prayitno Abadi

LAPAN, Ionospheric Physics, Undergraduate

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Yavor Shopov

Sofia University "St. Kliment Ohridski"

Emine Ceren Kalafatoglu Eyigüler

Istanbul Technical University

Venkateswara Rao Narukull

Kyoto University

Sebastian Remmler

TUM

Erdal Yiğit

George Mason University

Eliana Nossa

U.S. Naval Research Laboratory

Rizal suryana

LAPAN

Asnawi Husin

LAPAN

Subarna Mondal

Physical Research Laboratory

Armando Marques-Guedes

UNL - New University of Lisbon

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Papers by prayitno Abadi

Role of the evening eastward electric field and the seed perturbations in the sequential occurrence of plasma bubble

Relationship between Latitudinal Extension of Scintillation and Pre-reversal Enhancement in the Southeast Asian Region

We have investigated the relationship between the maximum latitude extension of observed scintill... more We have investigated the relationship between the maximum latitude extension of observed scintillations (Lmax) and the maximum altitude of the equatorial F-region bottomside (h’Fmax), peak of eastward electric field (Emax), and time duration of eastward electric field (TE) during PRE period in the equatorial region. We used three GPS receivers installed in Kototabang (0.2S, 100.3E; 10.0N magnetic latitude), Pontianak (0.02S, 109.3E; 8.9S magnetic latitude), and Bandung (6.9S, 107.6E; 17.5S magnetic latitude), Indonesia for observing scintillation activity in period 18.00-22.00 LT (LT=UT+7h) and two frequency modulated-continues wave (FM-CW) ionosondes installed near equator magnetic, Chumphon (10.7N, 99.4E; 3.3N magnetic latitude), Thailand and Bac Lieu (9.3N, 105.7E; 1.7N magnetic latitude), Vietnam for measuring PRE parameters, such as h’F, vertical drift (dh’F/dt) which indicates eastward electric field, and TE. Our observation period is during equinox months (March, April, Septe...

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Design of Sliding Correlator Channel Sounder for Ionospheric Channel Probing Based on Software Define Radio

Observation of wireless channel using channel sounder method is needed in order to obtain the cha... more Observation of wireless channel using channel sounder method is needed in order to obtain the channel characteristics in the form of delay spread (T m ) and doppler spread ( f D ) parameters for optimizing the design of digital communication systems. This also applies to the ionosphere channels which are known to have dynamic properties in the time and place domains. The Sliding Correlator Channel Sounder technique known as a popular technique due to the advantage in the low level of complexity and relatively low cost. Similar to the advantages of the sliding correlator technique, Software Define Radio (SDR) device is one of the popular inexpensive platforms for implementing the communication system into the real world. The implementation of the sliding correlator channel sounder technique in the SDR platform will increase the advantages of the ionosphere channel measurement system that needed as an effort to obtain the dynamic of ionospheric channel characteristic information. Howe...

Relationship between Latitudinal Extension of Scintillation and Strength of PRE (Pre-reversal Enhancement) in the Southeast Asian Region

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Equinoctial asymmetry in the east-west distribution of scintillation occurrence observed by GPS receivers in Indonesia

Role of the pre-reversal enhancement and medium-scale gravity waves on multiple plasma bubbles occurrence

Japan Geoscience Union, 2018

Effects of the St . Patrick ' s Day storm on the ionospheric irregularities formation over 1 South East Asia 2

29 We investigate the geospace response to the 2015 St. Patrick's Day storm leveraging on 30 ... more 29 We investigate the geospace response to the 2015 St. Patrick's Day storm leveraging on 30 instruments spread over South East Asia (SEA), covering a wide longitudinal sector of the low 31 latitude ionosphere. A regional characterization of the storm is provided, identifying the 32 peculiarities of ionospheric irregularities formation. The novelties of this work are the 33 characterization in a broad longitudinal range and the methodology relying on the integration of 34 data acquired by GNSS receivers, magnetometers, ionosondes and Swarm satellites. This work is 35 a legacy of the project ERICA (EquatoRial Ionosphere Characterization in Asia). ERICA aimed 36 to capture the features of both crests of the Equatorial Ionospheric Anomaly (EIA) and Trough 37 (EIT) by means of a dedicated measurement campaign. The campaign lasted from March to 38 October 2015 and was able to observe the ionospheric variability causing effects on radio 39 systems, GNSS in particular. The multi-instru...

