 2005, 2006 and 2007 show that the higher value is for 2005, 11 MHz while the critical frequency is much lower for 2006 and 2007, 9.7 MHz and 8.95 MHz. The correlation analysis was used to determine the relationship for the yearly value. The correlation was made using the median value of the foF2 critical frequency from 2005 until 2007. The regression and correlation analysis of the critical frequency was able to show the trend of the critical frequency for 2005, R 2 = 0.031, 2006, R2 = 0.112 and 2007, R2 = 0.017.
| Original language | English |
|---|---|
| Title of host publication | 2009 International Conference on Space Science and Communication, IconSpace - Proceedings |
| Pages | 137-141 |
| Number of pages | 5 |
| DOIs | |
| Publication status | Published - 10 Dec 2009 |
| Externally published | Yes |
| Event | 2009 International Conference on Space Science and Communication, IconSpace - Port Dickson, Negeri Sembilan Duration: 26 Oct 2009 → 27 Oct 2009 |
Other
| Other | 2009 International Conference on Space Science and Communication, IconSpace |
|---|---|
| City | Port Dickson, Negeri Sembilan |
| Period | 26/10/09 → 27/10/09 |
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Keywords
- Critical frequency
- Equatorial region
- Ionosphere
- Solar minimum
ASJC Scopus subject areas
- Computer Networks and Communications
- Aerospace Engineering
- Electrical and Electronic Engineering
- Communication
Cite this
Comparison between the foF1 and foF2 critical freqeuncy in equatorial region of Malaysia. / Sabirin, Abdullah; Zain, Ahmad Faizal Mohd.
2009 International Conference on Space Science and Communication, IconSpace - Proceedings. 2009. p. 137-141 5352651.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Comparison between the foF1 and foF2 critical freqeuncy in equatorial region of Malaysia
AU - Sabirin, Abdullah
AU - Zain, Ahmad Faizal Mohd
PY - 2009/12/10
Y1 - 2009/12/10
N2 - The ionosphere is the topside of the atmosphere that contains high concentration of ions and can reflect radio waves due to refraction. The ionospheric region of interest is located above the equatorial region at longitude 1° 52' and latitude 103° 48' (Parit Raja, Johor). The observations of the ionospheric critical frequency were made from 2005 to 2007. The critical frequency is determined by using the monthly median value for each day. Regression analysis was used on the theoretical and observed value. The observed value is obtained from ionogram measurements with five-minute intervals using logarithmic frequency steps from 1 Mhz to 20 Mhz. The sunspot number is used as a parameter to compare the values of critical frequency at high sunspot and low sunspot numbers for the day. The foF2 critical frequency for 2005, 2006 and 2007 show that the higher value is for 2005, 11 MHz while the critical frequency is much lower for 2006 and 2007, 9.7 MHz and 8.95 MHz. The correlation analysis was used to determine the relationship for the yearly value. The correlation was made using the median value of the foF2 critical frequency from 2005 until 2007. The regression and correlation analysis of the critical frequency was able to show the trend of the critical frequency for 2005, R 2 = 0.031, 2006, R2 = 0.112 and 2007, R2 = 0.017.
AB - The ionosphere is the topside of the atmosphere that contains high concentration of ions and can reflect radio waves due to refraction. The ionospheric region of interest is located above the equatorial region at longitude 1° 52' and latitude 103° 48' (Parit Raja, Johor). The observations of the ionospheric critical frequency were made from 2005 to 2007. The critical frequency is determined by using the monthly median value for each day. Regression analysis was used on the theoretical and observed value. The observed value is obtained from ionogram measurements with five-minute intervals using logarithmic frequency steps from 1 Mhz to 20 Mhz. The sunspot number is used as a parameter to compare the values of critical frequency at high sunspot and low sunspot numbers for the day. The foF2 critical frequency for 2005, 2006 and 2007 show that the higher value is for 2005, 11 MHz while the critical frequency is much lower for 2006 and 2007, 9.7 MHz and 8.95 MHz. The correlation analysis was used to determine the relationship for the yearly value. The correlation was made using the median value of the foF2 critical frequency from 2005 until 2007. The regression and correlation analysis of the critical frequency was able to show the trend of the critical frequency for 2005, R 2 = 0.031, 2006, R2 = 0.112 and 2007, R2 = 0.017.
KW - Critical frequency
KW - Equatorial region
KW - Ionosphere
KW - Solar minimum
UR - http://www.scopus.com/inward/record.url?scp=76249131519&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=76249131519&partnerID=8YFLogxK
U2 - 10.1109/ICONSPACE.2009.5352651
DO - 10.1109/ICONSPACE.2009.5352651
M3 - Conference contribution
AN - SCOPUS:76249131519
SN - 9781424449569
SP - 137
EP - 141
BT - 2009 International Conference on Space Science and Communication, IconSpace - Proceedings
ER -