ANALISIS PERBANDINGAN ANOMALI FREKUENSI KRITIS LAPISAN ES DAN F2 IONOSFIR YANG MERUPAKAN PREKURSOR GEMPA ACEH PADA TANGGAL 07 APRIL 2010

Authors

  • Desi Indriani Jurusan Fisika, FMIPA, Universitas Andalas
  • Dwi Pujiastuti Jurusan Fisika, FMIPA, Universitas Andalas
  • Ednofri - Lembaga Penerbangan dan Antariksa Nasional (LAPAN), Palupuh, Sumatera Barat

DOI:

https://doi.org/10.25077/jfu.4.3.%25p.2015

Abstract

ABSTRAK

Telah dilakukan analisis kualitatif untuk melihat perbandingan anomali frekuensi kritis lapisan Es dan F2 ionosfir saat terjadinya gempa Aceh pada tanggal 07 April 2010.Data ionosfir yang digunakan berasal dari hasil rekaman ionosonda FMCW, LAPAN Kototabang, Sumatera Barat berupa ionogram pada tanggal 24 Maret – 14 April 2010. Proses scaling ionogram dilakukan terlebih dahulu untuk mendapatkan nilai harian fo pada masing-masing lapisan.  Dari hasil scaling didapatkan nilai median untuk menentukan nilai batas atas dan batas bawah.  Prekursor akan terlihat apabila nilai median melebihi batas atas atau batas bawah.  Hasil penelitian menunjukkan bahwa prekursor mulai muncul pada 14 hari sebelum gempa pada lapisan foF2. Total kemunculan prekursor pada lapisan foEs adalah 4 kali dan pada lapisan foF2 sebanyak 8 kali. Dari analisis yang telah dilakukan, terdapat ketidaksamaan respon yang terjadi pada masing-masing lapisan ionosfir. Penyebab terjadinya ketidaksamaan respon diduga karena jarak masing-masing lapisan ionosfir terhadap matahari berbeda sehingga radioaktifitas yang dihasilkan juga berbeda.

Kata kunci : frekuensi kritis, ionosfir, prekursor gempa.

Abstract

A qualitative analysis has been conducted to compare the anomaly of critical frequency of Es and F2 layer of ionospheric during Aceh earthquake on April 7th, 2010. The records of ionosonda FMCW of LAPAN Kototabang West Sumatra was used as ionospheric data in ionogram form. The scalling process of ionogram was done in advance to get the daily point of fo for each layer.  From scaling founded median to determine up boundary and down boundary. When the median bigger than up boundary or down boundary, precursor will be seen. Resault show that the precursor firstly appear at 14 days before the earthquake on layer foF2. Total appearence of precursor on layer foEs is 4 times and on layer foF2 is 8 times. Based on the analysis, it was found that inequality response was happened in each layer of ionosphere. Expectedly, the cause of inequality response was happened because of the distance differences for each ionosphere layer to the sun so resulted different radioactivity.

Keywords: critical frequency, ionosphere, earthquake precursors.

Downloads

Published

2024-10-26

How to Cite

Indriani, D., Pujiastuti, D., & -, E. (2024). ANALISIS PERBANDINGAN ANOMALI FREKUENSI KRITIS LAPISAN ES DAN F2 IONOSFIR YANG MERUPAKAN PREKURSOR GEMPA ACEH PADA TANGGAL 07 APRIL 2010. Jurnal Fisika Unand, 4(3). https://doi.org/10.25077/jfu.4.3.%p.2015

Issue

Vol. 4 No. 3: Juli 2015

Section

Articles

License

Copyright (c) 2024 Desi Indriani, Dwi Pujiastuti, Ednofri -

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Please find the rights and licenses in JFU (Jurnal Fisika Unand).

1. License

The non-commercial use of the article will be governed by the Creative Commons Attribution license as currently displayed on Creative Commons Attribution-NonCommercial 4.0 International License.

2. Authors Warranties

The author warrants that the article is original, written by stated author(s), has not been published before, contains no unlawful statements, does not infringe the rights of others, is subject to copyright that is vested exclusively in the author and free of any third party rights, and that any necessary written permissions to quote from other sources have been obtained by the author(s).

3. User Rights

JFU's spirit is to disseminate articles published are as free as possible. Under the Creative Commons license, JFU permits users to copy, distribute, display, and perform the work for non-commercial purposes only. Users will also need to attribute authors and JFU on distributing works in the journal.

4. Rights of Authors

Authors retain the following rights:

  • Copyright, and other proprietary rights relating to the article, such as patent rights,
  • The right to use the substance of the article in future own works, including lectures and books,
  • The right to reproduce the article for own purposes, provided the copies are not offered for sale,
  • The right to self-archive the article.

5. Co-Authorship

If the article was jointly prepared by other authors, the signatory of this form warrants that he/she has been authorized by all co-authors to sign this agreement on their behalf, and agrees to inform his/her co-authors of the terms of this agreement.

6. Termination

This agreement can be terminated by the author or JFU upon two months notice where the other party has materially breached this agreement and failed to remedy such breach within a month of being given the terminating partys notice requesting such breach to be remedied. No breach or violation of this agreement will cause this agreement or any license granted in it to terminate automatically or affect the definition of JFU.

7. Royalties

This agreement entitles the author to no royalties or other fees. To such extent as legally permissible, the author waives his or her right to collect royalties relative to the article in respect of any use of the article by JFU or its sublicensee.

8. Miscellaneous

JFU will publish the article (or have it published) in the journal if the articles editorial process is successfully completed and JFU or its sublicensee has become obligated to have the article published. JFU may conform the article to a style of punctuation, spelling, capitalization, referencing and usage that it deems appropriate. The author acknowledges that the article may be published so that it will be publicly accessible and such access will be free of charge for the readers.