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Verification of Himawari-8 Observation Data using Cloud Optical Thickness (COT) and Cloud Image Energy

International Journal of Advanced Computer Science and Applications

Himawari-8 satellite cloud observation data covers all areas of Indonesia. The cloud observation ... more Himawari-8 satellite cloud observation data covers all areas of Indonesia. The cloud observation data can be used for observations of current weather conditions and short-term predictions. This paper reports the verification method of Himawari-8 Observation Data using Cloud Optical Thickness (COT) and compared to Cloud Image Energy. The verification test was carried out to determine the accuracy of Himawari-8's observations. COT data were verified using energy data from the observation image of the time-lapse camera. First, the time-lapse camera captures and classifies the cloud image. Subsequently, the energy of each image frame was calculated and regrouped the result based on the energy to determine the type of the cloud. The results show that there is a positive correlation between COT and low energy values with cumulonimbus cloud detection, on the contrary for Cirrus-cloud type. However, the data requires a more accurate observation method to obtain data from cloud images on the Himawari-8 satellite, specifically for regions with a small spatial size of 4 km and thin clouds in the lower layer.

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On the Seeding of Periodic Equatorial Plasma Bubbles by Gravity Waves Associated With Tropical Cyclone: A Case Study

Journal of Geophysical Research: Space Physics

Challenges to Equatorial Plasma Bubble and Ionospheric Scintillation Short-Term Forecasting and Future Aspects in East and Southeast Asia

Surveys in Geophysics

Equatorial plasma bubbles (EPBs) can cause rapid fluctuations in amplitude and phase of radio sig... more Equatorial plasma bubbles (EPBs) can cause rapid fluctuations in amplitude and phase of radio signals traversing the ionosphere and in turn produce serious ionospheric scintillations and disrupt satellite-based communication links. Whereas numerous studies on the generation and evolution of EPBs have been performed, the prediction of EPB and ionospheric scintillation occurrences still remains unresolved. The generalized Rayleigh–Taylor (R–T) instability has been widely accepted as the physical mechanism responsible for the generation of EPBs. But how the factors, which seed the development of R–T instability and control the dynamics of EPBs and resultant ionospheric scintillations, change on a short-term basis are not clear. In the East and Southeast Asia, there exist significant differences in the generation rates of EPBs at closely located stations, for example, Kototabang (0.2°S, 100.3°E) and Sanya (18.3°N, 109.6°E), indicating that the decorrelation distance of EPB generation is small (hundreds of kilometers) in longitude. In contrast, after the initial generation of EPBs at one longitude, they can drift zonally more than 2000 km and extend from the magnetic equator to middle latitudes of 40° or higher under some conditions. These features make it difficult to identify the possible seeding sources for the EPBs and to accurately predict their occurrence, especially when the onset locations of EPBs are far outside the observation sector. This paper presents a review on the current knowledge of EPBs and ionospheric scintillations in the East and Southeast Asia, including their generation mechanism and occurrence morphology, and discusses some unresolved issues related to their short-term forecasting, including (1) what factors control the generation of EPBs, its day-to-day variability and storm-time behavior, (2) what factors control the evolution and lifetime of EPBs, and (3) how to accurately determine ionospheric scintillation from EPB measurements. Special focus is given to the whole process of the EPB generation, development and disruption. The current observing capabilities, future new facilities and campaign observations in the East and Southeast Asia in helping to better understand the short-term variability of EPBs and ionospheric scintillations are outlined.

Probability of ionospheric plasma bubble occurrence as a function of pre-reversal enhancement deduced from ionosondes in Southeast Asia

PROCEEDINGS OF THE 3RD INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2019): Exploring New Innovation in Metallurgy and Materials

Investigation of the latitudinal occurrence rate of ionospheric plasma bubble in case of strong and weak pre–reversal enhancement in Southeast Asia

Journal of Physics: Conference Series

We used ionosonde and GPS receivers during March–April in 2004–2005 and 2011–2015 to investigate ... more We used ionosonde and GPS receivers during March–April in 2004–2005 and 2011–2015 to investigate the latitudinal variation of equatorial plasma bubble (EPB) occurrence rate in cases of strong and weak pre-reversal enhancement (PRE). The ionosonde at Chumphon in Thailand was used to estimate the PRE strength. Ten GPS receivers in Southeast Asia, ranging from magnetic latitude (ML) of 4.4°S to 21.6°S, were used to investigate the latitudinal variation of EPB occurrence rate. In the case of strong PRE, the EPB occurrence rates decrease from 38.9% to 34.9% at ML of 4.4°S–7.2°S. Continuously, the occurrence rate increases and reaches the peak (44%) at ML of 9.3°S; afterward, the occurrence rate rapidly decreases and reaches below 5% at ML of 21.6°S. In the case of weak PRE, the occurrence rate decreases from 21.8% at ML of 4.4°S, seems constant (15.3%–16%) at ML of 8.2°S–12.1°S, and reaches less than 5% at ML of 16.1°S. Generally, the EPB occurrence rate and its latitudinal extension in ...

Ionosphere Monitoring in South East Asia in the ERICA Study

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Formation of ionospheric irregularities over South East Asia during the St. Patrick's Day storm

Journal of Geophysical Research: Space Physics, 2016

We investigate the geospace response to the 2015 St. Patrickˈs Day storm leveraging on instrument... more We investigate the geospace response to the 2015 St. Patrickˈs Day storm leveraging on instruments spread over Southeast Asia (SEA), covering a wide longitudinal sector of the low-latitude ionosphere. A regional characterization of the storm is provided, identifying the peculiarities of ionospheric irregularity formation. The novelties of this work are the characterization in a broad longitudinal range and the methodology relying on the integration of data acquired by Global Navigation Satellite System (GNSS) receivers, magnetometers, ionosondes, and Swarm satellites. This work is a legacy of the project EquatoRial Ionosphere Characterization in Asia (ERICA). ERICA aimed to capture the features of both crests of the equatorial ionospheric anomaly (EIA) and trough (EIT) by means of a dedicated measurement campaign. The campaign lasted from March to October 2015 and was able to observe the ionospheric variability causing effects on radio systems, GNSS in particular. The multiinstrumental and multiparametric observations of the region enabled an in-depth investigation of the response to the largest geomagnetic storm of the current solar cycle in a region scarcely reported in literature. Our work discusses the comparison between northern and southern crests of the EIA in the SEA region. The observations recorded positive and negative ionospheric storms, spread F conditions, scintillation enhancement and inhibition, and total electron content variability. The ancillary information on the local magnetic field highlights the variety of ionospheric perturbations during the different storm phases. The combined use of ionospheric bottomside, topside, and integrated information points out how the storm affects the F layer altitude and the consequent enhancement/suppression of scintillations.

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Ionosphere monitoring in South East Asia: Activities in GINESTRA and ERICA projects

2015 International Association of Institutes of Navigation World Congress (IAIN), 2015

GINESTRA and ERICA are two projects funded in the framework of the ALCANTARA Initiative of the Eu... more GINESTRA and ERICA are two projects funded in the framework of the ALCANTARA Initiative of the European Space Agency. GINESTRA is a survey which aims to explore the capabilities of ionosphere monitoring in South East Asia to identify both institutions involved in this field and existing monitoring facilities. ERICA exploits the GINESTRA outcomes and aims to characterize the ionospheric variability of the Equatorial Ionospheric Anomaly in the region, in particular the variation of the plasma electron density in the southern and northern crests of the anomaly and over the dip equator identified by the Equatorial Ionospheric Trough. To achieve this goal, an ad hoc measurements campaign is conducted with ground-based instruments located in the footprints of the Equatorial Ionospheric Anomaly and of the Equatorial Ionospheric Trough in Vietnam and Indonesia. The paper presents the outcomes of GINESTRA and highlights some preliminary results of the data analysis conducted so far in the framework of ERICA.

Enhanced ionospheric plasma bubble generation in more active ITCZ

A close link between the atmospheric Intertropical Convergence Zone (ITCZ) and ionospheric plasma... more A close link between the atmospheric Intertropical Convergence Zone (ITCZ) and ionospheric plasma bubble has been proposed since the last century. But this relationship has often appeared to be less than convincing due to the simultaneous roles played by several other factors in shaping the global distribution of ionospheric bubbles. From simultaneous collaborative radar multibeam steering measurements at Kototabang (0.2°S, 100.3°E) and Sanya (18.4°N, 109.6°E), conducted during September–October of 2012 and 2013, we find that the total numbers of nights with bubble (i.e., occurrence rates) at the two closely located longitudes (Kototabang and Sanya) are comparable. But interestingly, the total number of nights with locally generated bubble (i.e., generation rate) over Kototabang is clearly more than that over Sanya. Further analysis reveals that a more active ITCZ is situated around the longitude of Kototabang. We surmise that the enhanced ionospheric bubble generation at Kototabang...

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Equinoctial asymmetry in the zonal distribution of scintillation as observed by GPS receivers in Indonesia

Journal of Geophysical Research: Space Physics

We investigate the azimuthal distribution of amplitude scintillation observed by Global Positioni... more We investigate the azimuthal distribution of amplitude scintillation observed by Global Positioning System (GPS) ground receivers at Pontianak (0.0°S, 109.3°E; Mag. Lat.: 9.8°S) and Bandung (6.9°S, 107.6°E; Mag. Lat.: 16.7°S) in Indonesia in March and September from 2011 to 2015. The scintillation is found to occur more to the west than to the east in March at both stations, whereas no such zonal difference is found in September. We also analyze the zonal scintillation drift as estimated using three closely spaced single-frequency GPS receivers at Kototabang (0.2°S, 100.3°E; Mag. Lat.: 9.9°S) in Indonesia during 2003–2015, and the zonal thermospheric neutral wind as measured by the CHAMP satellite at longitudes of 90°–120°E during 2001–2008. We find that the velocities of both the zonal scintillation drift and the neutral wind decrease with increasing latitudes. Interestingly, the latitudinal gradients of both the zonal scintillation drift and the neutral wind are steeper in March than in September. These steeper March gradients may be responsible for the increased westward altitudinal and latitudinal tilting of plasma bubbles in March. This equinoctial asymmetry could be responsible for the observed westward bias in scintillation in March, because the scintillation is more likely to occur when radio waves pass through longer lengths of plasma irregularities in the plasma bubbles.

PENGARUH MEDAN MAGNET TERHADAP SUDUT POLARISASI SINAR LASER PADA AIR DAN LARUTAN NaCl (Influence of Magnetic Field Toward Polarization …

Had been done experiment about influence of external magnetic field toward polarization angle of ... more Had been done experiment about influence of external magnetic field toward polarization angle of laser ray to NaCl various concentration 5%,10%,15%,20%,25%,30%,35% and water. Optical characteristic behaviors studied in this research were vibration direction rotation of electric fields β β β β from

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PERBANDINGAN ANTARA MODEL TEC REGIONAL INDONESIA NEAR-REAL TIME DAN MODEL TEC GIM (GLOBAL IONOSPHERIC MAP) BERDASARKAN …

Majalah Sains dan Teknologi Dirgantara, Jan 1, 2010

... (Prayitno Abadi) 43 ... Peta TEC kedua model dapat dilihat di Lampiran 1 dan 2. Perbandingan ... more

STUDI PUSTAKA PERUBAHAN KERAPATAN ELEKTRON LAPISAN D IONOSFER MENGGUNAKAN PENGAMATAN AMPLITUDO SINYAL VLF

Berita Dirgantara, Jan 1, 2010

Studi pustaka perubahan kerapatan elektron lapisan D ionosfer akibat peningkatan emisi flare sina... more

Role of the evening eastward electric field and the seed perturbations in the sequential occurrence of plasma bubble

Relationship between Latitudinal Extension of Scintillation and Pre-reversal Enhancement in the Southeast Asian Region

Download

Design of Sliding Correlator Channel Sounder for Ionospheric Channel Probing Based on Software Define Radio

Relationship between Latitudinal Extension of Scintillation and Strength of PRE (Pre-reversal Enhancement) in the Southeast Asian Region

Download

Equinoctial asymmetry in the east-west distribution of scintillation occurrence observed by GPS receivers in Indonesia

Role of the pre-reversal enhancement and medium-scale gravity waves on multiple plasma bubbles occurrence

Japan Geoscience Union, 2018

Effects of the St . Patrick ' s Day storm on the ionospheric irregularities formation over 1 South East Asia 2

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Verification of Himawari-8 Observation Data using Cloud Optical Thickness (COT) and Cloud Image Energy

International Journal of Advanced Computer Science and Applications

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On the Seeding of Periodic Equatorial Plasma Bubbles by Gravity Waves Associated With Tropical Cyclone: A Case Study

Journal of Geophysical Research: Space Physics

Challenges to Equatorial Plasma Bubble and Ionospheric Scintillation Short-Term Forecasting and Future Aspects in East and Southeast Asia

Surveys in Geophysics

Probability of ionospheric plasma bubble occurrence as a function of pre-reversal enhancement deduced from ionosondes in Southeast Asia

PROCEEDINGS OF THE 3RD INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2019): Exploring New Innovation in Metallurgy and Materials

Investigation of the latitudinal occurrence rate of ionospheric plasma bubble in case of strong and weak pre–reversal enhancement in Southeast Asia

Journal of Physics: Conference Series

Ionosphere Monitoring in South East Asia in the ERICA Study

Navigation

Formation of ionospheric irregularities over South East Asia during the St. Patrick's Day storm

Journal of Geophysical Research: Space Physics, 2016

Download

Ionosphere monitoring in South East Asia: Activities in GINESTRA and ERICA projects

2015 International Association of Institutes of Navigation World Congress (IAIN), 2015

Enhanced ionospheric plasma bubble generation in more active ITCZ

Download

Equinoctial asymmetry in the zonal distribution of scintillation as observed by GPS receivers in Indonesia

Journal of Geophysical Research: Space Physics

PENGARUH MEDAN MAGNET TERHADAP SUDUT POLARISASI SINAR LASER PADA AIR DAN LARUTAN NaCl (Influence of Magnetic Field Toward Polarization …

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PERBANDINGAN ANTARA MODEL TEC REGIONAL INDONESIA NEAR-REAL TIME DAN MODEL TEC GIM (GLOBAL IONOSPHERIC MAP) BERDASARKAN …

Majalah Sains dan Teknologi Dirgantara, Jan 1, 2010

... (Prayitno Abadi) 43 ... Peta TEC kedua model dapat dilihat di Lampiran 1 dan 2. Perbandingan ... more

STUDI PUSTAKA PERUBAHAN KERAPATAN ELEKTRON LAPISAN D IONOSFER MENGGUNAKAN PENGAMATAN AMPLITUDO SINYAL VLF

Berita Dirgantara, Jan 1, 2010

Studi pustaka perubahan kerapatan elektron lapisan D ionosfer akibat peningkatan emisi flare sina... more

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